M28331-3x - Mindspeed Technologies

Single/Dual/Triple E3/DS3/STS-1

Line Interface Unit

Data Sheet

M28331/M28332/M28333 (–3x)

28333-DSH-003-A

March 2003

Infor mation in this document is provided in connection with Mindspeed Technologies (“Mindspeed”) products. These materials are provided by

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omissions in these materials. Mindspeed may make changes to specifications and product descriptions at any time, without notice. Mindspeed

makes no commitment to update the information and shall have no responsibility whatsoev er for conflicts or incompatibilities arising from future

changes to its specifications and product descriptions.

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For additional disclaimer information, please consult Mindspeed Technologies Legal Information posted at www.mindspeed.com which is

incorporated by reference.

28333-DSH-003-A Mindspeed Technologies™

Revision History

Revision Level Date Description

A — June 2001 Initial release

A — February 2003 - Updated LBO to 450 feet.

- Incorporated Errata # 500377A.

- Added loopback diagrams.

- Removed EVM, IBIS, and JAT Appendices.

- Fixed description of transmit AIS during

loopback operations.

- Renumbered document [28333-DSH-003-A].

- Updated PCB design considerations.

- Added power sequencing information.

- General corrections.

28333-DSH-003-A Mindspeed Technologies™iii

M28331/M28332/M28333 (–3x)

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

The M28333 is a three-channel, DS3/E3/STS-1, fully integrated Line Interface Unit

(LIU) device. It is configured via external pins and does not require a microprocessor

interface. Each channel has an independent receive equalizer requiring no user

configuration. Additionally, each channel has a programmable transmit pulse shaper

that can be set to ensure that the transmit pulse meets the pulse mask requirement

for the digital cross-connect. The M28332 is a dual-channel, and the M28331 is a

single-channel LIU with performance identical to the M28333.

The M28333 gives the user new economies of scale in concentrator applications

where three DS3 or STS-1 channels are concentrated into a single STS-3 channel.

Each line interface is reduced to 1:1 coupling transformers, terminating resistors, and

a capacitor. The Transmit Line Driver Monitor checks for a faulty transmitter or

shorted output.

NOTE: In this document, “i” is used to represent the number of channels:

i = 1 (M28331), i = 2 (M28332), and i = 3 (M28333).

Functional Block Diagram

TPOS

TNEG

TCLK ENCODER

TAIS

Pulse

Shaper

E3MODE

LINE

DRIVER

PDB

DATA

MUX

RLOOP

ENDECDIS

LLOOP

LBO

XOE

TLINEP

TLINEM/N

DECODER

RPOS

RNEG

RCLK

RLOS

TCLK

Clock/

Data

Recovery

PDATA

PDATA/

NDATA

DATCLK

NReceiver

Monitor

ALOS

RLINEP

RLINEM/N

TMONP

TMONM

TXMON

TMONTST

REFCLK

REQH

Channel 1

Channel 2

Channel 3

RLOSMDIS

RLOSTHR

RLOSMAX

Distinguishing Features

•Programmable pulse shaper to meet

cross-connect pulse masks (ANSI T1.102-

1993)

•Meets jitter tolerance and jitter generation

specifications of Bellcore GR499, GR253,

and ETSI TBR24

•Alarms for coding violation and loss of

signal

•Full diagnostic loopback capability

•Uses a minimum of external components

•Compliant with ITU-T G.703 and ETSI

TBR24

•Independent power down mode per

channel

•Easily interfaced to the DS3/E3 Framer IC

(CX28342/3/4/6/8 and CN8330)

•Selectable B3ZS/HDB3 encoding/

decoding

•Transmit monitor inputs

•Programmable RLOS threshold

Physical Characteristics

•100-pin ETQFP package

•Single 3.3 V power supply

•1 W maximum power dissipation

(M28333)

•- 40 °C to +85 °C temperature range

•5 V-tolerant pins

•TTL digital pins

Applications

•Digital Cross-Connect Systems

•Routers

•ATM Switches

•Channelized Line Aggregation Units

•Test Equipment

•Channel Service Units

•Multiplexers

iv Mindspeed Technologies ™28333-DSH-003-A

M28333 EVM

Ordering Information

Model Number Package Description Operating Temperature

M28331-3x 100-Pin ETQFP Single channel with Transmit Monitoring –40 °C to +85 °C

M28332-3x 100-Pin ETQFP Dual channel with Transmit Monitoring –40 °C to +85 °C

M28333-3x 100-Pin ETQFP Triple channel with Transmit Monitoring –40 °C to +85 °C

CH2

CH3

M28333

NRZTX DATA and CLK in

Loss of Signal

Code Violation

Clock Input

Control

TX B3ZS/HDB3 analog out

RX B3ZS/HDB3 analog in

NRZRX DATA and CLK out

NRZTX DATA and CLK in

NRZRX DATA and CLK out

NRZTX DATA and CLK in

NRZRX DATA and CLK out

CH1

CH2

CH3

CH1

TX B3ZS/HDB3 analog out

RX B3ZS/HDB3 analog in

TX B3ZS/HDB3 analog out

RX B3ZS/HDB3 analog in

100985_002

28333-DSH-003-A Mindspeed Technologies™v
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
List of Figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  vii
List of Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
0 Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
1 Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1-1
0 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-1
2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-3
2.1 AMI B3ZS/HDB3 Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2 Pulse Shaper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3 Line Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.3.1 Transmit Pulse Mask Templates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.4 Alarm Indication Signal (AIS) Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.5 Transmit Monitor Block  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.6 Jitter Generation (Intrinsic). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
3 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-10
3.1 Receive Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
3.2 AGC/VGA Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
3.3 Receive Equalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
3.4 The PLL Clock Recovery Circuit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
3.5 Receive Loss Of Signal (RLOS) Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
3.6 B3ZS/HDB3 Decoder With Bipolar Violation Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
3.7 Data Squelching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
4 Jitter Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-13
4.1 Jitter Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
5 Additional M2833i Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-15
5.1 Bias Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
5.2 Power-On Reset (POR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
5.3 Loopback Multiplexers (MUXes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

 Table of Contents M28331/M28332/M28333 (–3x)
 Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
vi Mindspeed Technologies™28333-DSH-003-A
2.6 Mechanical Specifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-18
2.7 Electrical Characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-19
2.7.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.7.2 ESD Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
2.7.3 Recommended Operating Conditions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
2.8 DC Characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-21
2.9 AC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-22
2.10 Transceiver Specification Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2-24
3.0 Applications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 PCB Design Considerations for the M2833i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3-1
3.1.1 Power Supply and Ground Plane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2 Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2.1 RBIAS Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2.2 VGG Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.2.3 Termination Resistors and Capacitors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.3 Impedance Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.4 Other Passive Parts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.5 IBIS Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.6 Recommended Vendors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Appendix A: Applicable Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  A-1
Appendix B: Exposed Thin Quad Flat (ETQFP) Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-1
B.1 Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   B-2
B.2 Package Thermal Characterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   B-3
B.2.1 Heat Removal Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-3
B.2.2 Thermal Lands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-3
B.2.3 PCB Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-5
B.2.4 Thermal Test Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-6
B.2.4.1 Test Environment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-6
B.2.4.2 Thermal Test Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-6
B.2.5 Package Thermal Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-7
B.2.5.1 Calculation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-7
B.2.5.2 Package Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B-7
B.3 Solder Stencil Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   B-9
B.4 Solder Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   B-9
Appendix C: Power Sequencing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  C-1

M28331/M28332/M28333 (–3x)  List of Figures
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit  
28333-DSH-003-A Mindspeed Technologies™vii
List of Figures
Figure 1-1. M28331-3x Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Figure 1-2. M28332-3x Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Figure 1-3. M28333-3x Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Figure 2-1. Typical Application Of Single M2833i Channel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Figure 2-2. Pulse Shaper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Figure 2-3. Pulse Measurement Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Figure 2-4. Transmit Pulse Mask for DS3 Rates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
Figure 2-5. Transmit Pulse Mask for STS-1 Rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Figure 2-6. Transmit Pulse Mask for E3 Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Figure 2-7. AIS Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Figure 2-8. Minimum Jitter Tolerance Requirement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Figure 2-9. Maximum Jitter Transfer Curve Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Figure 2-10. Remote Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Figure 2-11. Local Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Figure 2-12. M2833i-3x Mechanical Drawing (100-Pin)—Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Figure 2-13. Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Figure 2-14. Test Setup for Measurement of Output Pulse Amplitude. . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
Figure 3-1. DS3/E3 Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Figure B-1. Schematic Representation of the Package Components . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Figure B-2. Package and PCB Land Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Figure B-3. Internal Structure for a Two-Layer PCB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5
Figure B-4. Internal Structure For a Six-Layer PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5
Figure B-5. Test Performance Structure (A = 100 mm, B = 100 mm, LP = 1.40 mm, LB = 1.60 mm)  . . B-6
Figure B-6. Package Thermal Resistance as a Function of Airflow Velocity for a 48-ETQFP Package  . . B-7
Figure B-7. Package Thermal Resistance as a Function of Airflow Velocity for an 64 ETQFP. . . . . . . . . B-8
Figure B-8. Package Thermal Resistance as a Function of Airflow Velocity for an 80 ETQFP. . . . . . . . . B-8
Figure B-9. Typical IR Reflow Profile for Eutectic Sn63:Pb37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10
Figure B-10. Typical Forced Convection Reflow Profile for Eutectic Sn63:Pb37  . . . . . . . . . . . . . . . . . . B-11
Figure C-1. Power -up sequence of VGG and VDD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Figure C-2. Power-down sequence of VGG and VDD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

List of Figures M28331/M28332/M28333 (–3x)

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

viii Mindspeed Technologies™28333-DSH-003-A

M28331/M28332/M28333 (–3x)  List of Tables
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit  
28333-DSH-003-A Mindspeed Technologies™ix
List of Tables
Table 1-1. M2833i-3x Pin Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Table 2-1. DS3 Transmit Template Specifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
Table 2-2. STS-1 Transmit Template Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Table 2-3. RLOS Threshold Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Table 2-4. Absolute Maximum Ratings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Table 2-5. ESD Ratings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Table 2-6. Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Table 2-7. DC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
Table 2-8. AC Characteristics (Logic Timing). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
Table 2-9. Receiver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Table 2-10. Transmitter Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
Table 2-11. Intrinsic Jitter Specifications (Receiver to Transmitter using Remote Loopback) . . . . . . . . 2-26
Table B-1. Dimensional Parameters (mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Table B-2. Specification for a Two-Layer Test Board  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-6
Table B-3. Specification for a Four-Layer Test Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-6
Table B-4. Specification for Delco Thermal Test Chips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
Table B-5. Test Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8

List of Tables M28331/M28332/M28333 (–3x)

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

xMindspeed Technologies™28333-DSH-003-A

28333-DSH-003-A Mindspeed Technologies™1-1

1.0 Pin Description

1.1 Pin Assignments

Figures 1-1 (M28331-3x), 1-2 (M28332-3x), and 1-3 (M28333-3x) illustrate pin

assignments for the 100-pin ETQFP.

The input/output (I/O) column is coded as follows:

I = Input

O = Output

I/O = Bidirectional

P = Power

NOTE: All digital inputs and outputs contain 75 kΩ pull-down resistors.

When a channel is disabled (i.e., the PDx pin is tied low or not connected), all

receive and transmit analog circuitry powers down. Analog inputs (RLINE) are

ignored and analog outputs (TLINE) are high impedance. Digital inputs of a

powered-down channel are still active, but ignored. Overall noise on the device

can be lowered by not driving the digital inputs of a powered-down channel.

NOTE: When power is disconnected from the device, TLINE pins are low

impedance to ground if driven by more than one forward-bias diode

voltage (0.7 V) below ground. Additionally, driving TLINE, a

forward-bias diode voltage above the VGG pin, creates a low impedance

path from the TLINE pin to the VGG pin. Otherwise, the TLINE pins are

high impedance.

1.0 Pin Description M28331/M28332/M28333 (–3x)

1.1 Pin Assignments Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1-2 Mindspeed Technologies™28333-DSH-003-A

Figure 1-1. M28331-3x Pin Diagram

100985_015

100

DVDDC

ENDECDIS

RLOOP

LLOOP

RNEG/RLCV

RPOS/RNRZ

RCLK

RLOS

RLOSMAX

RLOSTHR

RLOSMDIS

TAIS

TCLK

TPOS/TNRZ

TNEG/NC

TLOS

REFCLK

REQH

XOE

LBO

TMONTST

E3MODE

DVSSC

VSS

RBIAS

VGG

RESET

GPD

DVDDIO

VDD

VSS

TVSS

TMONP

TLINEP

TLINEM

TMONM

TVDD

RVDD

RLINEP

RLINEM

RVSS

VSS

VDD

VSS

DVSSIO

M28331-3x

M28331/M28332/M28333 (–3x) 1.0 Pin Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 1.1 Pin Assignments

28333-DSH-003-A Mindspeed Technologies™1-3

Figure 1-2. M28332-3x Pin Diagram

100985_016

100

DVDDC

ENDECDIS

TMONTST

E3MODE

DVSSC

TVSS1

RBIAS

VGG

RESET

GPD

PD1

RLOOP1

LLOOP1

DVDDIO

LBO1

XOE1

REQH1

RLOSMAX1

RLOSTHR1

RLOSMDIS1

RNEG1/RLCV1

RPOS1/RNRZ1

RCLK1

RLOS1

REFCLK1

TLOS1

TNEG1/NC1

TPOS1/TNRZ1

TCLK1

TAIS1

TMON1P

TLINE1P

TLINE1M

TMON1M

TVDD1

RVDD1

RLINE1P

RLINE1M

RVSS1

VSS

VDD

VSS

TVSS2

TMON2P

TLINE2P

TLINE2M

TMON2M

TVDD2

RVDD2

RLINE2P

RLINE2M

RVSS2

PD2

RLOOP2

LLOOP2

DVSSIO

LBO2

XOE2

REQH2

RLOSMAX2

RLOSTHR2

RLOSMDIS2

RNEG2/RLCV2

RPOS2/RNRZ2

RCLK2

RLOS2

REFCLK2

TLOS2

TNEG2/NC2

TPOS2/TNRZ2

TCLK2

TAIS2

M28332-3x

1.0 Pin Description M28331/M28332/M28333 (–3x)

1.1 Pin Assignments Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1-4 Mindspeed Technologies™28333-DSH-003-A

Figure 1-3. M28333-3x Pin Diagram

100985_006

100

DVDDC

ENDECDIS

PD2

RLOOP2

LLOOP2

RNEG2 / RLCV2

RPOS2 / RNRZ2

RCLK2

RLOS2

RLOSMAX2

RLOSTHR2

RLOSMDIS2

TAIS2

TCLK2

TPOS2/TNRZ2

TNEG2/NC2

TLOS2

REFCLK2

REQH2

XOE2

LBO2

TMONTST

E3MODE

DVSSC

TVSS1

RBIAS

VGG

RESET

GPD

PD1

RLOOP1

LLOOP1

DVDDIO

LBO1

XOE1

REQH1

RLOSMAX1

RLOSTHR1

RLOSMDIS1

RNEG1/RLCV1

RPOS1/RNRZ1

RCLK1

RLOS1

REFCLK1

TLOS1

TNEG1/NC1

TPOS1/TNRZ1

TCLK1

TAIS1

TMON1P

TLINE1P

TLINE1M

TMON1M

TVDD1

RVDD1

RLINE1P

RLINE1M

RVSS1

TVSS2

TMON2P

TLINE2P

TLINE2M

TMON2M

TVDD2

RVDD2

RLINE2P

RLINE2M

RVSS2

TVSS3

TMON3P

TLINE3P

TLINE3M

TMON3M

TVDD3

RVDD3

RLINE3P

RLINE3M

RVSS3

PD3

RLOOP3

LLOOP3

DVSSIO

LBO3

XOE3

REQH3

RLOSMAX3

RLOSTHR3

RLOSMDIS3

RNEG3/RLCV3

RPOS3/RNRZ3

RCLK3

RLOS3

REFCLK3

TLOS3

TNEG3/NC3

TPOS3/TNRZ3

TCLK3

TAIS3

M28333-3x

M28331/M28332/M28333 (–3x) 1.0 Pin Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 1.1 Pin Assignments

28333-DSH-003-A Mindspeed Technologies™1-5

Table 1-1. M2833i-3x Pin Definitions (1 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

Coaxial Line Pins

17 ——RLINEP Ch1 positive

receive data

I Differential inputs for each channel from its

respective receive coax line. The RX expects

balanced differential inputs, usually

achieved using a 1:1 transformer.

The inputs are internally DC biased to 1.9 V.

—77RLINE1P

18 ——RLINEM Ch1 negative

receive data

—88RLINE1M

—27 17 RLINE2P Ch2 positive

receive data

—28 18 RLINE2M Ch2 negative

receive data

——27 RLINE3P Ch3 positive

receive data

——28 RLINE3M Ch3 negative

receive data

12 ——TLINEP Ch1 positive

transmit data

O Differential, coax-driver balanced outputs

for pulse-shaped AMI B3ZS/HDB3 encoded

waveforms for each channel.

These pins should be connected to the

primary side of the 1:1 transformer through

two backmatch resistors. See Figure 3-1.

—22TLINE1P

13 ——TLINEM Ch1 negative

transmit data

—33TLINE1M

—22 12 TLINE2P Ch2 positive

transmit data

—23 13 TLINE2M Ch2 negative

transmit data

——22 TLINE3P Ch3 positive

transmit data

——23 TLINE3M Ch3 negative

transmit data

1.0 Pin Description M28331/M28332/M28333 (–3x)

1.1 Pin Assignments Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1-6 Mindspeed Technologies™28333-DSH-003-A

Digital Data Pins

69 ——RPOS/

RNRZ

Ch1 receive

Positive rail or

NRZ data

O Resynchronized receive data intended to be

strobed out by the corresponding RCLK.

When ENDECDIS = 1, these outputs are

positive and negative AMI data (RPOS and

RNEG).

When ENDECDIS = 0, these outputs are

decoded NRZ data (RNRZ) and line code

violation (RLCV). A line code violation is

indicated when RLCV = 1.

See notes on the ENDECDIS pin in the

Control Signals section.

—84 84 RPOS1/

RNRZ1

70 ——RNEG/

RLCV

Ch1 receive

Negative rail or

line code

violation

—85 85 RNEG1/

RLCV1

—41 69 RPOS2/

RNRZ2

Ch2 receive

Positive rail or

NRZ data

—40 70 RNEG2/

RLCV2

Ch2 receive

Negative rail or

line code

violation

——41 RPOS3/

RNRZ3

Ch3 receive

Positive rail or

NRZ data

——40 RNEG3/

RLCV3

Ch3 receive

Negative rail or

line code

violation

68 ——RCLK Receive clock

Ch1

O Recovered clock for each channel receiver,

intended for strobing the corresponding

RDAT into the following framer or logic.

—83 83 RCLK1

—42 68 RCLK2 Receive clock

Ch2

——42 RCLK3 Receive clock

Ch3

Table 1-1. M2833i-3x Pin Definitions (2 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

M28331/M28332/M28333 (–3x) 1.0 Pin Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 1.1 Pin Assignments

28333-DSH-003-A Mindspeed Technologies™1-7

61 ——TPOS/

TNRZ

Ch1 transmit

Positive rail or

NRZ data

I Synchronized transmit data intended to be

strobed in by the corresponding TCLK.

When ENDECDIS = 1, these inputs are

expected to be positive and negative AMI

data (TPOS and TNEG).

When ENDECDIS = 0, these inputs are

expected to be uncoded NRZ data (TNRZ)

and no connects (NC).

See notes on the ENDECDIS pin in the

Control Signal section.

—78 78 TPOS1/

TNRZ1

60 ——TNEG/

Ch1 transmit

Negative rail or

no connect data

—79 79 TNEG1/

NC1

—47 61 TPOS2/

TNRZ2

Ch2 transmit

Positive or NRZ

data

—46 60 TNEG2/

NC2

Ch2 transmit

Negative data or

no connect data

——47 TPOS3/

TNRZ3

Ch3 transmit

Positive or NRZ

data

——46 TNEG3/NC3 Ch3 transmit

Negative data or

no connect data

62 ——TCLK Transmit clock

Ch1

I Transmit bit clock input for strobing with

transmit data into the M2833i.

—77 77 TCLK1

—48 62 TCLK2 Transmit clock

Ch2

——48 TCLK3 Transmit clock

Ch3

67 ——RLOS Loss of signal

Ch1

O Loss Of Signal (LOS) indication for each

channel, as determined by insufficient pulse

density. Signal loss detected when RLOS =

1. Loss of signal is asserted and deasserted

under the conditions discussed in

Section 2.3.5.

—82 82 RLOS1

—43 67 RLOS2 Loss of signal

Ch2

——43 RLOS3 Loss of signal

Ch3

Table 1-1. M2833i-3x Pin Definitions (3 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

1.0 Pin Description M28331/M28332/M28333 (–3x)

1.1 Pin Assignments Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1-8 Mindspeed Technologies™28333-DSH-003-A

RLOS Threshold and Control

66 ——RLOSMAX RLOS maximum I LOS Threshold Control pins. RLOSMAX and

RLOSTHR select the trip level and

hysteresis level of the comparator. See

Table 2-3 for the Threshold Value settings.

65 ——RLOSTHR RLOS threshold I

—88 88 RLOSMAX1 Channel 1 RLOS

max

—87 87 RLOSTHR1 Ch 1 RLOS

threshold

—37 66 RLOSMAX2 Ch 2 RLOS max I

—38 65 RLOSTHR2 Ch 2 RLOS

threshold

——37 RLOSMAX3 Ch 3 RLOS max I

——38 RLOSTHR3 Ch 3 RLOS

threshold

64 ——RLOSMDIS RLOS data mute

disable

I Disable RLOS Data Mute on RLOS

detection.

RLOSMDIS = 0 to enable auto-data squelch

upon RLOS.

RLOSMDIS = 1 for no data squelch upon

RLOS.

—86 86 RLOSMDIS1 Ch 1 RLOS data

mute disable

—39 64 RLOSMDIS2 Ch 2 RLOS data

mute disable

——39 RLOSMDIS3 Ch 3 RLOS data

mute disable

Table 1-1. M2833i-3x Pin Definitions (4 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

M28331/M28332/M28333 (–3x) 1.0 Pin Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 1.1 Pin Assignments

28333-DSH-003-A Mindspeed Technologies™1-9

Control Signals

74 74 74 ENDECDIS Encoder/decoder

disable (for all

channels)

I For testing purposes and in applications

where the decoder needs to be bypassed,

the decoder can be enabled/disabled as

follows:

1 = Dual rail pulse coded data format. Input

transmit data pins TPOS, TNRZ, TNEG and

NC are interpreted as TPOS and TNEG

(encoded positive and negative rail data).

Output receive data pins RPOS and RNRZ,

and RNEG and RLCV are interpreted as

RPOS and RNEG, with RPOS having a

positive pulse in place of every positive AMI

pulse and RNEG having a negative pulse in

place of every negative AMI pulse.

0 = NRZ format. Transmit data pins TPOS

and TNEG are interpreted as TNRZ and NC

(not connected). Receive data pins RPOS

and RNEG are interpreted as RNRZ and

RLCV. In this mode, all line code violations

are reported as active high on RLCV.

63 ——TAIS Transmit Ch1

AIS mode enable

I Transmission of Alarm Indication Signal

(AIS) for a given channel. Replace transmit

data with AIS signal. The AMI form of AIS

supported is alternating 1s.

(+1, -1, +1, -1, +1, ...)

AIS will overwrite data during local

loopback.

1 = AIS mode enabled

0 = AIS mode disabled

—76 76 TAIS1

—49 63 TAIS2 Transmit Ch2

AIS mode enable

——49 TAIS3 Transmit Ch3

AIS mode enable

—

53 53 53 E3MODE E3MODE I When the pin is set to high, it enables the

E3 mode on all channels, instead of the

DS3/STS-1 mode. This also changes the

pulse shaper to E3 mode and overrides all

LBO pins. It also changes the

encoder/decoder from B3ZS mode to HDB3

mode.

1 = E3 mode

0 = DS3/STS-1 mode

Table 1-1. M2833i-3x Pin Definitions (5 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

1.0 Pin Description M28331/M28332/M28333 (–3x)

1.1 Pin Assignments Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1-10 Mindspeed Technologies™28333-DSH-003-A

55 ——LBO Transmit line

Ch1 build-out

mode

I Line build-out mode per channel, based on

the length of cable on the transmit side of

the cross-connect block. This bit is

overridden and the pulse shaper is disabled

(no pulse shaping) if E3MODE = 1.

1 = Inserts line build-out into the transmit

channel. Usually used when the transmit

cable is less than 450 feet in length.

0 = Line build-out bypassed (not inserted).

Usually used when the transmit cable is

greater than 450 feet in length.

—91 91 LBO1

—34 55 LBO2 Transmit line

Ch2 build-out

mode

——34 LBO3 Transmit line

Ch3 build-out

mode

71 ——LLOOP Local loopback

enable Ch1

I Local loopback enable per channel. The

transmit data is looped back immediately

from the encoder to the decoder in place of

the received data.

1 = local loopback enabled

0 = local loopback disabled

—93 93 LLOOP1

—32 71 LLOOP2 Local loopback

enable Ch2

——32 LLOOP3 Local loopback

enable Ch3

72 ——RLOOP Remote

loopback enable

Ch1

I Remote loopback enable per channel. The

receive data, retimed after clock recovery, is

looped back into the AMI generator in place

of the transmit data.

1 = remote loopback enabled

0 = remote loopback disabled

—94 94 RLOOP1

—31 72 RLOOP2 Remote

loopback enable

Ch2

——31 RLOOP3 Remote

loopback enable

Ch3

56 ——XOE Transmit output

enable Ch1

I Transmit output enable per channel.

1 = transmit line output driver enabled

0 = transmit output driver set to high

impedance state

—90 90 XOE1

—35 56 XOE2 Transmit output

enable Ch2

——35 XOE3 Transmit output

enable Ch3

Table 1-1. M2833i-3x Pin Definitions (6 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

M28331/M28332/M28333 (–3x) 1.0 Pin Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 1.1 Pin Assignments

28333-DSH-003-A Mindspeed Technologies™1-11

57 ——REQH Ch1 Receive

High EQ Gain

Enable

I The equalizer in the M2833i has two gain

settings. The higher gain setting is designed

to optimally equalize a nominally-shaped

(meets the pulse template), pulse-driven

DS3 or STS-1 waveform that is driven

through 0–900 feet of cable.

Square-shaped pulses such as E3 or

DS3-HIGH require less high-frequency gain

and should use the low EQ gain setting.

REQH = 1 high EQ gain (DS3/STS-1 modes)

REQH = 0 low EQ gain (E3/DS3

Square Modes)

—89 89 REQH1

—36 57 REQH2 Ch2 Receive

High EQ Gain

Enable

——36 REQH3 Ch3 Receive

High EQ Gain

Enable

Power/Ground

15 ——TVDD TX power Ch1 P Power pins for transmit circuitry per

channel (3.3 V).

55TVDD1

—25 15 TVDD2 TX power Ch2 P

——25 TVDD3 TX power Ch3 P

10 ——TVSS TX ground Ch1 P Ground pins for transmit circuitry per

channel.

—100 100 TVSS1

—20 10 TVSS2 TX ground Ch2 P

——20 TVSS3 TX ground Ch3 P

16 ——RVDD RX power Ch1 P Power pins for receive circuitry per channel

(3.3 V).

Connect to 3.3 V power.

—6 6 RVDD1

—26 16 RVDD2 RX power Ch2 P

——26 RVDD3 RX power Ch3 P

19 ——RVSS RX ground Ch1 P Ground pins for receive circuitry per

channel.

Connect to ground.

—9 9 RVSS1

—29 19 RVSS2 RX ground Ch2 P

——29 RVSS3 RX ground Ch3 P

75 75 75 DVDDC Digital core

power

P Digital core power for all channels (3.3 V).

51 51 51 DVSSC Digital core

ground

P Digital core ground for all channels.

98 98 98 VGG 5 V/3.3 V ESD

pin (1)

P 5 V supply for 5 V-tolerant, digital pad ESD

diodes. No static power is drawn from pin.

92 92 92 DVDDIO Digital I/O power P Connect to 3.3 V digital power.

33 33 33 DVSSIO Digital ground P Digital ground.

5, 6, 25, 26 15, 16 —VDD Power P Connect to 3.3 V power.

Table 1-1. M2833i-3x Pin Definitions (7 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

1.0 Pin Description M28331/M28332/M28333 (–3x)

1.1 Pin Assignments Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1-12 Mindspeed Technologies™28333-DSH-003-A

9, 20, 29,

100

10, 19 —VSS Ground P Connect to ground.

Miscellaneous

73 —— PD Power down for

Ch1

I Power down transceiver channel

0 = Power down channel (off)

1 = Channel active (on)

Note: A special power-down mode exists

when all three PDBs are set low. This

special mode shuts off the entire chip

(including biasing).

—95 95 PD1

—30 73 PD2 Power down for

Ch2

——30 PD3 Power down for

Ch3

58 ——REFCLK Reference clock

for Ch1

I Reference clock from off-chip.

This clock should be set to one of the

following with all rates = ±20 ppm

tolerance:

•E3 rate (34.368 MHz)

•DS3 rate (44.736 MHz)

•STS-1 rate (51.84 MHz)

The clock rate should correspond to the

mode of operation that has been chosen for

the channel. See Section 2.5.2, Power-On

Reset, about the valid clock available during

power-up.

—81 81 REFCLK1

—44 58 REFCLK2 Reference clock

for Ch2

——44 REFCLK3 Reference clock

for Ch3

99 99 99 RBIAS Bias resistor O A 12.1 kΩ ± 1% resistor tied from this pin

to ground provides the current reference to

the entire chip.(2)

97 97 97 Reset Reset I Asynchronous reset (reset entire device).

96 96 96 GPD Global Power

down

I Power down (Static Idd testing).

0 = Power down disable

1 = Power down active

Table 1-1. M2833i-3x Pin Definitions (8 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

M28331/M28332/M28333 (–3x) 1.0 Pin Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 1.1 Pin Assignments

28333-DSH-003-A Mindspeed Technologies™1-13

11 ——TMONP Ch1 positive

input

I Transmit monitor input pins are normally

tied to their respective transmit line

outputs, i.e., (TMON1P ⇒ TLINE1P and

TMON1M ⇒ TLINE1M).

Loss of signal outputs are active high

when the monitor inputs detect no signal.

The TX monitor test pin will assert all

TLOS outputs when TMONTST is high. This

is used to test board level functionality

downstream from the TLOS outputs.

—11TMON1P

14 ——TMONM Ch1 negative

input

—44TMON1M

—21 11 TMON2P Ch2 positive

input

—24 14 TMON2M Ch2 negative

input

——21 TMON3P Ch3 positive

input

——24 TMON3M Ch3 negative

input

59 ——TLOS TX loss of signal

Ch1 Output

—80 80 TLOS1

—45 59 TLOS2 TX loss of signal

Ch2 Output

——45 TLOS3 TX loss of signal

Ch3 Output

54 54 54 TMONTST TX monitor test

1–4, 7, 8,

21–24, 27,

28, 30–32,

34–50, 52,

76–91,

93–95

11–14,

17–18, 50,

52, 55–73

50, 52 —No connect —Not connected.

NOTE(S):

(1) This pin should be connected to 3.3 V in an all-3.3 V design.

(2) Placing a capacitor from this pin to ground may result in instabilities.

3. All digital input pins contain a 75 kΩ pull-down resistor from input to DVSS.

Table 1-1. M2833i-3x Pin Definitions (9 of 9)

Pin #

Signal Name Description I/O/P Notes

M28331-3x M28332-3x M28333-3x

1.0 Pin Description M28331/M28332/M28333 (–3x)

1.1 Pin Assignments Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1-14 Mindspeed Technologies™28333-DSH-003-A

28333-DSH-003-A Mindspeed Technologies™2-1

2.0 Functional Description

2.1 Overview

The M28333 is a triple E3/DS3/STS-1 Line Interface Unit (LIU). It is the

physical layer interface between the data framer (or other terminal-side

equipment) and the electrical cable used for data transmission.

The M28333 LIU consists of three independent data transceivers that can

operate over type 734/728 coaxial cable at the rates of 34.368 Mbps (E3), 44.736

Mbps (DS3), and 51.84 Mbps (STS-1). The transmit side takes an NRZ or

already-encoded dual rail input and encodes it into AMI B3ZS (for DS3/STS-1)

or HDB3 (for E3) analog waveforms to be transmitted over 75 Ω coaxial cable.

The receiver side takes in the attenuated and distorted analog receive signal and

equalizes, slices, and resynchronizes the signal before decoding it to the NRZ

output or sending out a non-decoded dual rail.

M28331 and M28332 are single- and dual-E3/DS3/STS-1 LIUs, respectively.

In all respects, their performance and features are identical to the M28333.

The architecture of the M2833i includes the following internal functions for

each channel:

Transmitter:

•AMI B3ZS/HDB3 encoder

•pulse shaper

•line driver

•Alarm Indication Signal (AIS) insertion

•transmit monitor

Receiver:

•receive sensitivity

•Automatic Gain Control (AGC)

•receive equalizer

•Clock Recovery circuit

•Loss Of Signal (LOS) detector

•B3ZS/HDB3 decoder with bipolar violation detector

•data squelching

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.1 Overview Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-2 Mindspeed Technologies™28333-DSH-003-A

Additional Functions:

•bias generator

•power-on reset

•loopback MUXes

In addition, each channel has the ability to perform remote and local

loopbacks. Figure 2-1 illustrates a typical application using the M2833i in a

channel.

External pins are provided to configure the various line rates and formats for

each channel.

The M2833i is used as a data transceiver over a coaxial cable that is up to

900 feet long (or up to 450 feet from the DSX) in an on-premise environment

within any public or private networks which use these data rates.

Figure 2-1. Typical Application Of Single M2833i Channel

0–450 ft COAX

(type 734/728) DSX

0–450 ft COAX

(type 734/728) DSX

0–450 ft COAX

(type 734/728)

0–450 ft COAX

(type 734/728)

100604_012

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.2 Transmitter

28333-DSH-003-A Mindspeed Technologies™2-3

2.2 Transmitter

This section describes the detailed operation of the various blocks in the M2833i

transmitter.

2.2.1 AMI B3ZS/HDB3 Encoder

The ENDECDIS and E3MODE pins configure the encoder mode.

When ENDECDIS = 0, the encoder is receiving non-encoded Nonreturn to

Zero (NRZ) data on the TNRZ (TPOS) pin alone, and the NC (no connect)

(TNEG) pin is ignored.

Data is encoded into a representation of a three-level B3ZS (E3MODE = 0) or

HDB3 (E3MODE = 1) signal before going on to the pulse shaper in the form of

two binary signals representing the positive and negative three-level pulses.

When ENDECDIS = 1, the encoder is disabled. The encoder passes

already-encoded data over TPOS (TNRZ) and TNEG (NC) to the pulse shaper.

The transmit digital data is clocked into the chip via a rising TCLK edge,

which must be equal to the symbol rate (line rate). A small delay added to the data

provides a certain amount of negative data hold time.

2.2.2 Pulse Shaper

The pulse shaper converts the two digital (clocked) positive and negative pulses

into a single analog three-level Alternate Mark Inversion (AMI) pulse. The pulses

are in Return to Zero (RZ) format, meaning that all positive and negative pulses

have a duration of the first half of the symbol period.

For the E3 rate (E3MODE = 1), the AMI pulse is a full-amplitude,

square-shaped pulse with very little slope.

Figure 2-2. Pulse Shaper

500020_010

Pulse

Shaper

LBO

Mode

LBO = 0

LBO = 1

+ Pulse – Pulse

Line Driver

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.2 Transmitter Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-4 Mindspeed Technologies™28333-DSH-003-A

For DS3/STS-1 rates, a pulse-shaper block is used to shape the transmit

waveform and reduce its high-frequency energy content. This ensures that the

transmit pulse template is met at the cross-connect block, which follows 0–450

feet of transmit-side coaxial cable.

2.2.3 Line Driver

The differential line driver takes the filtered transmit waveform, increases it to the

proper level, and drives it into the transmit magnetics. The two external discrete

back-matching resistors (31.6 Ω) aid in line matching. The driver is presented

with an approximately 150 Ω differential load. Driver gain accounts for the 6 dB

gain loss in the back-matching resistors.

Figure 2-3 illustrates the Pulse/Power template measurement points for the

various data rates.

2.2.3.1 Transmit Pulse

Mask Templates

The Transmit Pulse Mask characteristics of the M2833i device are designed so

that the transmitted output meets the Pulse Shape mask specified in ITU-T

Recommendation G.703.

Figure 2-3. Pulse Measurement Points

0–450 ft COAX

(type 734/728) DSX

0–450 ft COAX

Pulse/Power Template for E3

Pulse/Power Template for DS3/STS-1

(type 734/728) DSX

0–450 ft COAX

(type 734/728)

0–450 ft COAX

(type 734/728)

100604_013

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.2 Transmitter

28333-DSH-003-A Mindspeed Technologies™2-5

Figure 2-4. Transmit Pulse Mask for DS3 Rates

NOTE(S):

An Isolated Pulse is a pulse preceded by at least two zeros and followed by one or more zeros.

In judging the conformance of an isolated pulse to the mask, it is permissable to do the following:

1. Position the mask horizontally as necessary to encompass the pulse

2. Uniformly scale the amplitude of the isolated pulse to fit the mask

Transmit Pulse Mask for DS3 Rates

-0.2

0.2

0.4

0.6

0.8

1.2

-1.0

-0.5

0.0

0.5

1.0

1.5

Normalized Symbol Time

Normalized Pulse Amplitude

Table 2-1. DS3 Transmit Template Specifications

Time Axis Range (UI)(1) Normalized Amplitude Equation

Upper Curve

–0.85 ≤ T ≤ –0.68 0.03

–0.68 ≤ T ≤ 0.36 0.03 + 0.5 {1 + sin [(π / 2)(1 + T / 0.34)]}

0.36 ≤ T ≤ 1.4 0.08 + 0.407 e –1.84(T – 0.36)

Lower Curve

–0.85 ≤ T ≤ –0.36 –0.03

–0.36 ≤ T ≤ 0.36 –0.03 + 0.5{1 + sin[(π / 2)(1 + T / 0.18)]}

0.36 ≤ T ≤ 1.4 –0.03

NOTE(S):

(1) UI = 1 / (System Clock Frequency)

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.2 Transmitter Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-6 Mindspeed Technologies™28333-DSH-003-A

Figure 2-5. Transmit Pulse Mask for STS-1 Rates

NOTE(S):

An Isolated Pulse is a pulse preceded by at least two zeros and followed by one or more zeros.

In judging the conformance of an isolated pulse to the mask, it is permissable to do the following:

1. Position the mask horizontally as necessary to encompass the pulse

2. Uniformly scale the amplitude of the isolated pulse to fit the mask

Transmit Pulse Mask for STS-1 Rates

-0.2

0.2

0.4

0.6

0.8

1.2

-1.0

-0.5

0.0

0.5

1.0

1.5

Normalized Symbol Time

Normalized Pulse Amplitude

Table 2-2. STS-1 Transmit Template Specifications

Time Axis Range (UI)(1) Normalized Amplitude Equation

Upper Curve

–0.85 ≤ T ≤ –0.68 0.03

–0.68 ≤ T ≤ 0.26 0.03 + 0.5 {1 + sin [(π / 2)(1 + T / 0.34)]}

0.26 ≤ T ≤ 1.4 0.1 + 0.61 e –2.4(T – 0.26)

Lower Curve

–0.85 ≤ T ≤ –0.36 –0.03

–0.36 ≤ T ≤ 0.36 –0.03 + 0.5 {1 + sin[(π / 2)(1 + T / 0.18)]}

0.36 ≤ T ≤ 1.4 –0.03

NOTE(S):

(1) UI = 1 / (System Clock Frequency)

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.2 Transmitter

28333-DSH-003-A Mindspeed Technologies™2-7

Figure 2-6. Transmit Pulse Mask for E3 Rate

500118a_1

17 ns

0.1

1.0

0.1

0.2

14.55 ns

8.65 ns

12.1 ns

24.5 ns

29.1 ns

Time

Volts

0.2

0.5

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.2 Transmitter Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-8 Mindspeed Technologies™28333-DSH-003-A

2.2.4 Alarm Indication Signal (AIS) Generator

When TAIS is asserted, an AIS replaces the transmit data at TPOS and TNEG.

The E3 type of AIS signal (all 1s) is supported. In three-level signal form, this is a

continuously alternating positive and negative pulse stream, as if the transmit data

were a continuous string of logical 1s. Figure 2-7 illustrates the AIS signal.

The TAIS pin has the same data latency as the TX data pins and can be used to

replace single symbols within a data stream. When the encoder is disabled

(ENDECDIS = 1), the TAIS mode maintains the proper phase, based upon the

polarity of the last 1 received.

The AIS overwrites data during local loopback operation, it does not affect

remote loopback operation.

Figure 2-7. AIS Signal

POSITIVE

PULSE

NEGATIVE

PULSE

TLINEP

(output voltage)

TLINEN

(output voltage)

8333_009

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.2 Transmitter

28333-DSH-003-A Mindspeed Technologies™2-9

2.2.5 Transmit Monitor Block

The Transmit (TX) Monitor pins allow the M2833i to monitor for certain fault

condition occurrences such as short circuits or defective channel output drivers in

the device. The TX Monitor inputs (TMONP and TMONM) are independent

functions where TMONP and TMONM must be externally connected (via 0-Ω

resistors or directly) to the TLINEP and TLINEM/N pins.

The TX monitors are designed to monitor the line driver outputs for pulses

greater than the threshold of ±0.5 V and to assert a Loss Of Signal (TLOS)

indicator when no output pulse has been detected for 32 TCLK periods. When the

TMONP/TMONM pins are connected, the TX Monitor circuitry only responds to

a voltage difference between the pair, i.e., if TLINEP stops working but

TLINEM/N is still swinging ±1 V, the TX Monitor circuit reports a Not Asserted

status.

After a TLOS condition is asserted, it will not deassert until a pulse is again

detected. TLOS Output pins are active-high when the monitor inputs do not

detect a signal. A special pin (TMONTST) is available for testing board-level

functionality downstream from the TLOS outputs. When TMONTST is high, it

asserts all TLOS channel outputs.

Other typical TMON circuit applications are for transmitter device

redundancy. This is where the TX monitor of one device is used to monitor a

second active device. When the TMON circuit detects an output driver failure, it

asserts a TLOS, which can now be used to activate the second device’s

transmitter and output disable the primary device.

2.2.6 Jitter Generation (Intrinsic)

The M2833i device meets the jitter generation requirements for various rates with

large margins, with the condition that the input transmit clock (TCLK) is

jitter-free. Data rates and jitter generation requirements are defined in the

following documents:

•E3 rate—ETSI TBR24, ITU-T G.823

•DS3 rate—Bellcore GR499, AT&T Accunet TR54014, ITU-T G.824

•STS-1 rate

—

Bellcore GR253

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.3 Receiver Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-10 Mindspeed Technologies™28333-DSH-003-A

2.3 Receiver

This section describes the detailed operation of the various blocks in the M2833i

receiver.

2.3.1 Receive Sensitivity

The receiver recovers data from the coaxial cable that is attenuated due to the

frequency-dependent characteristics of the cable. In addition, the receiver

compensates for the flat loss (across all frequencies) in the various electrical

components and the variation in transmitted signal power.

The M2833i device is able to recover data that has been attenuated by a

maximum of 900 feet of coax having characteristics and attenuation consistent

with ANSI T1.102-1993, Annex C, Figure C.2. This approximates the

characteristics of AT&T type 734/728 cable; almost the same attenuation

characteristic is achieved by one-half the length of AT&T type 735 cable.

2.3.2 AGC/VGA Block

The Variable Gain Amplifier (VGA) receives the AMI input signal from the

coaxial cable. The VGA supplies flat gain (independent of frequency) to make up

for various flat losses in the transmission channel and for loss at one-half the

symbol rate that cannot be made up by the equalizer. The VGA gain is controlled

by a feedback loop which senses the amplitude of the equalizer output, acting to

servo this amplitude for optimal slicing.

2.3.3 Receive Equalizer

The receive equalizer receives the differential signal from a VGA and boosts the

high frequency content of the signal to reduce intersymbol interference (ISI) to

the point that correct decisions can be made by the slicer with a minimum of jitter

in the recovered data.

The REQH pin when set high (REQH = 1) boosts the amount of equalization in

the receive side of the LIU. DS3/STS-1 pulses require a greater amount of

equalization then standard E3 pulses. REQH is therefore normally set high

(REQH = 1) for standard DS3/STS-1 pulses.

For cases where a square-shaped DS3/STS-1 pulse (that does not meet the

DS3/STS-1 standards) is transmitted to the receiver REQH can be set low (REQH

= 0).

In E3 mode, the REQH pin should always be set low (REQH = 0) to prevent

over-equalization.

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.3 Receiver

28333-DSH-003-A Mindspeed Technologies™2-11

2.3.4 The PLL Clock Recovery Circuit

The clock recovery circuit (RX PLL) extracts the embedded clock from the sliced

data and provides this clock and the retimed data to the decoder (data mode).

Upon startup (after the internal reset is deasserted), the RX PLL uses a reference

clock (REFCLK) and a phase-frequency detector to lock to the correct data rate

(reference mode). During reference mode, the data outputs are squelched (set to

0). The RX PLL is kept in reference mode until a valid input is detected.

2.3.5 Receive Loss Of Signal (RLOS) Detector

The RLOS detector circuitry consists of 2 functional blocks: the analog section

and the digital. The analog section consists of high-speed, low-offset comparators

used for amplitude qualification. The digital block qualifies the pulse stream 1s

density and zero run length.

Two control pins, RLOSMAX and RLOSTHR, select the trip and hysteresis

comparator levels for each channel (see Table 2-3).

A control pin for each channel, RLOSMDIS, is used as follows to decide if

RLOS should disable data squelching:

RLOSMDIS = 0 for auto data squelch

RLOSMDIS = 1 for no data squelch

The digital block asserts RLOS when no valid pulses (per the analog section

described above) have been received for 128 REFCLKs. The digital block clears

the RLOS when the valid pulse density exceeds 20.3% with less than 64

consecutive zeros during an 128-symbol period.

2.3.6 B3ZS/HDB3 Decoder With Bipolar Violation Detector

In the M2833i device, when ENDECDIS = 0 (encoder/decoder enabled), the

decoder takes the output from the clock recovery circuit and decodes the data

(HDB3 or B3ZS) into a single retimed NRZ data signal. The data signal is then

sent out of the M2833i over the RNRZ (RPOS) pin. Any detected Line Code

Violations (LCV) are sent out over the corresponding RLCV (RNEG) pin. The

RLCV pin is asserted for one symbol period at the time the violation appears on

the RX output pin (RNRZ).

Table 2-3. RLOS Threshold Settings

RLOSMAX RLOSTHR Action Min

(mV)

Typical

(mV)

Max

(mV)

00RLOS Cleared—55 125

RLOS Declared 18 20 —

01RLOS Cleared—92 —

RLOS Declared —58 —

1xTest Mode———

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.3 Receiver Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-12 Mindspeed Technologies™28333-DSH-003-A

The following shows data sequence criteria for LCV; violations are indicated

in bold text. A valid bipolar pulse is indicated by a B. A bipolar violation

(non-alternating positive or negative) pulse is indicated by a V.

•Excessive zeros: 0, 0, 0, 0 (HDB3) or 0, 0, 0 (B3ZS). These violations are

passed on as 0 data on the RNRZ pin.

•Bipolar violation: B, 0, V (i.e., +1, 0, +1 or -1, 0, -1 for HDB3) B, V

(B3ZS and HDB3). These violations are passed on as 1 data on the RNRZ

pin.

•Coding violation: 0, 0, V (HDB3) or 0, V (B3ZS) with an even number of

Bs since the last valid 0 substitution V (follows coding rule). These

violations are passed on as 0 data on the RNRZ pin.

The even/odd counter (used to count the number of Bs between Vs) will count

a bipolar violation as a B. A coding violation or a valid 0 substitution resets the

counter.

When ENDECDIS = 1, the decoder is disabled, and the retimed slicer outputs

are sent out over RPOS (RNRZ) and RNEG (RLCV) pins. These outputs are then

decoded by the Framer or other downstream device. Line code violations are not

detected in this mode of operation. The decoder is configurable for either:

•E3 mode using HDB3 coding (E3MODE = 1)

•DS3/STS-1 mode using B3ZS coding (E3MODE = 0)

The receiver digital data outputs are centered on the rising edge of RCLK

(see Section 2.9).

2.3.7 Data Squelching

A counter in the receiver keeps track of the number of consecutive symbol

periods without a valid data pulse. When 128 or more 0s in a row are counted, the

receiver assumes that it has lost the signal and resets itself to try and regain the

signal. While the receiver is reacquiring the signal, the clock recovery block locks

to the reference clock and the data squelching is achieved by forcing the data bits

to zero. The data squelching is true in both NRZ and dual rail mode. When the

input signal has been properly amplified and equalized, the clock recovery PLL

will then switch to the incoming data.

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.4 Jitter Tolerance

28333-DSH-003-A Mindspeed Technologies™2-13

2.4 Jitter Tolerance

The M2833i receiver is able to tolerate a specified amount of high-frequency

jitter in the received signal while providing error-free operation (generally

defined as a bit error rate of less than 10–9). The specifications (illustrated in

Figure 2-9) for jitter tolerance are discussed in the following documents:

•E3 rate—ITU-T G.823 and ETSI TBR24 contain frequency masks for input

jitter tolerance.

NOTE: To meet jitter transfer requirements for loop-timed operation, an external

jitter attenuator is required. The jitter attenuator lessens jitter from the

receive clock.

•DS3 rate—Bellcore GR499 specifies jitter tolerance frequency masks for

Category I and Category II interfaces.

•STS-1 rate—Bellcore GR253 specifies jitter tolerance. It is noted that the

STS-1 jitter tolerance differs from DS3 requirements only for Category II

interfaces.

Figure 2-8. Minimum Jitter Tolerance Requirement

Receiver Jitter Tolerance

1.0 UI

10 UI

0.1 UI

Jitter Frequency (Hz)

Input Jitter Amplitude

10 Hz 100 Hz 10 kHz 100 kHz1 kHz

100604_014

1 MHz

2.3K 22.3K 60K 800K

300K

0.3

0.1

T3 [GR-499 (1995)]

Category II

T3 [GR-499 (1995)]

Category I

E3 [GR.823 (1993)] 1.5

0.15

Jitter Tolerance

CX28333

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.4 Jitter Tolerance Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-14 Mindspeed Technologies™28333-DSH-003-A

2.4.1 Jitter Transfer

The receiver must meet certain jitter transfer specifications between the input and

output jitter as a function of frequency. These specifications are only intended to

be met with the use of a jitter attenuator. Because the M2833i does not contain a

jitter attenuator, one will have to be supplied externally. For reference purposes,

the specifications are discussed in the following documents and shown in

Figure 2-9.

E3 rate—Assume the same as DS3.

DS3 rate—Bellcore GR499, section 7.3.2 and figures 7-3, 7-4, and 7-5,

defines and describes DS3 jitter transfer.

STS-1 rate—Bellcore GR253, section 5.6.2.1, defines and describes jitter

transfer for the STS-1 rate.

Figure 2-9. Maximum Jitter Transfer Curve Requirement

0.1 dB

Jitter Frequency

Jitter Gain

–19.9 dB

STS-1 Category II

DS3 Category I

DS3 Category II

(Note: All slopes are 20 dB/decade)

10 Hz 100 Hz 1 kHz 10 kHz 100 kHz

100985_012

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.5 Additional M2833i Functions

28333-DSH-003-A Mindspeed Technologies™2-15

2.5 Additional M2833i Functions

2.5.1 Bias Generator

To achieve good isolation between the channels, each channel utilizes an

independent power and ground to both transmit and receive. Additionally, each

channel has its own band gap voltage reference. Because only one external

resistor for current generation exists, only one band gap voltage can be used. The

band gap from Ch1 has been chosen for this task.

The 12.1 kΩ external resistor from pin RBIAS to ground, is specified to have

a tolerance of ±1%. This helps to keep tighter control on power dissipation and

circuit performance.

NOTE: Capacitance should be kept to a minimum on the RBIAS pin.

2.5.2 Power-On Reset (POR)

If the system cannot guarantee a valid REFCLK frequency input during the POR

cycle, the M2833i devices require assertion (active-high input pulse width, 1 µs

minimum) of the external reset signal (RESET, Pin 78 [80-pin package], Pin 97

[100-pin package]). Valid operation frequencies are DS3 (44.768 MHz ±20

ppm), E3 (34.368 MHz ±20 ppm), and STS-1 (51.84 MHz ±20 ppm). See the

M28331/2/3-3x Evaluation Module User Guide for crystal oscillator

specifications and vendor listings.

A POR circuit is provided in the M2833i device to initialize all resettable

digital logic and analog control lines. The POR circuit uses a fixed RC timer

(~1µs) to deassert itself when the power supply voltage reaches a minimum level

(~2 V). When the minimum supply voltage is reached (see Table 2-6), the

REFCLK input is counted for 128 clocks before the internal reset is deasserted.

At this time, the receiver block attempts to frequency lock (±5% tolerance) onto a

valid incoming REFCLK input. After frequency lock is achieved, the receiver

attempts to phase lock onto the valid RLINE receive signal.

NOTE: If a valid REFCLK input is not present when POR releases the internal

reset, the receiver block may be unable to lock to the RLINE receive

signal. It is common for some crystal oscillator types oscillate at a lower

fundamental frequency if the crystal oscillator supply has not reached its

minimum operation voltage.

2.5.3 Loopback Multiplexers (MUXes)

Two loopback MUXes per channel in the M2833i allow for local loopback

(terminal or framer side), remote loopback (cable side), or both. The RLOS signal

monitors the RX cable inputs irrespective of any loopback.

In remote loopback, set by asserting pin RLOOP high, the receive data

(retimed after clock recovery but not decoded) loops back into the pulse shaper in

place of the transmit data. Additionally, this data is sent out the RPOS, RNEG,

and RCLK pins.

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.5 Additional M2833i Functions Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-16 Mindspeed Technologies™28333-DSH-003-A

In local loopback, set by asserting pin LLOOP, the transmit data loops back

immediately from the encoder output to the decoder input in place of the received

data. Additionally, this data is sent out the TLINEP and TLINEM/N pins.

Figures 2-10 and 2-11 illustrate remote and local loopback flow.

NOTE: Transmit AIS operation overwrites data with an all 1’s pattern during local

loopback, it does not affect remote loopback operation.

Figure 2-10. Remote Loopback

DECODER

Monitor

PDATA

NDATA

DATCLK

ALOS REQH

REFCLK

RLINEP

RLINEM/N

TMONTST

TXMON

TMONM

TMONP

TLINEP

TLINEM/N

PDATA/

NDATA

TCLK

XOE

LBO

E3MODE

PDB

TPOS

TNEG

TCLK

TAIS

RLOOP

LLOOP

RPOS

RNEG

RCLK

RLOS

Pulse

Shaper

LINE

DRIVER

Encoder

ENDECDIS

Clock/

Data

Recovery

Receiver

DATA

MUX

RLOSTHR

RLOSMAX

RLOSMDIS

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.5 Additional M2833i Functions

28333-DSH-003-A Mindspeed Technologies™2-17

Figure 2-11. Local Loopback

DECODER

Monitor

PDATA

NDATA

DATCLK

ALOS REQH

REFCLK

RLINEP

RLINEM/N

TMONTST

TXMON

TMONM

TMONP

TLINEP

TLINEM/N

PDATA/

NDATA

TCLK

XOE

LBO

E3MODE

PDB

TPOS

TNEG

TAIS

RLOOP

LLOOP

RPOS

RNEG

RCLK

RLOS

Pulse

Shaper

LINE

DRIVER

Encoder

ENDECDIS

Clock/

Data

Recovery

Receiver

DATA

MUX

TCLK

RLOSTHR

RLOSMAX

RLOSMDIS

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.6 Mechanical Specifications Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-18 Mindspeed Technologies™28333-DSH-003-A

2.6 Mechanical Specifications

Figure 2-12. M2833i-3x Mechanical Drawing (100-Pin)—Dimensions

DD1D2

Pin #1

Ref. Mark

See DETAIL B

TOP

DETAIL B

BOTTOM

Dim.

Coplanarity

0.05

0.95

15.75

13.90

0.45

0.09

1.20 MAX.

12.00 REF.

8.00 REF.

1.00 REF.

0.22 REF.

0.50 REF.

0.08 MAX.

0.15

1.05

16.25

14.10

0.75

0.20

0.002

0.004

0.620

0.547

0.018

0.004

0.047 MAX.

0.472 REF.

0.315 REF.

0.039 REF.

0.009 REF.

0.020 REF.

0.003 MAX.

0.006

0.041

0.640

0.555

0.006

0.008

Ref. 100-Pin ETQFP (GP00-D543)mm

Millimeters Inches

Min. Max. Min. Max.

100985_008a

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.7 Electrical Characteristics

28333-DSH-003-A Mindspeed Technologies™2-19

2.7 Electrical Characteristics

2.7.1 Absolute Maximum Ratings

Table 2-4. Absolute Maximum Ratings

Symbol Parameter Min Max Unit

DVDDC/

RVDD/

TVDD/

VDD/

VGG

Power Supply Voltage –0.3 6 V

VIVoltage on Any Signal Pin –1.0 VGG + 0.3 V V

TST Storage Temperature –40 125 °C

TVSOL Vapor Phase Soldering

Temperature (1 min.)

—220 °C

θJA Thermal Resistance (Still

air, socketed)

—40 °C/W

θJA Thermal Resistance (Still

air, soldered)

—24 °C/W

θJc ——7.40 °C/W

FIT Failures in time at 89,000

device hours, temperature

of 55 °C, 0 failures.

—313 fits

NOTE(S):

1. Stresses above those listed as absolute maximum ratings may cause permanent damage

to the device. This is a stress rating only, and functional operation of the device at these or

any other conditions beyond those indicated in the other sections of this document is not

implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.7 Electrical Characteristics Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-20 Mindspeed Technologies™28333-DSH-003-A

2.7.2 ESD Ratings

Testing Method—The devices were subjected to ESD events at the rated voltage

with both positive and negative polarities relative to each other pin or supply

domain on the device. The given pin was then curve-traced to detect leaky or

shorted ESD diodes. The criterion for passing is 3 devices that withstand voltage

without any leaky pins or functional failures.

2.7.3 Recommended Operating Conditions

Table 2-6 specifies various operating conditions, power supplies, and the bias

resistor.

Table 2-5. ESD Ratings

Model Required Minimum Observed

Human Body 1,000 V 2,000 V

Machine 100 V 200 V

Charged Device 400 V 700 V

Table 2-6. Recommended Operating Conditions

Parameter Conditions Min Nom Max Unit

Power supply voltage

(±5%)

DVDDC, RVDD, TVDD,

VDD

3.135 3.3 3.465 V

ESD voltage(1, 2) VGG 3.135 5 5.5 V

External bias resistor Pin RBIAS to GND; ±1% 11.98 12.1 12.22 kΩ

NOTE(S):

(1) With 5 V logic input, VGG should be tied to 5 V. With 3.3 V logic input, VGG should be tied

to 3.3 V. VGG must be equal or greater than the power supply voltage.

(2) When VGG is operated at 5V, sequence VGG to DVDDC, RVDD, TVDD, and VDD as

discussed in Appendix C:.

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.8 DC Characteristics

28333-DSH-003-A Mindspeed Technologies™2-21

2.8 DC Characteristics

Table 2-7. DC Characteristics

Parameter Conditions Min Nom Max Unit

Vih high threshold Digital inputs (Logic 1) 2.0 —VGG + 0.3 V

Vil low threshold Digital inputs (Logic 0) –0.3 —0.8 V

Voh high threshold Digital outputs, Ioh = –4 mA 2.4 —— V

Vol low threshold Digital outputs, Iol = 4 mA —— 0.4 V

ILEAK (digital inputs/outputs) 0 V ≤ digital Vin ≤ VGG –10 —200 µA

ILEAK (analog inputs/outputs)

RLINExP, RLINExM, TLINExP,

TLINExM, TMONxP, TMONxM

— –270 —270 µA

Input capacitance ———10 pF

Load capacitance Digital outputs —— 15 pF

RLine/TLine capacitance Maximum load —— 50 pF

Transmit Monitor

Input impedance TMONP, TMONM to 0.25 V 7.5 10 12.5 kΩ

Input voltage range TMONP, TMONM to ground 0 —Vdd V

Input pulse threshold (TMONP, TMONM) ±0.4 ±0.5 ±0.6 V

TLOS asserted Number of TCLKs with no input 30 32 34 # TSYM

Power dissipation M28333

(–1x, –3x) Total chip(1) —0.83 1.0 W

Power dissipation

(M28332)

Total chip —— 0.8 W

Power dissipation

(M28331)

Total chip —— .450 W

NOTE(S):

1. The digital inputs of M2833i are TTL 5 V compliant when VGG = 5V. These inputs are diode protected to the VGG pin.

Additionally, all of the M2833i digital inputs contain 75 kΩ pull-down resistors.

2. The digital outputs of M2833i are also TTL 5 V compliant when VGG = 5V. However, these outputs do not drive to 5 V, nor do

they accept 5 V external pull-ups.

FOOTNOTE:

(1) Measured while transmitting and receiving all-1s pattern.

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.9 AC Characteristics Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-22 Mindspeed Technologies™28333-DSH-003-A

2.9 AC Characteristics

Table 2-8. AC Characteristics (Logic Timing)

Parameter Conditions Min Nom Max Unit

Tosym, Tisym

RCLK and TCLK

E3 (34.368 MHz)

DS-3 (44.736 MHz)

STS-1 (51.84 MHz)

—29.10

22.35

19.29

—ns

Clock Duty Cycle Towidth/Tosym, RCLK

Tiwidth/Tisym, TCLK

Tiwidth/Tisym, REFCLK

—55

Todelay ———3ns

Tisetup TPOS/TNRZ, TNEG,

TAIS

4——ns

Tihold TPOS/TNRZ, TNEG,

TAIS

0——ns

NOTE(S):

1. The description applies to the DS3, E3, and STS-1 clock rates and other parameters such

as pulse width, set-up time, hold time, and duty cycle.

2. The timing diagram, illustrated in Figure 2-13, describes the logical relationship between

various clock and data signals, and parameter values.

3. Todelay is measure with a 10–15 pF loading characteristic.

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.9 AC Characteristics

28333-DSH-003-A Mindspeed Technologies™2-23

Figure 2-13. Timing Diagram

TCLK

TPOS/TNRZ,

TNEG, TAIS,

Tisym

Tisetup Tihold

DATA INPUTS

Don't

Care Valid Data

Tiwidth

RCLK

RPOS/RNRZ,

RNEG/RLCV

Tosym

Todelay

DATA OUTPUTS

Towidth

Don't

Care

100604_016

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.10 Transceiver Specification Tables Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-24 Mindspeed Technologies™28333-DSH-003-A

2.10 Transceiver Specification Tables

Table 2-9. Receiver Specifications

Parameter Conditions Min Nom Max Units

Input common mode voltage Internal Bias

(RLINEP, RLINEM)

—1.9 —V

Receiver Sensitivity

(RLINEP-RLINEM)

DS3/E3/STS-1 17.5 ——mVpeak

Diff.

Cable reach AT&T-type 728/734 cable 900 —— feet

Input return loss (at cable

interface using recommended

ext. components)

860–1,720 kHz

1,720–34,368 kHz

34,368–51,550 kHz

—dB

RLOS asserted Number of consecutive 0s 127 128 129 Symbols

1s density threshold (RLOS

deasserted) 128 ±1 pulses with less than 64

consecutive zeros

20.1 20.3 20.5 %

M28331/M28332/M28333 (–3x) 2.0 Functional Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 2.10 Transceiver Specification Tables

28333-DSH-003-A Mindspeed Technologies™2-25

Table 2-10. Transmitter Specifications

Parameter Conditions Min Nom Max Units

Output return loss (at cable

interface using recommended

ext. components)

860–1,720 kHz

1,720–34,368 kHz

34,368–51,550 kHz

—dB

Output amplitude using test setup

in Figure 2-14.

NOTE: Does not include ext.

component variation.

E3MODE = 1, E3 rate

E3MODE = 0, LBO = 0, DS3 rate

E3MODE = 0, LBO = 1, DS3 rate

E3MODE = 0, LBO = 0, STS-1 rate

0.9 1.0

0.97

0.80

0.95

0.78

1.1

0.85

Vpeak

Pulse Symmetry

(Positive/Negative pulse

amplitude ratio)

E3MODE = 1, E3 rate

All other modes

0.95

0.9

1.0

1.05

1.1

V/V

Input impedance TMONP, TMONM 7.5 10 12.5 kΩ

Input voltage range TMONP, TMONM to ground 0 —TVDD V

Input pulse threshold (TMONP – TMONM) ±0.3 ±0.5 ±0.7 V

TLOS asserted Number of TCLKs with no input

pulse

30 32 34 # TSYM

Figure 2-14. Test Setup for Measurement of Output Pulse Amplitude

Ω

TLINEP

TLINEM

TMONP

TMONM

31.6

Ω

31.6 1:1

75 Ω

2.0 Functional Description M28331/M28332/M28333 (–3x)

2.10 Transceiver Specification Tables Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

2-26 Mindspeed Technologies™28333-DSH-003-A

Table 2-11. Intrinsic Jitter Specifications (Receiver to Transmitter using Remote Loopback)

Parameter Conditions Min Nom Max Units

DS3 Wideband 10 Hz-400 kHz 0.010

0.003

UI peak-peak

UI rms

DS3 Narrowband 30 kHz-400 kHz 0.002

0.001

UI peak-peak

UI rms

E3 Wideband 10 Hz-800 kHz 0.060

0.007

UI peak-peak

UI rms

E3 Narrowband 10 kHz-800 kHz 0.056

0.007

UI peak-peak

UI rms

28333-DSH-003-A Mindspeed Technologies™3-1

3.0 Applications

The M28331/M28332/M28333 can be used in a variety of applications.

Figure 3-1 illustrates an example of three DS3 lines being terminated by the

M28333. The data and clock are extracted and passed on to the framer chip for

further data manipulation and user interface.

It is important to employ high-frequency design techniques for the printed

board layout.

3.1 PCB Design Considerations for the M2833i

The M28333 is a mixed signal triple-port LIU device operating at frequencies up

to 51.84 MHz. This calls for a careful design of the PCB layout.

Some design considerations are outlined below.

3.1.1 Power Supply and Ground Plane

A single power plane with bulk capacitors (typically 10 µf) distributed throughout

the board will mitigate most power rail-related voltage transients. A bulk

capacitor should also be placed where the power enters the board. It is

recommended that decoupling capacitors be routed directly to each of the power

pins. It is recommended that 0.1 µf, 0.01 µf, and 0.001 µf decoupling capacitors

be used. All three values are not required on each pin, but values should be

dispersed uniformly to filter different frequencies of noise. 10 µf tantalum

capacitors should be placed on all four corners of the chip.

A continuous ground plane is the best way to minimize ground impedance. Most

ground noise is produced by the return currents and power supply transients

during switching. This effect is minimized by reducing the ground plane

impedance.

3.1.2 Component Placement

3.1.2.1 RBIAS Resistor It is important to keep the RBAIS pins quiet, as any noise coupled to these pins

affect the internal references. The RBIAS resistors should be placed as close as

possible to the RBIAS pins and no digital signals should be routed near the pins

or the resistors. It is recommended to guard the pin, resistor, and traces with

ground vias.

3.0 Applications M28331/M28332/M28333 (–3x)

3.1 PCB Design Considerations for the M2833i Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

3-2 Mindspeed Technologies™28333-DSH-003-A

3.1.2.2 VGG Decoupling It is recommended that the VGG pin be decoupled with a 0.1 µf, 0.01 µF and

0.001 µf capacitors. These capacitors should be placed close to the VGG pin.

3.1.2.3 Termination

Resistors and Capacitors

The termination resistors and capacitors on the receive RLINE pins should be

placed as close the receiver input on the chip as possible. The series resistors for

the transmit TLINE pins should also be placed as close to the transmitter output

pins as possible, but are less of a priority then the RLINE.

3.1.3 Impedance Matching

It is critical that both the transmit and receive traces around the transformers and

the matching resistors be kept to a minimum length and that the trace impedance

be matched to 75 ohms.

The transmit signals between the device and the transformer should be routed 75

ohm differentially. The transmit signals should be routed single ended between

the transformer and the BNC connector.

The receive signals should be routed differentially between the transformers and

either differentially or single ended from the transformers to the BNC connectors,

depending on the application. If the application requires ground termination it is

recommended that the signals be routed single ended. If the application does not

require ground termination, then the signals can be routed differentially.

To route signals differentially, the signal pair (positive and negative) should be 75

ohm coupled and should be surrounded by solid power/ground planes (buried

strip line) or be coupled to a power/ground plane (microstrip). Buried strip line is

recommended for internal layers while microstrip line is used for signals routed

on surface layers. There should be no discontinuity in the planes during the path

of the signal traces.

Single ended signals should be 75 ohm coupled between power/ground planes for

inner layers or 75 ohm coupled to a power/ground plane on the outer layers.

There should be no discontinuities in the power/ground planes over the trace path.

Impedance discontinuities occur when a signal passes through vias and travels

between layers. It is recommended to minimize the number of vias and layers

that the transmit/receive signals travel through in the design.

3.1.4 Other Passive Parts

Mindspeed recommends the use of 1:1 transformers for coupling the BNC

connectors to the device. The M28333 EVM uses six Pulse T3001 transformer

devices to handle the 3 Tx and 3 Rx channels.

It is recommended that a 220 µF tantalum capacitor be used where the power

enters the board.

3.1.5 IBIS Models

IBIS (Input/Output Buffer Interface Specification) models for the

M28331/M28332/M28333 are available from Mindspeed’s web site

(www.mindspeed.com).

M28331/M28332/M28333 (–3x) 3.0 Applications

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit 3.1 PCB Design Considerations for the M2833i

28333-DSH-003-A Mindspeed Technologies™3-3

3.1.6 Recommended Vendors

Product: Transformers Product: Crystals

America

Address:

Telo:

Fax:

Pulse

Corporate Office

12220 World Trade Drive

San Diego, CA 92128

858-674-8100

858-674-8262

Telo:

Fax:

E-mail:

Web site:

Crystek Corp.

12730 Commonwealth Drive

Fort Myers, FL 33913

800-237-3061

941-561-1025

sales@crystek.com

www.crystek.com

Northern Asia

Telo:

Pulse

3F-4, No. 81, Sec. 1

Hsin Tai Wu Road

Hsi-Chih

Tapei Hsien, Taiwan

R.O.C.

886-2-26980228

886-2-26980948

Northern Europe

Telo:

Fax:

Pulse

1S2 Huxley Road

The Surrey Research Park

Guildford, Surrey GU2 5RE

United Kingdom

44-1483-401700

44-1483-401701

3.0 Applications M28331/M28332/M28333 (–3x)

3.1 PCB Design Considerations for the M2833i Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

3-4 Mindspeed Technologies™28333-DSH-003-A

Figure 3-1. DS3/E3 Application Diagram

NOTE(S):

1. All transformers are part number T3001 from Pulse Technology. See Recommended Vendors, Section 3.1.6.

2. TMONP and TMONM are only available on the M2833i-3x device and are denoted by dotted lines.

TPOS

TNEG

TCLK

TLINEP

TLINEN

RLINEP

RNEG RLINEN

RPOS

RCLK

MODE BIAS RESET

Channel 1

M28333

Framer

37.4

31.6

0.01 µF

1:1

Type 728, 734, 735

TPOS

TNEG

TCLK TLINEN

RLINEP

RNEG RLINEN

RPOS

RCLK

MODE BIAS RESET

Channel 2

TLINEP

TMONP

TMONM

TMONP

TMONM

TMONP

TMONM

Framer

37.4

31.6

0.01 µF

1:1

Type 728, 734, 735

TPOS

TNEG

TCLK TLINEN

RLINEP

RNEG RLINEN

RPOS

RCLK

MODE BIAS RESET

Channel 2

Framer

37.4

31.6

0.01 µF

1:1

Type 728, 734, 735

MODE BIAS RESET

RBIAS 12.1 K

Mode/Status Pins

100985_009

28333-DSH-003-A Mindspeed Technologies™A-1

Appendix A: Applicable Standards

The applicable standards documents are as follows:

•ANSI T1.102-1993 (DS3 and STS-1 standard)

•ANSI T1.404a-1996 (DS3 metallic interface)

•ITU Recommendation G.703 (DS3 and E3 standard)

•ITU Recommendation G.823 and G.824 (jitter and wander)

•Bellcore GR499, Issue 1, 12/89 (formerly TR-TSY-000499)

(DS3 and STS-1 requirements)

•Bellcore GR253, Issue 2, 12/91 (formerly TA-NWT-000253)

(STS-1 Requirements and Jitter)

•Bellcore TR-TSY-000191, Issue 1, 5/86 (AIS and LOS)

•ETSI TBR24 and TBR25 (E3 terminal equipment interface)

•ETSI ETS 300 686 and ETS 300 687 (E3 standard)

•AT&T Technical Reference TR54014, May 1992 (Accunet Interface

Specification for DS-3 jitter only)

•ETSI ETS 300 687, 1996, “Business Telecommunications; 34 Mbps Digital

Leased Lines (D34U and D34S); Connection Characteristics”

•ETSI ETS 300 686, 1996, “Business Telecommunication; 34 Mbps and 140

Mbps digital Leased Lines (D34U, D34S, D140U, and D140S); Network

Interface presentation”

•ANSI T1.102-1993, “Digital Hierarchy—Electrical Interfaces”

•ANSI T1.107-1995, “Digital Hierarchy—Formats Specification”

•ANSI T1.231-1997, Draft, “Digital Hierarchy—Layer 1 In-Service Digital

Transmission Performance Monitoring”

•ANSI T1.231-1993, “Digital Hierarchy—Layer 1 In-Service Digital

Transmission Performance Monitoring”

•ANSI T1.404-1994, “Network-to-Customer Installation—DS3 Metallic

Interface Specification”

•Bellcore GR-499-CORE, Issue 1, December 1995, “Transport Systems

Generic Requirements (TSGR): Common Requirements”

•Bellcore GR-253-CORE, Issue 2, December 1995, “SONET Transport

Systems: Common Generic Criteria”

•ITU Recommendation G.703, 1991, “Physical/Electrical Characteristics of

Hierarchical Digital Interfaces”

•ITU Recommendation G.823, 1993, “The Control of Jitter and Wander

Within Digital Networks Which are Based on the 2,048 kbps Hierarchy”

•ITU Recommendation O.151, 1992, “Error Performance Measuring

Equipment Operating at the Primary Rate and Above”

•ETSI TBR 24, 1997, “Business Telecommunication; 34 Mbps Digital

Unstructured and Structured Lease Lines; Attachment Requirements for

Terminal Equipment Interface”

Appendix A: Applicable Standards M28331/M28332/M28333 (–3x)

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

A-2 Mindspeed Technologies™28333-DSH-003-A

28333-DSH-003-A Mindspeed Technologies™B-1

Appendix B: Exposed Thin Quad Flat

(ETQFP) Pack

NOTE: Mindspeed recommends that the exposed paddle on the M28333–3x be

soldered to the ground side of the PCB for reasons described below. Do

not route PCB traces or vias under the exposed paddle area of the

M28333–3x device.

The Exposed Thin Quad Flat Pack (ETQFP) package provides greater design

flexibility and increased thermal efficiency, while using a standard size IC

package. The exposed pad improves performance by permitting higher clock

speeds, more compact systems, and a more aggressive design criteria. ETQFP

thermal performance is better than standard packages; however, to make

optimum use of the thermal efficiencies designed into the ETQFP, the PCB must

be designed with this package in mind. The following sections of this document

provide more information regarding the thermal performance and PCB design for

Mindspeed ETQFPs.

Appendix B: Exposed Thin Quad Flat (ETQFP) Pack M28331/M28332/M28333 (–3x)

B.1 Introduction Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

B-2 Mindspeed Technologies™28333-DSH-003-A

B.1 Introduction

The ETQFP is implemented using a standard epoxy-resin package mold

compound. The integrated circuit die is attached to the lead-frame die pad with a

thermally conductive epoxy. The leadframe is designed with a deep downset of

the die attach pad so it will be exposed on the bottom surface of the package after

mold. This provides an extremely low thermal resistance between the IC junction

and the exterior of the surface.

The die pad’s external surface can be attached to the PCB using standard

solder reflow techniques. This allows efficient attachment to the board, and

permits the board structure to be used as a heat sink for the IC. Using thermal

vias, the lead frame die pad can be attached to a ground plane or special heat sink

structure designed into the PCB. Figure B-1 illustrates the schematic of the

package components.

Figure B-1. Schematic Representation of the Package Components

100998_030

Lead Frame

Mold Compound Die

Die Attach

M28331/M28332/M28333 (–3x) Appendix B: Exposed Thin Quad Flat (ETQFP) Pack

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit B.2 Package Thermal Characterization

28333-DSH-003-A Mindspeed Technologies™B-3

B.2 Package Thermal Characterization

B.2.1 Heat Removal Path

The internal heat removal path is designed to transfer heat from the top surface of

the die to the die pad and then directly to the Printed Circuit Board (PCB) through

a center solder pad. The PCB must have features designed to remove heat from

the package efficiently. At a minimum, there must be an area of solder-tinned

copper underneath the ETQFP, called a thermal land. Heat is transferred from the

thermal land to the environment through thermal vias designed within the PCB

structure.

B.2.2 Thermal Lands

A thermal land is required on the surface of the PCB directly under the body of

the exposed package. During normal surface mount reflow, the exposed pad on

the underside of the package will be soldered to this thermal land creating an

efficient thermal path. The size of the thermal path is as large as needed to

dissipate the required heat.

For double-sided PCBs having no internal layers, the surface layers must be

used to remove heat. Figure B-2 illustrates a sample package detail, including the

required solder mask and thermal land pattern for an EQTFP. The designer may

consider external means of heat conduction, such as attaching the copper planes

to a convenient chassis member or other hardware convection.

Figure B-2. Package and PCB Land Configuration

PCB Center Pad = Body Size - 2.0 mm

Thermal Via x N,

0.33 mm Dia.

Via Dia. + 0.1 mm

Mask Opening, F sq.

Metalization Pattern

Comp Side Solder Mask

Comp Side

100998_024

Appendix B: Exposed Thin Quad Flat (ETQFP) Pack M28331/M28332/M28333 (–3x)

B.2 Package Thermal Characterization Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

B-4 Mindspeed Technologies™28333-DSH-003-A

An array of 0.33 mm diameter thermal vias plated with 1 oz. copper must be

placed on the pad and shorted to the PCB’s ground plane. If the plating thickness

in the exposed region of the center pad is not sufficient to effectively plug the

barrel of the via when plated, use solder mask to cap the vias; the mask diameter

should have a dimension equal to the via diameter + 0.1 mm minimum. This

prevents the solder from wicking through the thermal via, potentially creating a

solder void in the region between the package bottom and the center pad on the

surface of the PCB. Table B-1 lists the dimensions for the entire ETQFP package

family.

Table B-1. Dimensional Parameters (mm)

Package Type A B C D E F N(1)

48-lead ETQFP 5.40 5.40 0.50 0.25 1.00 4.70 sq. 3 x 3; 9

80-lead ETQFP 14.40 14.40 0.65 0.35 1.00 6.50 sq. 7 x 7; 49

100-lead ETQFP 14.40 14.40 0.50 0.25 1.00 8.00 sq. 7 x 7; 49

NOTE(S):

(1) N represents the total number of thermal vias to be placed evenly across the entire PCB center pad. In the case of the 48-lead

ETQFP, all thermal vias are located within the exposed region of the center pad.

M28331/M28332/M28333 (–3x) Appendix B: Exposed Thin Quad Flat (ETQFP) Pack

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit B.2 Package Thermal Characterization

28333-DSH-003-A Mindspeed Technologies™B-5

B.2.3 PCB Design

Thermal vias are the primary method of heat transfer from the PCB thermal land

to the internal copper planes or to other heat removal sinks. The number, size, and

construction of the vias is important in obtaining the best package thermal

performance and package/PCB assembly. Thermal performance analysis

indicates there is a point of diminishing returns where additional vias will not

improve heat transfer through the board.

The PCB internal structure plays a very important role in package thermal

performance. Figures B-3 and B-4 illustrate the PCB structure for a two- and

six-layer design, respectively. PCB designs with more than two layers should

have all thermal vias connected to the ground plane.

Figure B-3. Internal Structure for a Two-Layer PCB

100998_029

1/2 Oz Copper Layer

60 Micron Solder Mask Layer

1.50 mm

Core Laminate LayerThermal Via

1/2 Oz Copper Layer

Figure B-4. Internal Structure For a Six-Layer PCB

Core Laminate Layer

Thermal Via

Electrical Isolation

100998_028

1/2 Oz Copper Layer

60 Micron Solder Mask Layer

1 Oz Copper Layer

1 Oz Copper Layer 1.50 mm

1 Oz Copper Layer

1/2 Oz Copper Layer

Appendix B: Exposed Thin Quad Flat (ETQFP) Pack M28331/M28332/M28333 (–3x)

B.2 Package Thermal Characterization Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

B-6 Mindspeed Technologies™28333-DSH-003-A

B.2.4 Thermal Test Structure

B.2.4.1 Test

Environment

Package thermal performance has been tested following JEDEC standards. The

ETQFP package is mounted at the center of a 100 mm × 100 mm, six layer test

board and is tested under different air flow velocities. Figure B-5 illustrates the

system configuration.

B.2.4.2 Thermal Test

Boards

Two different test boards have been used to evaluate package thermal

performance for both worst and best conditions. Table B-2 lists specifications of

these test boards.

Figure B-5. Test Performance Structure (A = 100 mm, B = 100 mm, LP = 1.40 mm, LB = 1.60 mm)

100998_027a

Air Flow

Table B-2. Specification for a Two-Layer Test Board

Drawing Number TR03-T1

Substrate Material FR-4

Thickness 1.6 mm

Stackup (signal layers, Cu planes) 1S0P

Cu Coverage (signal layer—top/bottom) 10%

Cu Coverage (power/ground layer) 100%

Inner Cu Thickness (spec) 35 x 3.5

Table B-3. Specification for a Four-Layer Test Board

Drawing Number TR03-T2

Substrate Material FR-4

Thickness 1.6 mm

Stackup (signal layers, Cu planes) 1S2P

Cu Coverage (signal layer—top/bottom) 10%

Cu Coverage (power/ground layer) 100%

Inner Cu Thickness (spec) 35 x 3.5

M28331/M28332/M28333 (–3x) Appendix B: Exposed Thin Quad Flat (ETQFP) Pack

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit B.2 Package Thermal Characterization

28333-DSH-003-A Mindspeed Technologies™B-7

B.2.5 Package Thermal Performance

B.2.5.1 Calculation

Guidelines

Maximum junction temperature can be calculated as:

Tj = P x θ ja + Ta

Where:

θ ja = Equivalent Package Thermal Resistance (C/W)

Tj= Maximum Junction Temperature (C)

Ta= Ambient Temperature (C)

P = Package Total Power Dissipation Value (W)

B.2.5.2 Package

Thermal Resistance

Delco thermal test chips are used to estimate package thermal performance.

Table B-4 lists thermal die specifications.

Figure B-6 illustrates package thermal resistance as a function of airflow velocity

for a 48-pin ETQFP package using two different test boards, specified in

Tables B-2 and B-3, and a prediction for a six-layer PCB design. Figures B-7 and

B-8 illustrates the similar information for a 64- and 80-pin ETQFP package.

Table B-5 lists the test condition for each package type.

Table B-4. Specification for Delco Thermal Test Chips

Dimensions 3.81 mm x 3.81 mm 6.35 mm x 6.35 mm 7.8 mm x 7.8 mm

Thickness 0.33 mm 0.45 mm 0.5 mm

Figure B-6. Package Thermal Resistance as a Function of Airflow Velocity for a 48-ETQFP Package

0 50 100 150 200 250 300 350 400 450 500

Air Flow Velocity (LFM)

Package Thermal Resistance

Two Layer PCB

Four Layer PCB

Six Layer PCB

100998_031

Appendix B: Exposed Thin Quad Flat (ETQFP) Pack M28331/M28332/M28333 (–3x)

B.2 Package Thermal Characterization Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

B-8 Mindspeed Technologies™28333-DSH-003-A

Table B-5 lists the test conditions for Figures B-6 through B-8.

Table B-5. Test Conditions

Package Type: 48 EQTFP 64 ETQFP 80 ETQFP

Body Size 7 mm x 7 mm 10 mm x 10 mm 14 mm x 14 mm

Die Size 3.81 mm x 3.81 mm 6.35 mm x 6.35 mm 7.8 mm x 7.8 mm

Die Pad Size 5 mm x 5 mm 7.50 mm x 7.50 mm 9.50 mm x 9.50 mm

Figure B-7. Package Thermal Resistance as a Function of Airflow Velocity for an 64 ETQFP

0 50 100 150 200 250 300 350 400 450 500

Air Flow Velocity (LFM)

Package Thermal Resistance

Two Layer PCB

Four Layer PCB

Six Layer PCB

100998_032

Figure B-8. Package Thermal Resistance as a Function of Airflow Velocity for an 80 ETQFP

0 50 100 150 200 250 300 350 400 450 500

Air Flow Velocity (LFM)

Package Thermal Resistance

Two Layer PCB

Four Layer PCB

Six Layer PCB

100998_033

M28331/M28332/M28333 (–3x) Appendix B: Exposed Thin Quad Flat (ETQFP) Pack

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit B.3 Solder Stencil Determination

28333-DSH-003-A Mindspeed Technologies™B-9

B.3 Solder Stencil Determination

Use the thickest possible solder mask, consistent with the components being

assembled to the PWB surface mount process. A standoff height of 2.0–4.2 mils

provides good solder joints for both the leads and the center pad. This is achieved

using a stencil thickness of 5, 6, or 7 mils.

B.4 Solder Reflow Profile

The ETQFP uses the standard TQFP reflow profile because the ETQFP package

construction does not add thermal mass. There is minimal additional thermal load

due to the increased solder area between the exposed die pad on the package and

the center pad on the PCB. Figures B-9 and B-10 illustrate typical IR reflow

profiles for Sn63:Pb37 solder in the cases of natural convection and forced

convection ovens.

Appendix B: Exposed Thin Quad Flat (ETQFP) Pack M28331/M28332/M28333 (–3x)

B.4 Solder Reflow Profile Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

B-10 Mindspeed Technologies™28333-DSH-003-A

Figure B-9. Typical IR Reflow Profile for Eutectic Sn63:Pb37

100998_025

NOTE(S):

Peak temperature should be approximately 220 ˚C, and the exposure time should normally be less

than 1.0 minutes at temperature above 183 ˚C.

300

270

240

210

180

150

120

Temperature (˚C)

12345 678910

0.0

219Peak: Max Slope: –3.2 Seconds Over 183: 48 Time

Minute 0.6

160

265

125

260

115 4

110

ZONE SETPOINTS

190 6

190 8

190

160

1.2 1.9 2.5 3.1 3.7 4.4

Belt Speed = 38.00 inches/minute

M28331/M28332/M28333 (–3x) Appendix B: Exposed Thin Quad Flat (ETQFP) Pack

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit B.4 Solder Reflow Profile

28333-DSH-003-A Mindspeed Technologies™B-11

Peak temperature should be approximately 235 °C, and the exposure time should

normally be less than 1.2 minutes at temperature above 183 °C. Belt Speed = 30

inches/minute (top and bottom setting), FAN SPEED = 2500 RPM, NITROGEN

LEVEL = 1200 SCFH.

Figure B-10. Typical Forced Convection Reflow Profile for Eutectic Sn63:Pb37

2470

1700

920

150

100998_026

File = SMOLE42

TWO2 - D675-001

MAXIMA

1= 221

2 = 225

3 = 227

4 = 226

Deg.

236.7

236.1

232.3

233.3

MAX SLOPES

1= 27

2 = 33

3 = 31

4 = 32

5 = 0

Deg./Point

4.4

6.7

9.4

0.0

Thermocouple Location

1 = BOTTOM GROUND

2 = TQFP4B

3 = BBA

4 = MCM

F1–F4 = Sample 1–4;

Temp

35.0

36.7

32.8

33.9

OPEN

F5 - ReScale X:

Slope

1.1

0.0

SAMP 1 X = ?3 SAMP 2 X = 67 SAMP 3 X = 182 SAMP 4 X = 244

Temp

147.2

157.8

153.9

160.0

OPEN

F6 - ReScale Y:

Slope

1.1

0.9

1.7

1.1

0.0

Temp

185.6

186.7

182.2

183.3

OPEN

F7 = PRINT:

Slope

1.1

1.7

1.1

0.0

Temp

185.0

181.1

187.8

182.2

OPEN

Msc = Menu:

Slope

–2.2

–4.4

–2.8

–3.3

0.0

+X----->

STATUS–3

TEMP = 68

BATT = 5.893

P1s = 350

Act = X4321

00:00:01.0

04/29/98

12:00:08

ZONE 1 = 185 °C ZONE 2 = 185 °C ZONE 3 = 175 °C ZONE 4 = 175 °C

ZONE 5 = 180 °C ZONE 6 = 190 °C ZONE 7 = 230 °C ZONE 8 = 270 °C

Appendix B: Exposed Thin Quad Flat (ETQFP) Pack M28331/M28332/M28333 (–3x)

B.4 Solder Reflow Profile Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

B-12 Mindspeed Technologies™28333-DSH-003-A

28333-DSH-003-A Mindspeed Technologies™C-1

Appendix C: Power Sequencing

When VGG is operated at 5V, use the power-up and power-down sequencing

between VGG and VDD (DVDDC, RVDD, TVDD, VDD) as described in the

diagrams below (refer to note below).

NOTE: VGG can exceed VDD by up to 5V (±10%) for short durations of less than 10 ms.

VGG must never be less than VDD by more than 0.5V.

Figure C-1. Power -up sequence of VGG and VDD.

VGGmax

VDD

VGGmin

VSS

3.6V Max.

0.5V Max.

3.6V Max.

Time

3.6V Max.

5.5V Max.

Figure C-2. Power-down sequence of VGG and VDD.

VGGmax

VDD

VGGmin

VSS

3.6V Max.

0.5V Max.

3.6V Max.

Time

3.6V Max.

5.5V Max.

Appendix C: Power Sequencing M28331/M28332/M28333 (–3x)

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

C-2 Mindspeed Technologies™28333-DSH-003-A

www.mindspeed.com

General Information:

U.S. and Canada: (800) 854-8099

International: (949) 483-6996

Headquarters - Newport Beach

4311 Jamboree Rd. P.O. Box C

Newport Beach, CA. 92658-8902