SY89834UMGTR - Micrel Semiconductor, Inc.

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

DESCRIPTION

■Selects between two LVTTL/CMOS inputs and

provides 4 LVPECL output copies

■Guaranteed AC performance over temperature

and voltage:

• DC-to >1.0GHz throughput

• <500ps propagation delay (IN-to-Q)

• < 20ps within-device skew

• < 225ps rise/fall time

■Ultra-low jitter design:

• < 1psRMS cycle-to-cycle jitter

• < 1psRMS random jitter

• < 10psPP deterministic jitter

• < 10psPP total jitter (clock)

■Low voltage 2.5V and 3.3V supply operation

■100K LVPECL outputs

■Industrial temperature range: –40°C to +85°C

■Includes a 2:1 MUX select input

■Accepts single-ended TTL/CMOS inputs and

provides four LVPECL outputs

■Available in 16-pin (3mm × ×

× ×

× 3mm) MLF™ package

FEATURES

2.5V/3.3V TWO INPUT, 1GHz LVTTL/CMOS-

TO-LVPECL 1:4 FANOUT BUFFER/

TRANSLATOR WITH 2:1 INPUT MUX

Precision Edge®

SY89834U

APPLICATIONS

■Processor clock distribution/translation

■SONET clock distribution/translation

■Fibre Channel clock distribution/translation

■Gigabit Ethernet clock distribution/translation

■Single-ended ASIC-to-differential communication

IC signal translation

The SY89834U is a high-speed, 1GHz LVTTL/CMOS-to-

LVPECL fanout buffer/translator optimized for high-speed

ultra-low skew applications. The input stage is designed to

accept two single-ended LVTTL/CMOS compatible signals

that feed into a 2:1 MUX. The selected input is translated

and distributed as four differential 100K LVPECL outputs.

Within device skew is guaranteed to be less than 20ps over

supply voltage and temperature.

The single-ended input buffers accept TTL/CMOS logic

levels. The internal threshold of the buffers is defined as

VCC/2.

The SY89834U is a part of Micrel's high-speed Precision

Edge® family. For applications that require a different I/O

combination, consult Micrel's website at: www.micrel.com,

and choose from a comprehensive product line of high-

speed, low-skew fanout buffers, translators and clock

generators.

FUNCTIONAL BLOCK DIAGRAM

Precision Edge is a registered trademark of Micrel, Inc.

Micro

LeadFrame and MLF are trademarks of Amkor Technology, Inc.

IN1

(LVTTL/CMOS)

IN2

/Q0

/Q1

/Q2

/Q3

LVTTL/CMOS)

SEL

(LVTTL/CMOS)

MUX

1:4

Precision Edge®

August 2005

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

IN1 IN2 EN SEL Q0–Q3 /Q0–Q3

0X110 1

1X111 0

X0100 1

X1101 0

XX0X0

(1) 0(1)

Note:

1. On next negative transition of the input signal (IN).

TRUTH TABLE

PACKAGE/ORDERING INFORMATION

Ordering Information(1)

Package Operating Package Lead

Part Number Type Range Marking Finish

SY89834UMI MLF-16 Industrial 834U Sn-Pb

SY89834UMITR(2) MLF-16 Industrial 834U Sn-Pb

SY89834UMG(3) MLF-16 Industrial 834U with Pb-Free NiPdAu

bar line indicator Pb-Free

SY89834UMGTR(2, 3) MLF-16 Industrial 834U with Pb-Free NiPdAu

bar line indicator Pb-Free

Notes:

1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only.

2. Tape and Reel.

3. Pb-Free package is recommended for new designs.

Pin Number Pin Name Pin Function

15, 16 Q0, /Q0 Differential 100K LVPECL Outputs: These LVPECL outputs are the precision, low skew copies

1, 2, Q1, /Q1 of the inputs. Please refer to the “Truth Table” section for details. Unused output pairs may be

3, 4, Q2, /Q2 left open. Terminate wtih 50Ω to VCC–2V. See “Output Termination Recommendations” section

5, 6 Q3, /Q3 for more details.

8 EN This single-ended TTL/CMOS-compatible input functions as a synchronous output enable. The

synchronous enable ensures that enable/disable will only occur when the outputs are in a logic

LOW state. Note that this input is internally connected to a 25kΩ pull-up resistor and will default

to logic HIGH state (enabled) if left open.

12, IN1 Single-ended TTL/CMOS-compatible inputs to the device. These inputs are internally connected

9 IN2 to a 25kΩ pull-up resistor and will default to logic HIGH state if left open. The input threshold is

VCC/2.

10 NC No connect. Not internally connected.

11 SEL TTL/CMOS Compatible Select Input for signals IN1 and IN2. The input threshold is VCC/2. HIGH at

the SEL input selects signal IN1. LOW at the SEL input selects signal IN2. SEL includes a 25kΩ

pull-up resistor. The default state is HIGH when left floating.

13 GND Ground. GND pins and exposed pad must be connected to the most negative potential of the

device ground.

7, 14 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors and place as close to

each VCC pin as possible.

PIN DESCRIPTION

13141516

8765

/Q1

IN1

SEL

IN2

/Q0

VCC

GND

/Q3

VCC

16-Pin MLF™ (MLF-16)

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

Absolute Maximum Ratings(1)

Supply Voltage (VCC) .................................. –0.5V to +4.0V

Input Voltage (VIN) ...............................–0.5V to VCC +0.3V

LVPECL Output Current (IOUT)

Continuous .............................................................50mA

Surge....................................................................100mA

Input Current (IN1, IN2)............................................±50mA

Lead Temperature (Soldering, 20sec.), ................... 260°C

Storage Temperature (TS) .......................–65°C to +150°C

Operating Ratings(2)

Supply Voltage Range ........................ +2.375V to +2.625V

............................................................ +3.0V to +3.6V

Ambient Temperature (TA).........................–40°C to +85°C

Package Thermal Resistance(3)

MLF™ (θJA)

Still-Air .............................................................60°C/W

MLF™ (ψJB)

Junction-to-Board ............................................32°C/W

TA = –40°C to +85°C, unless otherwise stated.

Symbol Parameter Condition Min Typ Max Units

VCC Power Supply 2.375 2.625 V

3.0 3.6 V

ICC Power Supply Current No load, max. VCC.5075mA

DC ELECTRICAL CHARACTERISTICS(4)

VCC = 2.5V ±5% or VCC = 3.3V ±10%; TA = –40°C to +85°C, unless otherwise stated.

Symbol Parameter Condition Min Typ Max Units

VIH Input HIGH Voltage 2.0 V

VIL Input LOW Voltage 0.8 V

IIH Input HIGH Current IIH @ VIN = 2.7V –125 30 µA

IIL Input LOW Current –125 µA

VCC = 2.5V ±5% or VCC = 3.3V ±10% , RL = 50Ω to VCC–2V; TA = –40°C to +85°C, unless otherwise stated.

Symbol Parameter Condition Min Typ Max Units

VOH Output HIGH Voltage

–1.145 V

–1.020 V

–0.895

VOL Output LOW Voltage

–1.945 V

–1.820 V

–1.695

VOUT Output Voltage Swing See Figures 2a. 550 800 1050 mV

VDIFF_OUT Differential Output Voltage Swing See Figures 2b. 1100 1600 2100 mV

Notes:

1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied

at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions for extended

periods may affect device reliability.

2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.

3. Junction-to-board resistance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB. θJA and ΨJB values are

determined for a 4-layer board in still-air, unless otherwise stated.

4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.

LVTTL/CMOS INPUTS DC ELECTRICAL CHARACTERISTICS(4)

(100KEP) LVPECL OUTPUTS DC ELECTRICAL CHARACTERISTICS(4)

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

VCC = 2.5V ±5% or VCC = 3.3V ±10% , RL = 50Ω to VCC–2V; TA = –40°C to +85°C, unless otherwise stated.

Symbol Parameter Condition Min Typ Max Units

fMAX Maximum Frequency Input tr/t

f ≥ 350ps 1.0 GHz

tpd Propagation Delay IN-to-Q Note 6 200 320 500 ps

tSW Switchover Time SEL-to-Q 200 320 500 ps

tSKEW Within-Device Skew Note 7 5 20 ps

Part-to-Part Skew Note 8 300 ps

tJITTER Data

Random Jitter (RJ) Note 9 1 psRMS

Deterministic Jitter (DJ) Note 10 10 psPP

Clock

Cycle-to-Cycle Jitter Note 11 1 psRMS

Total Jitter (TJ) Note 12 10 psPP

DC Duty Cycle Input tr/tf ≥ 350ps, Note 13 45 50 55 %

tSSet-Up Time EN to IN1, IN Note 14 and Note 15 300 ps

tHHold Time EN to IN1, IN Note 14 and Note 15 500 ps

tr, tfOutput Rise/Fall Times 70 140 225 ps

(20% to 80%)

Notes:

5. High-frequency AC parameters are guaranteed by design and characterization.

6. VIH = 2.0V, VIL = 0.8V, 50% duty cycle. Delay measured at 100MHz from the crossing of the input signal with VCC/2 as the crossing of the

differential output signal. See Figure 1.

7. Within device skew is measured between two different outputs under identical input transitions.

8. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and no skew at the edges at the respective

inputs.

9. Random jitter is measured with a K28.7 pattern, measured at ≤fMAX.

10. Deterministic jitter is measured at 2.5Gbps with both K28.5 and 223–1 PRBS pattern.

11. Cycle-to-cycle jitter definition: The variation period between adjacent cycles over a random sample of adjacent cycle pairs.

TJITTER_CC = Tn– Tn+1, where T is the time between rising edges of the output signal.

12. Total jitter definition: with an ideal clock input frequency of ≤ fMAX (device), no more than one output edge in 1012 output edges will deviate by more

than the specified peak-to-peak jitter value.

13. If tr/tf is less than 350ps, the duty cycle distortion will increase beyond the duty cycle limits.

14. Set-up and hold times apply to synchronous applications that intend to enable/disable before the next clock cycle. For asynchronous applications

set-up and hold times do not apply.

15. See “Timing Diagrams,” Figure 1a.

AC ELECTRICAL CHARACTERISTICS(5)

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

TIMING DIAGRAMS

tpd

EN VCC/2

VIN

VOUT

VCC/2

VCC/2VCC/2VCC/2VCC/2

tpd

Figure 1a. Timing Diagram

(EN, IN1, IN2)

SWITCHOVER

SEL VCC/2 VCC/2

IN2

IN1

HIGH

LOW

VOUT

Figure 1b. Timing Diagram

(SEL)

VOUT

Figure 2a. Single-Ended Swing

DIFF_OUT

Figure 2b. Differential Swing

SINGLE-ENDED AND DIFFERENTIAL SWINGS

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

TYPICAL OPERATING CHARACTERISTICS

100

200

300

400

500

600

700

800

0 0.5 1 1.5 2 2.5 3

OUTPUT SWING (mV)

FREQUENCY (GHz)

Output Swing

vs. Frequency

200

220

240

260

280

300

320

340

360

380

400

-50 -30 -10 10 30 50 70 90

PROPAGATION DELAY (ps)

TEMPERATURE (°C)

Propagation Delay

vs. Temperature

VCC = 3.3V, GND = 0V, RL = 50Ω to VCC–2V; TA = 25°C, unless otherwise stated.

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

FUNCTIONAL CHARACTERISTICS

155MHz Output

TIME (1ns/div.)

275mV Offset

(150mV/div.)

622MHz Output

TIME (321.9ps/div.)

300mV Offset

(150mV/div.)

1GHz Output

TIME (200ps/div.)

300mV Offset

(150mV/div.)

VCC = 3.3V, GND = 0V, RL = 50Ω to VCC–2V, TA = 25°C, unless otherwise stated.

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

DIFFERENTIAL INPUT

R25k

GND

IN1

IN2

SEL

Figure 3. Simplified TTL/CMOS Input Buffer

Part Number Function Data Sheet Link

SY89830U 2.5V/3.3V/5V 2.5GHz 1:4 PECL/ECL http://www.micrel.com/product-info/products/sy89830u.shtml

Clock Driver with 2:1 Differential Input Mux

SY89831U Ultra-Precision 1:4 LVPECL Fanout Buffer/ http://www.micrel.com/product-info/products/sy89831u.shtml

Translator with Internal Termination

SY89832U 2.5V Ultra-Precision 1:4 LVDS Fanout Buffer/ http://www.micrel.com/product-info/products/sy89832u.shtml

Translator with Internal Termination

SY89833U 3.3V Ultra-Precision 1:4 LVDS Fanout Buffer/ http://www.micrel.com/product-info/products/sy89833u.shtml

Translator with Internal Termination

16-MLF™ Manufacturing Guidelines http://www.amkor.com/products/notes-papers/

Exposed Pad Application Note MLF-appnote-0301.pdf

HBW Solutions New Products + Termination App Note http://www.micrel.com/product-info/as/solutions.shtml

RELATED PRODUCTS AND SUPPORT DOCUMENTATION

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

TERMINATION RECOMMENDATIONS

82Ω

= 50Ω

+3.3V +3.3V

= V

—2V

130ΩR1

130Ω

+3.3V

Figure 4a. Parallel Termination–Thevenin Equivalent

Note:

1. For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω

For +3.3V systems: R1 = 130Ω, R2 = 82Ω

Z = 50Ω

50Ω50Ω

50Ω

+3.3V +3.3V

“source”“destination”

VCC

0.01µF

(optional)

Figure 4b. Three-Resistor “Y–Termination”

Notes:

1. Power-saving alternative to Thevenin termination.

2. Place termination resistors as close to destination inputs as possible.

3. Rb resistor sets the DC bias voltage, equal to Vt. For +3.3V systems Rb = 50Ω. For +2.5V systems Rb = 19Ω.

+3.3V +3.3V

ZO = 50Ω

82Ω

+3.3V +3.3V

130ΩR1

130Ω

82Ω

Vt = VCC —2V

1kΩ

1.6kΩ

Vt = VCC —1.3V

Figure 4c. Terminating Unused LVPECL I/O

Notes:

1. Unused output (/Q) must be terminated to balance the output.

2. For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω, R3 = 1.25kΩ, R4 = 1.2kΩ.

2. Unused output pairs (Q and /Q) may be left floating.

Precision Edge®

SY89834U

Micrel, Inc.

M9999-080505

hbwhelp@micrel.com or (408) 955-1690

16 LEAD EPAD

Micro

LeadFrame™ (MLF-16)

Package

EP- Exposed Pad

Die

CompSide Island

Heat Dissipation

Heavy Copper Plane

VEE

Heat Dissipation

PCB Thermal Consideration for 16-Pin MLF™ Package

(Always solder, or equivalent, the exposed pad to the PCB.)

Package Notes:

Note 1. Package meets Level 2 moisture sensitivity classification, and are shipped in dry-pack form.

Note 2. Exposed pads must be soldered to a ground for proper thermal management.

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com

The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.

Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can

reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into

the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s

use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify

Micrel for any damages resulting from such use or sale.