MTC-20276
Integrated NT (INTQ)
for Basic Rate ISDN (2B1Q)
Key Features:
▼ ISDN basic rate NT functions in
a single chip
▼U and S/T interfaces in one
device
▼ Minimal external components
▼ 3.3V operating voltage
▼ 300mW power consumption
▼ Pin compatible 2B1Q and
4B3T line code versions
* MTC-20276 INTQ for 2B1Q
* MTC-20277 INTT for 4B3T
▼ Stand-alone mode for stan-
dard NT1 applications
▼ GCI bus interface for
advanced functions
▼ Flashing LED status indicator
(2BIQ Version)
▼ -40°C to + 85°C or 0°C to 70°C
(option)
▼ 44 pin Plastic Quad Flat Pack
package
Applications
▼ Line powered ISDN NT
▼ Small ISDN PABX
▼ NT plus
▼ Data Network Gateways
▼ Pair gain
▼ NMDS
▼ CTI Systems
Product Brief
Fig. 1: INT General block diagram
‘U’ interface
‘S’ interface
Digital Expansion and Test logic
Crystal
Oscillator
Power-on
Reset
TX
TX
RX
RX
JTAG
test
access
SPI and
Aux. test
access
Analog
Support
Functions
(S-bus mode)
Power / Ground and Analog Test
General Description
The MTC-20276/7 chip contains all
the functions necessary to make an
ISDN Network Termination module. It
comprises a fully integrated 'U'-inter-
face, an 'S'-interface, plus the neces-
sary support functions. The general
block diagram is shown in Figure 1.
Two versions of the device are avail-
able - the MTC-20276 offering the
2B1Q line code on the ‘U’ interface,
and the MTC-20277 which has 4B3T
line coding. The two devices are pin
compatible, and are fully compliant
with the relevant parts of ETSI, FTZ
and ITU requirements for ISDN con-
nections.
The MTC-20276/7 devices offer a
user transport rate of 144kbit/s full
duplex (2B + D), as well as fully auto-
matic control of activate/deactivate
protocols and full support of the main-
tenance channel.
The devices are fabricated in Alcatel
Microelectronics’ advanced 0.5µ
CMOS mixed digital/ analog process
and operate with a single 3.3V sup-
ply voltage.
A GCI bus interface supports expand-
ed features including data ports and
A/B (POTS) analog ports.
MTC-20277
Integrated NT (INTT)
for Basic Rate ISDN (4B3T)
Ordering Information
Part number Package Code Temp.
MTC-20276PQ-I 44 pin PQFP PQ44 -40/+85°C
MTC-20276PC-I 44 pin PLCC PC44 -40/+85°C
MTC-20276PQ-C 44 pin PQFP PQ44 0/+70°C
MTC-20276PC-C 44 pin PLCC PC44 0/+70°C
MTC-20277PQ-I 44 pin PQFP PQ44 -40/+85°C
MTC-20277PC-I 44 pin PLCC PC44 -40/+85°C
MTC-20277PQ-C 44 pin PQFP PQ44 0/+70°C
MTC-20277PC-C 44 pin PLCC PC44 0/+70°C
The INT uses the ARM7TDMI
processor core
from ARM Ltd, UK
2
MTC-20276 INTQ
MTC-20277 INTT
NT and Extended NT
Functions (“NTplus”)
The MTC-20276/7 has dual GCI
interface, which operates in one of
two modes.
In Mode 0 (GMode = logic 0), the
GCI port allows the data flow
between the 'U' and the 'S' ports to
be optionally monitored.
This is the “stand alone” mode, which
is the normal mode for simple NT1
applications. No additional micro-
processor or other control device is
required in this mode.
Mode 1 (GMode = logic1) allows
separate access to the 'U' and the 'S'
ports, for use by an external GCI com-
patible controller device. In this mode,
the chip supports additional features
required by extended NT modules
such as interfaces to existing analog
equipment, or advanced data commu-
nication gateways.
Figure 2 shows the circuit configura-
tion of the MTC-20276/7 in its stand
alone mode, for conventional NT1
applications.
Figure 3 shows the system concept of
an MTC-20276/7 in an “NT1+”
application, in combination with the
Alcatel Microelectronics MTK-40130
“SH-POTS” chipset for short-haul ana-
log telephone lines and one of Alcatel
Microelectronics’ Controllers for ISDN
Terminals (e.g. MTC-20270 or MTC-
20280).
When using the MTC-20276 in a
2B1Q NT module, two test pins AUX1
and AUX2 are used to flag the status
of the power supplies to the module:
AUX1 (PW220) is used to indicate the
presence of a mains or other local
supply voltage (1 = local supply avail-
able), and AUX2 (PW40) is used to
indicate the presence of a supply volt-
age from the 'U' interface line (40V
nominal, 1 = line power available).
To ensure pin compatibility between
the 2B1Q and 4B3T versions, these
pins are ignored in the MTC-20277
for 4B3T NT modules.
The MTC-20276 INTQ also provides
fully automatic handling of the Embed-
ded Operations Channel.
3
MTC-20276 INTQ
MTC-20277 INTT
Fig. 2: INT - Single-chip NT1 external component configuration
Pin Description
4
MTC-20276 INTQ
MTC-20277 INTT
No* Function Name Dir. Description
44 LOUT1 O U interface analog outputs. The connections LOUT1 and LOUT2 interface
1 LOUT2 O the U driver outputs, via termination resistors and the line coupling
U transformer, to the UK0 reference point.
3 LIN1 I U interface analog inputs to the INT from the analog ‘hybrid’
4 Int. LIN2 I
2 AREF O Analog ground (1.65V ± 3%). Used as reference voltage for analog functions
ADC and DAC
43 AVDD P VDD for analog U interface functions + 3.3V ± 5%
42 AVSS P VSS (0V ground) for U interface analog functions
33 SXP O S interface analog outputs. SXP and SXN interface the S-driver outputs
32 SXN O via terminating resistors and the TX line coupling transformer to the S0
reference point (Tx).
31 S SRP I S interface analog inputs. SRP and SRN interface the S inputs via a line
30 SRN I coupling transformer to the S0 interface point (Rx).
37 Int. SBUS I S-bus type configuration. 1 = short bus with fixed timing, 0 = adaptive
timing for extended bus or point-to-point
34 SATP O Analog test pin. Used for test purposes only, should be left open circuit
36 AVDD P VDD for analog S interface functions + 3.3V ± 5 %
35 AVSS P VSS (0V ground) for S interface analog functions
12 G1DOUT O Primary GCI interface G1:
13 G1DIN I/O GMODE = 0 : Monitoring of the internal GCI between the U and S.
Fig. 3: Concept of an NT1+ Configuration for 2 Analog Lines
5
MTC-20276 INTQ
MTC-20277 INTT
14 GCI G1DCLK O GMODE = 1 : NTplus mode; complete GCI connected to U with U as master.
15 G1DFR O G1DOUT = data output
G1Din = data input (output direction in monitoring mode)
G1DCLK = 512 KHz GCI clock
G1DFR = 8KHz GCI frame clock which identifies the beginning of the
frame of G1DIN and G1DOUT
18 Int. G2DOUT O Secondary GCI interface G2:
19 G2DIN I GMODE = 0 : No function
20 G2DCLK O GMODE = 1 : NTplus mode; complete GCI connected to S with external master.
21 G2FR O G2DOUT = data output
G2DIN = data input
G2DCLK = 512KHz GCI clock
G2DFR = 8KHz GCI frame clock which identifies the beginning of the
frame of G2DIN and G2DOUT
Remark : if NT Plus mode not used, the inputs have to be strapped
high or low.
22 GMODE I Select NTplus mode. 0 = monitoring mode, 1 = NTplus mode.
5 TRST I TAP controller reset, active low
6 JTAG TCK I TAP controller clock, maximum 10 MHz
7 TMS I TAP controller mode selection
8 INT. TDI I TAP controller input
9 TDO O TAP controller output
41 NRESET I Hardware reset, active low. Schmitt trigger input for connection to
external RC or logic device. Reset pulse min. 10ms. (threshold 1.65V CMOS level)
25 XTAL1 I Connection to external crystal (15.36MHz ± 100ppm loading caps 2x22pF)
24 XTAL2 I Connection to external crystal. May also be used as input for external
master clock source.
40 TSP I Test Single Pulses. INT transmits alternate positive and negative pulses
to act as test and search-tone on the line. Pulse repetition 1KHz at ‘U’ interface.
39 AUX1/ MTC-20277. Test input only (strap to ground)
PW220 I MTC-20276. Indicate presence of 220V AC supply. 1 = 220V is ON
38 AUX2/ MTC-20277. Selection between S block mode 1 = normal (2080)
0 = advanced (2081)
PW40 I MTC-20276. Indicate presence of 40V power from line. 1 = 40V is ON
10 SPICK O
11 SPI SPICS O
27 Int. SPIDI/OPTO I MTC-20276. Enable/disable upstream activation request on power-up.
28 SPIDO/LED O MTC-20276. The pin LED can drive an LED (max4.0 mA) that indicates the device
status. The 4 states are on, off, 1Hz flashing and 8 Hz flashing. The other pins can
be left open.
29 AUX/CSO I Indicate cold-start-only operation mode: MTC-20276 0 = normal
1 = cold-start-only flag set
Must be strapped to ground for normal operation MTC-20277.
16 VDD P Positive supply for digital functions + 3.3V ± 5 %
26 VDD P
17 VSS P 0V ground for digital functions
23 VSS
*QFP Pin Numbers
Absolute Maximum Ratings
Operation at these limits is not guaranteed, and device reliability will be adversely effected.
Logic supply voltage (VDD, AVDD) 3.63 V
Voltage on any pin (except GCI) VDD+0.3 V
VSS-0.3 V
Voltage on GCI interface pins 6 V
Continuous power dissipation 1 W at 25 °C ambient
Storage temperature -55 to +150 °C for < 100 hours
-55 to +100 °C for > 100 hours
Operating Ranges
VDD, AVDD 3.15 to 3.45V (= 3.3V ± 5%)
Supply noise (p-p): ≤100mV on VDD
≤10mV on AVDD
≤0.1mV on AREF
AREF output voltage 1.65V ± 3%
Max current on AREF + or - 0.25 mA
Power consumption 320 mW TYP. in power-up state, at maximum Vdd
nominal loads on S and U interfaces, random signals:
U: 150Ωline equivalent
S: 100Ωline equivalent
≤20mW in power-down state
Crystal frequency 15.36 MHz ± 50ppm. Parallel mode NT cut crystal, loading capacitors
2 x 22 pF. External master clock may be applied to XTAL2.
Temperature range -40 to +85 °C (-I suffix)
0 to 70 °C (-C suffix)
Reliability Information
Early failure rate ≤0.3% at 3000 hours
Long term failure rate ≤300 FIT for 45°C average ambient and 45% average humidity
Lifetime ≥15 years
MTC-20276 INTQ
MTC-20277 INTT
10/98-PB219f
Alcatel Microelectronics acknowledges the trademarks of all companies referred to in this document.
This document contains information on a new product.
Alcatel Microelectronics
reserves the right to make
changes in specifications at any time and without notice.
The information furnished by
Alcatel Microelectronics
in this
document is believed to be accurate and reliable.
However, no responsibility is assumed by
Alcatel Micro-
electronics
for its use, nor for any infringements of patents or
other rights of third parties resulting from its use.
No licence is granted under any patents or patent rights
of
Alcatel Microelectronics
.
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