AM79D2251JC datasheet(8/35 Pages) AMD

Part #	AM79D2251JC

Description	Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC)

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Manufacturer	AMD [Advanced Micro Devices]

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Am79D2251

CS/RST

Chip Select/Reset

I

For PCM backplane operation, a logic low on this pin for 15 or more DCLK cycles resets

the sequential logic in the ISLAC device into a known mode. A logic low placed on this pin

for less than 15 DCLK cycles is a chip select and enables serial data transmission into or

out of the DIO port. For GCI operation, a logic low on this pin—for 1 ms or longer—resets

the sequential logic into a known mode. See Table 2-4 in the Technical Reference for

details. 5 V tolerant.

SHB, SLB,

SPB

Battery Sense

I

Resistors that sense the high, low and positive battery voltages connect here. If only one

negative battery is used, connect both resistors at the supply. If the positive battery is not

used, leave the pin unconnected. These pins are current inputs whose voltage is held at

VREF.

TSCA/G,

Timeslot Control A/GCI

Mode, Time Slot

Control B

O

(PCM)

I

(GCI)

For PCM backplane operation, TSCA is active low when PCM data is output on the DXA

pin. The outputs are open-drain and are normally inactive (high impedance). Pull-up loads

should be connected to VCCD. When GCI mode is selected, one of two GCI modes may

be selected by connecting TSCA/G to DGND or VCCD.

VSAB1–

VSAB2

Loop voltage sense

I

Connect to the VSAB pins of two ISLIC devices.

VCCA1–

VCCA2

Power Supply

+3.3 VDC supplies to the analog sections in each of the two channels.

VCCD

Power Supply

+3.3 VDC supply to all digital sections.

VREF

Analog Reference

O

This pin provides a 1.4 V, single-ended reference to the two ISLIC devices to which the

ISLAC device is connected.

VHL1–

VHL2

High Level D/A

O

High-level loop control voltages on these pins are used to control DC-feed, internal ringing,

metering and polarity reversal for each ISLIC device.

VIN1–

VIN2

TX Analog

I

Analog transmit signals (VTX) from each ISLIC device connect to these pins. The ISLAC

device converts these signals to digital words and processes them. After processing, they

are multiplexed into serial time slots and sent out of the DXA/DU pin.

VLB1–

VLB2

Longitudinal

Reference

O

Normally connected to VCCA internally. They supply longitudinal reference voltages to the

ISLIC devices during certain test procedures. These outputs are connected internally to

VCCA during ISLIC Active, Standby, Ringing, and Disconnect modes. During test modes,

it can be connected to the receive D/A.

VIMT1–

VIMT2,

VILG1–

VILG2

Sense

I

The IMT and ILG pins of two ISLIC devices connect to the VIMT1–VIMT4 and VILG1–

VILG4 pins of the ISLAC chip. These pins are voltage inputs referenced to VREF. They

require external resistors connected between each pin and VREF to convert IMTn and

ILGn into voltages.

VOUT1–

VOUT2

RX Analog

O

The ISLAC device extracts and processes voice data from time slots on DRA/DD serial

data port. After processing, the ISLAC device converts the voice data to analog signals

that are sent out of these pins to each respective ISLIC device.

XSB1–

XSB2

External Sense

I

External resistors connect here that sense an external voltage. In a linecard with external

ringing, they are used to sense the voltage at the line side of the ring-feed resistor. These

pins are current inputs whose voltage is held at VREF. An internal resistor converts currents

flowing in these pins into voltages to be sampled by the A/D.

XSC

Common External

Sense

I

An external resistor connects here that senses a common reference for external voltages

sensed by resistors connected to XSB1–XSB4. This pin is a current input whose voltage

is held at VREF. An internal resistor converts current flowing in this pin into a voltage to

be sampled by the A/D. This pin is intended for sensing external ringer supply voltages.

However, it can also be used to sense other test points when internal ringing is used.

Pin Name

I/O

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