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Zarlink Semiconductor Inc.

Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.

Copyright 1997-2005, Zarlink Semiconductor Inc. All Rights Reserved.

Features

• Zarlink ST-BUS compatible

• 8-line x 32-channel inputs

• 8-line x 32-channel outputs

• 256 ports non-blocking switch

• Single power supply (+5 V)

• Low power consumption: 30 mW Typ.

• Microprocessor-control interface

• Three-state serial outputs

Description

This VLSI ISO-CMOS device is designed for switching

PCM-encoded voice or data, under microprocessor

control, in a modern digital exchange, PBX or Central

Office. It provides simultaneous connections for up to

256 64 kbit/s channels. Each of the eight serial inputs

and outputs consist of 32 64 kbit/s channels

multiplexed to form a 2048 kbit/s ST-BUS stream. In

addition, the MT8980 provides microprocessor read

and write access to individual ST-BUS channels.

February 2005

Ordering Information

MT8980DE

40 Pin PDIP

Tubes

MT8980DP

44 Pin PLCC

Tubes

MT8980DPR

44 Pin PLCC

Tape & Reel

MT8980DP1

44 Pin PLCC*

Tubes

MT8980DE1

40 Pin PDIP*

Tubes

MT8980DPR1

44 Pin PLCC*

Tape & Reel

*Pb Free Matte Tin

-40

°C to +85°C

MT8980D

Digital Switch

Data Sheet

Figure 1 - Functional Block Diagram

STo0

STo1

STo2

STo3

STo4

STo5

STo6

STo7

Serial

to

Parallel

Converter

Data

Memory

Frame

Counter

Control Register

Control Interface

Output

MUX

Connection

Memory

Parallel

to

Serial

Converter

CS R/W A5/

A0

DTA D7/

D0

CSTo

C4i

F0i

ODE

STi0

STi1

STi2

STi3

STi4

STi5

STi6

STi7

DS