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MH8980DE

ISO-CMOS ST-BUS™ FAMILY Digital Switch

Mitel Networks 

ISO-CMOS ST-BUS™ FAMILY MT8980D

®

Digital Switch

Features

• Mitel 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

ISSUE 6

May 1995

Ordering Information

MT8980DC 40 Pin Ceramic DIP

MT8980DE 40 Pin Plastic DIP

MT8980DP 44 Pin PLCC

MT8980DL 44 Pin QFP

-40°C to +85°C

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.

STi0

STi1

STi2

STi3

STi4

STi5

STi6

STi7

Serial

to

Parallel

Converter

C4i F0i

VDD VSS

Data

Memory

Frame

Counter

Control Register

Control Interface

AAA

AAA

DS CS R/W A5/ DTA D7/

A0

D0

Output

MUX

Connection

Memory

CSTo

ODE

Parallel

to

Serial

Converter

STo0

STo1

STo2

STo3

STo4

STo5

STo6

STo7

Figure 1 - Functional Block Diagram

2-3

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