MT89L80 Просмотр технического описания (PDF) - Mitel Networks

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MT89L80

CMOS ST-BUS™ FAMILY Digital Switch

Mitel Networks 

CMOS ST-BUS™ FAMILY

MT89L80

Digital Switch

Advance Information

Features

• 3.3 volt supply

• 5V tolerant inputs and TTL compatible outputs.

• 256 x 256 channel non-blocking switch

• Accepts serial streams at 2.048Mb/s

• Per-channel three-state control

• Patented per channel message mode

• Non-multiplexed microprocessor interface

• Mitel ST-BUS compatible

• Low power consumption: typical 15mW

• Pin compatible with the MT8980DP

Applications

• Key telephone systems

• PBX systems

• Small and medium voice switching systems

DS5196

ISSUE 2

September 1999

Ordering Information

MT89L80AP 44 Pin PLCC

MT89L80AN 48 Pin SSOP

-40°C to +85°C

Description

This VLSI 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 MT89L80 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

**

RESET

VDD VSS

Data

Memory

Frame

Counter

Control Register

Control Interface

Output

MUX

Connection

Memory

ODE

Parallel

to

Serial

Converter

STo0

STo1

STo2

STo3

STo4

STo5

STo6

STo7

** for 48-pin SSOP only

DS CS R/W A5/ DTA D7/

A0

D0

CSTo

Figure 1 - Functional Block Diagram

2-3

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