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256 x 256 channel non-blocking switch

Programmable frame integrity for wideband

channels

Automatic identi鏗乧ation of ST-BUS/GCI

interface backplanes

Per channel tristate control

Patented message mode

Non-multiplexed microprocessor interface

Single +5 volt supply

Available in DIP-40, PLCC-44 and QFP-44

packages

Pin compatible with MT8980 device

ISSUE 5

March 1997

Ordering Information

MT8985AE

40 Pin Plastic DIP

MT8985AP

44 Pin PLCC

MT8985AL

44 Pin QFP

-40擄C to +85擄C

Description

The MT8985 Enhanced Digital Switch device is an

upgraded version of the popular MT8980D Digital

Switch (DX). It is pin compatible with the MT8980D

and retains all of the MT8980D's functionality. This

VLSI device is designed for switching PCM-encoded

voice or data, under microprocessor control, in digital

exchanges,

PBXs

and

any

ST-BUS/MVIP

environment. It provides simultaneous connections

for up to 256 64kb/s channels. Each of the eight

serial inputs and outputs consist of 32 64 kbit/s

channels multiplexed to form a 2048 kbit/s stream.

As the main function in switching applications, the

device provides per-channel selection between

variable or constant throughput delays. The constant

throughput delay feature allows grouped channels

such as ISDN H0 to be switched through the device

maintaining its sequence integrity. The MT8985 is

ideal for medium sized mixed voice/data switch and

voice processing applications.

Applications

鈥?/div>

Medium size digital switch matrices

Hyperchannel switching (e.g., ISDN H0)

ST-BUS/MVIP

鈩?/div>

interface functions

Serial bus control and monitoring

Centralized voice processing systems

Data multiplexer

C4i

F0i

V

DD

V

SS

ODE

STi0

STi1

STi2

STi3

STi4

STi5

STi6

STi7

Serial

to

Parallel

Converter

Data

Memory

Frame

Counter

Output

MUX

Parallel

to

Serial

Converter

STo0

STo1

STo2

STo3

STo4

STo5

STo6

STo7

Control Register

Connection

Memory

Control Interface

DS CS R/W A5/

A0

DTA D7/

D0

CSTo

Figure 1 - Functional Block Diagram

2-45

型號

版本

描述

廠商

下載
MT8920

英文版

ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit

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MT8920
MT8920

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ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit

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MT8920
MT8924

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PCM Conference Circuit (PCC) Preliminary Information

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MT8924
MT8924

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PCM Conference Circuit (PCC) Preliminary Information

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MT8924
MT8926

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MT8926
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MT8930
MT8940

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ISO-CMOS ST-BUS⑩ FAMILY T1/CEPT Digital Trunk PLL

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ISO-CMOS ST-BUS⑩ FAMILY T1/CEPT Digital Trunk PLL

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MT8940
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Advanced T1/CEPT Digital Trunk PLL

MT8941
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CMOS ST-BUS⑩ FAMILY Advanced T1/CEPT Digital Trunk PLL

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MT8941
MT8941

英文版

Advanced T1/CEPT Digital Trunk PLL

ZARLINK [Z...

MT8941
MT8941

英文版

CMOS ST-BUS⑩ FAMILY Advanced T1/CEPT Digital Trunk PLL

MITEL [Mit...

MT8941
MT8950

英文版

ISO-CMOS ST-BUS⑩ FAMILY Data Codec

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MT8950
MT8950

英文版

ISO-CMOS ST-BUS⑩ FAMILY Data Codec

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MT8950
MT8952

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ISO-CMOS ST-BUS⑩ FAMILY HDLC Protocol Controller

MITEL

MT8952
MT8952

英文版

ISO-CMOS ST-BUS⑩ FAMILY HDLC Protocol Controller

MITEL [Mit...

MT8952
MT8960

英文版

Integrated PCM Filter Codec

MITEL

MT8960
MT8960

英文版

Integrated PCM Filter Codec

MT8960

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