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3.3 volt supply

5V tolerant inputs and TTL compatible outputs

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

Available in PLCC-44 and SSOP-48 packages

Pin compatible with MT8985 device

Low power consumption

DS5194

ISSUE 2

September 1999

Ordering Information

MT89L85AP 44 Pin PLCC

MT89L85AN 48 Pin SSOP

-40擄C to +85擄C

Description

The MT89L85 Enhanced Digital Switch device is an

upgraded 3-volt version of the MT8985 Digital

Switch. It is pin compatible with the MT8985 and

retains all of the MT8985's functionality. The

enhanced digital swtich 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 MT89L85 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 RESET 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

** for 48-pin SSOP only

DS CS R/W A5/

A0

DTA D7/

D0

CSTo

Figure 1 - Functional Block Diagram

1

型號

版本

描述

廠商

下載
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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MT8924

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MT8926

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

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

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Advanced T1/CEPT Digital Trunk PLL

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

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MT8941
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ISO-CMOS ST-BUS⑩ FAMILY Data Codec

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MT8950
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ISO-CMOS ST-BUS⑩ FAMILY HDLC Protocol Controller

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ISO-CMOS ST-BUS⑩ FAMILY HDLC Protocol Controller

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MT8960

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Integrated PCM Filter Codec

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MT8960
MT8960

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Integrated PCM Filter Codec

MT8960

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