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.

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