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 MT8985s 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.

Features

• 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 identification 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

Applications

• Medium size digital switch matrices

• Hyperchannel switching (e.g., ISDN H0)

• ST-BUS/MVIP™ interface functions

• Serial bus control and monitoring

• Centralized voice processing systems

• Data multiplexer