Description
The 3.3V Multiple Rate Digital Switch (MT89L86) is pin compatible with MITEL’s 5V MT8986 and retains all of its functionality. This 3.3v device is designed to provide simultaneous non-blocking connections for up to 256 64kb/s channels or blocking connections for up to 512 64kb/s channels. The serial inputs and outputs may have 32 to 128 64kb/s channels per frame with data rates ranging from 2048 up to 8192 kb/s. It also provides per-channel selection between variable and constant throughput delays allowing voice and grouped data channels to be switched without corrupting the data sequence integrity.

Features
• 3.3 volt supply
• 5V tolerant inputs and TTL compatible outputs.
• 256 x 256 or 512 x 256 switching configurations
• 8-bit or 4-bit channel switching capability
• Guarantees frame integrity for wideband channels
• Automatic identification of ST-BUS/GCI interfaces
• Accepts serial streams with data rates of 2.048, 4.096 or 8.192 Mb/s
• Rate conversion from 2.048 Mb/s to 4.096 or 8.192 Mb/s and vice-versa
• Programmable frame offset on inputs
• Per-channel three-state control
• Per-channel message mode
• Control interface compatible to Intel/Motorola CPUs
• Low power consumption

Applications
• Medium size mixed voice and data switching/processing matrices
• Hyperchannel switching (e.g., ISDN H0)
• MVIP™ interface functions
• Serial bus control and monitoring
• Centralized voice processing systems
• Voice/Data multiplexer
• ADPCM 32 kbit/s channel switching