IDT72V8980 TIME SLOT INTERCHANGE DIGITAL SWITCH Datasheet

3.3 VOLT TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256

IDT72V8980

FEATURES
• 256 x 256 channel non-blocking switch
• Serial Telecom Bus Compatible (ST-BUS®)
• 8 RX inputs-32 channels at 64 Kbit/s per serial line
• 8 TX output-32 channels at 64 Kbit/s per serial line
• Three-state serial outputs
• Microprocessor Interface (8-bit data bus)
• 3.3V Power Supply
• Available in 44-pin Plastic Leaded Chip Carrier (PLCC), 48-pin Small Shrink Outline Package (SSOP), 48-pin Plastic Small Outline (TSSOP) and 44-pin Plastic Quad Flatpack (PQFP)
• Operating Temperature Range -40°C to +85°C

The IDT72V8980 is a ST-BUS compatible digital switch controlled by a microprocessor. The IDT72V8980 can handle as many as 256, 64 Kbit/s input and output channels. Those 256 channels are divided into 8 serial inputs and outputs, each of which consists of 32 channels (64 Kbit/s per channel) to form a multiplexed 2.048 Mb/s stream.

A functional block diagram of the IDT72V8980 device. The serial ST-BUS streams operate continuously at 2.048 Mb/s and are arranged in 125µs wide frames each containing 32, 8-bit channels. Eight input (RX0-7) and eight output (TX0-7) serial streams are provided in the IDT72V8980 device allowing a complete 256 x 256 channel non-blocking switch matrix to be constructed. The serial interface clock (C4i) for the device is 4.096 MHz. The received serial data is internally converted to a parallel format by the on chip serial-to-parallel converters and stored sequentially in a 256-position Data Memory. By using an internal counter that is reset by the input 8 KHz frame pulse, F0i, the incoming serial data streams can be framed and sequentially addressed.

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