128 x 128 TSI, 4 I/O at 2Mbps, Variable Delay, 5.0V

The IDT728981 is a ST-BUS compatible digital switch controlled by a microprocessor. The IDT728981 can handle as many as 128, 64 Kbit/s input and output channels. Those 128 channels are divided into 4 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.

• 128 x 128 channel non-blocking switch
• Serial Telecom Bus Compatible (ST-BUS®)
• 4 RX inputs-32 channels at 64 Kbit/s per serial line
• 4 TX output-32 channels at 64 Kbit/s per serial line
• Three-state serial outputs
• Microprocessor Interface (8-bit data bus)
• 5V Power Supply
• Available in 44-pin Plastic Leaded Chip Carrier (PLCC), 40-pin Plastic Dip (P-DIP) and 44-pin Plastic Quad Flatpack (PQFP)
• Operating Temperature Range -40°C to +85°C