IDT72V8981

3.3 VOLT TIME SLOT INTERCHANGE DIGITAL SWITCH 128 x 128 IDT72V8981 FEATURES: 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) 3.3V Power Supply Available in 44-pin Plastic Leaded Chip Carrier (PLCC), and 44-pin Plastic Quad Flatpack (PQFP) Operating Temperature Range -40°C to +85°C 3.3V I/O with 5V Tolerant Inputs DESCRIPTION: The IDT72V8981 is a ST-BUS® compatible digital switch controlled by a microprocessor. TheIDT72V8981canhandleasmanyas128,64Kbit/sinput 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. FUNCTIONAL DESCRIPTION AfunctionalblockdiagramoftheIDT72V8981deviceisshownbelow. The serial s...