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IDT728981

Renesas
Part Number IDT728981
Manufacturer Renesas
Description TIME SLOT INTERCHANGE DIGITAL SWITCH
Published Jan 19, 2020
Detailed Description TIME SLOT INTERCHANGE DIGITAL SWITCH 128 x 128 IDT728981 FEATURES: • 128 x 128 channel non-blocking switch • Serial Te...
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IDT728981
IDT728981

Overview
TIME SLOT INTERCHANGE DIGITAL SWITCH 128 x 128 IDT728981 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) • 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 DESCRIPTION: 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.
FUNCTIONAL DESCRIPTION A functional block diagram of the IDT728981 device is shown below.
The serial streamsoperatecontinuouslyat2.
048Mb/sandarearrangedin125μs wide frames each containing 32, 8-bit channels.
Four input (RX0-3) and four output (TX0-3) serial streams are provided in the IDT728981 device allowing a complete 128 x 128 channel non-blocking switch matrix to be constructed.
The serial interface (C4i) clock 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 128-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.
FUNCTIONAL BLOCK DIAGRAM C4i F0i VCC GND ODE RX0 Receive RX1 Serial Data RX2 Streams RX3 Timing Unit Output MUX Data Memory Control Register Microprocessor Interface Connection Memory DS CS R/W A0/ DTA D0/ A5 D7 Transmit Serial Data Streams TX0 TX1 TX2 TX3 5703 drw01 JANUARY 2001 1 DSC-5703/1 IDT728981 Time Slot Interchange Digital Switch 128...


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