3.3 VOLT TIME SLOT INTERCHANGE IDT72V8981 DIGITAL SWITCH 128 x 128 outputs, each of which consists of 32 channels (64 Kbit/s per channel) to form FEATURES: a multiplexed 2.048 Mb/s stream. 128 x 128 channel non-blocking switch Serial Telecom Bus Compatible (ST-BUS ) FUNCTIONAL DESCRIPTION 4 RX inputs32 channels at 64 Kbit/s per serial line 4 TX output32 channels at 64 Kbit/s per serial line A functional block diagram of the IDT72V8981 device is shown below. The Three-state serial outputs serial streams operate continuously at 2.048 Mb/s and are arranged in 125 s Microprocessor Interface (8-bit data bus) wide frames each containing 32, 8-bit channels. Four input (RX0-3) and four 3.3V Power Supply output (TX0-3) serial streams are provided in the IDT72V8981 device allowing Available in 44-pin Plastic Leaded Chip Carrier (PLCC), and a complete 128 x 128 channel non-blocking switch matrix to be constructed. 44-pin Plastic Quad Flatpack (PQFP) The serial interface clock ( C4i) for the device is 4.096 MHz. Operating Temperature Range -40C to +85C The received serial data is internally converted to a parallel format by the 3.3V I/O with 5V Tolerant Inputs 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 DESCRIPTION: addressed. The IDT72V8981 is a ST-BUS compatible digital switch controlled by a Data to be output on the serial streams may come from two sources: Data microprocessor. The IDT72V8981 can handle as many as 128, 64 Kbit/s input Memory or Connection Memory. The Connection Memory is 16 bits wide and and output channels. Those 128 channels are divided into 4 serial inputs and FUNCTIONAL BLOCK DIAGRAM C4i F0i VCC GND ODE Timing Unit Output MUX RX0 TX0 Transmit Receive RX1 TX1 Data Serial Data Serial Data Memory Streams Streams TX2 RX2 RX3 Connection TX3 Control Register Memory Microprocessor Interface 5702 drw01 DS A0/ CS R/W D0/ DTA A5 D7 AUGUST 2003 IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The ST-BUS is a trademark of Mitel Corp. 1 2003 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. DSC-5702/4IDT72V8981 3.3V Time Slot Interchange Commercial Temperature Range Digital Switch 128 x 128 PIN CONFIGURATION INDEX RX3 7 TX3 39 (1) VCC 8 38 DNC (1) VCC 9 37 DNC (1) VCC 10 36 DNC (1) VCC 35 11 DNC VCC 12 34 GND 13 33 F0i D0 C4i 14 32 D1 A0 15 31 D2 A1 16 30 D3 A2 17 29 D4 5702 drw02 PLCC: 0.05in. pitch, 0.65in. x 0.65in. (J44-1, order code: J) TOP VIEW INDEX RX3 1 33 TX3 (1) VCC DNC 2 32 (1) VCC DNC 3 31 (1) VCC 4 DNC 30 (1) VCC 5 29 DNC VCC 6 28 GND F0i 7 27 D0 26 D1 C4i 8 A0 25 9 D2 A1 10 24 D3 A2 23 D4 11 5702 drw03 PQFP: 0.80mm pitch, 10mm x 10mm (DB44-1, order code: DB) TOP VIEW NOTE: 1. DNC - Do Not Connect 2 (1) (1) DNC 12 44 DNC(1) 6 DNC (1) DNC 18 13 43 RX2 5 A3 RX2 A3 19 14 42 RX1 A4 4 RX1 A4 20 A5 15 41 RX0 3 RX0 A5 21 16 40 DS DTA 2 DTA 22 DS 17 39 R/W DNC(1) (1) 1 DNC R/W 23 18 38 CS ODE 44 ODE CS 24 D7 19 37 TX0 43 TX0 25 D7 D6 20 36 TX1 42 TX1 26 D6 21 35 TX2 D5 41 TX2 (1) D5 27 DNC 22 34 DNC(1) (1) 40 DNC (1) DNC 28