3.3 VOLT TIME SLOT INTERCHANGE IDT72V8985 DIGITAL SWITCH 256 x 256 and write access to individual channels. As an important function of a digital switch is to maintain sequence integrity and minimize throughput delay, the IDT72V8985 is an ideal solution for most switching needs. FEATURES: 256 x 256 channel non-blocking switch FUNCTIONAL DESCRIPTION Automatic signal identification (ST-BUS, GCI) 8 RX inputs32 channels at 64 Kbit/s per serial line Frame sequence, constant throughput delay, and guaranteed minimum 8 TX outputs32 channels at 64 Kbit/s per serial line delay are high priority requirements in todays integrated data and multimedia Three-state serial outputs networks. The IDT72V8985 provides these functions on a per-channel basis Microprocessor Interface (8-bit data bus) using a standard microprocessor control interface. Each of the eight serial lines Frame Integrity for data applications is designed to switch 64 Kbit/s PCM or N x 64 Kbit/s data. 3.3V Power Supply In Processor Mode, the microprocessor can access the input and output time Available in 44-pin Plastic Leaded Chip Carrier (PLCC) slots to control other devices such as ISDN transceivers and trunk interfaces. Operating Temperature Range -40C to +85C Supporting both GCI and ST-BUS formats, IDT72V8985 has incorporated an 3.3V I/O with 5V Tolerant Inputs internal circuit to automatically identify the polarity and format of the frame synchronization. A functional block diagram of the IDT72V8985 device is shown on page 1. DESCRIPTION: The serial streams operate continuously at 2.048 Mb/s and are arranged in The IDT72V8985 is a ST-BUS /GCI compatible digital switch controlled by 125s wide frames each containing 32, 8-bit channels. Eight input (RX0-7) and a microprocessor. The IDT72V8985 can handle as many as 256, 64 Kbit/s input eight output (TX0-7) serial streams are provided in the IDT72V8985 device and output channels. Those 256 channels are divided into 8 serial inputs and allowing a complete 256 x 256 channel non-blocking switch matrix to be outputs, each of which consists of 32 channels. The IDT72V8985 provides per- constructed. The serial interface clock for the device is 4.096 MHz. channel variable or constant throughput delay modes and microprocessor read FUNCTIONAL BLOCK DIAGRAM (1) C4i F0i VCC GND ODE RESET TX0 Timing RX0 Unit Output MUX TX1 RX1 TX2 RX2 Receive Transmit RX3 TX3 Data Serial Data Serial Data Memory Streams Streams RX4 TX4 RX5 Connection TX5 Control Register Memory RX6 TX6 RX7 Microprocessor Interface TX7 5707 drw01 CCO DS CS A0/ R/W DTA D0/ A5 D7 NOTE: 1. The RESET Input is only provided on the SSOP package. IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The ST-BUS is a trademark of Mitel Corp. AUGUST 2003 1 2003 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. DSC-5707/5IDT72V8985 3.3V Time Slot Interchange Commercial Temperature Range Digital Switch 256 x 256 PIN CONFIGURATION INDEX INDEX RX3 7 TX3 39 RX3 1 33 TX3 RX4 8 38 TX4 RX4 2 32 TX4 RX5 9 37 TX5 RX5 3 31 TX5 RX6 10 36 TX6 RX6 4 30 TX6 RX7 11 35 TX7 RX7 5 29 TX7 VCC 34 12 GND VCC 28 6 GND 13 33 D0 F0i F0i 7 27 D0 26 D1 C4i 14 32 D1 C4i 8 D2 A0 9 25 A0 15 31 D2 A1 D3 10 24 A1 16 30 D3 A2 23 D4 11 A2 17 29 D4 5707 drw03 5707 drw02 PLCC: 0.05in. pitch, 0.65in. x 0.65in PQFP: 0.80mm pitch, 10mm x 10mm (J44-1, order code: J) (DB44-1, order code: DB) TOP VIEW TOP VIEW GND 1 48 CCO DTA 2 47 ODE RX0 46 TX0 3 RX1 TX1 4 45 TX2 RX2 5 44 (1) (1) DNC 6 43 DNC RX3 42 TX3 7 RX4 TX4 8 41 RX5 TX5 9 40 RX6 10 39 TX6 RX7 38 TX7 11 VCC 12 GND 37 (2) RESET VCC 13 36 F0i 14 D0 35 D1 C4i 15 34 A0 16 33 D2 A1 17 32 D3 A2 31 D4 18 (1) (1) 30 DNC DNC 19 D5 A3 20 29 D6 A4 21 28 D7 A5 22 27 DS 23 26 CS 25 GND R/W 2 4 5707 drw04 TOP VIEW Package Type Reference Identifier Order Code SSOP: 0.025in. pitch, 0.625in. x 0.295in. SO48-1 PV NOTES: 1. DNC - Do Not Connect 2. The RESET Input is only provided on the SSOP package. 2 (1) 6 DNC (1) DNC 18 5 RX2 A3 19 4 RX1 A4 20 3 RX0 A5 21 2 DTA 22 DS 1 CCO 23 R/W 44 ODE CS 24 43 TX0 D7 25 42 TX1 26 D6 41 TX2 D5 27 (1) 40 DNC (1) DNC 28 (1) DNC 12 44 DNC(1) 13 43 RX2 A3 14 42 A4 RX1 A5 15 41 RX0 16 40 DTA DS 17 39 CCO R/W 18 38 CS ODE 19 37 D7 TX0 D6 20 36 TX1 D5 21 35 TX2 (1) DNC(1) DNC 22 34