MT8981D Datasheet | Mitel Networks Corporation

Features - - - - - - - - Mitel ST-BUS patible 4-line x 32-channel inputs 4-line x 32-channel outputs 128 ports non-blocking switch Single power supply (+5 V) Low power consumption: 30 m W Typ. Microprocessor-control interface Three-state serial outputs ISSUE 6 May 1995 Ordering Information MT8981DC 40 Pin Ceramic DIP MT8981DE 40 Pin Plastic DIP MT8981DP 44 PLCC MT8981DL 44 Pin QFP -40°C to +85°C .. Description This VLSI ISO-CMOS device is designed for switching PCM-encoded voice or data, under microprocessor control, in a modern digital exchange, PBX or Central Office. It provides simultaneous connections for up to 128 64 kbit/s channels. Each of the four serial inputs and outputs consist of 32 64 kbit/s channels multiplexed to form a 2048 kbit/s ST-BUS stream. In addition, the MT8981 provides microprocessor read and write access to individual ST-BUS channels. C4i F0i STi0 STi1 STi2 STi3 Serial to Parallel Converter Data Memory Frame Counter Output MUX Parallel to Serial STo0 STo1 STo2 STo3 Control Register Connection Memory Control Interface Converter A A AAA A A AAA DS CS R/W A5/ A0 DTA D7/ D0 Figure 1 - Functional Block Diagram 2-17 ISO-CMOS NC STi2 STi1 STi0 DTA IC ODE STo0 STo1 STo2 NC 6 5 4 3 2 1 44 43 42 41 40 .. NC A3 A4 A5 DS R/W CS D7 D6 D5 NC NC A3 A4 A5 DS R/W CS D7 D6 D5 NC DTA STi0 STi1 STi2 STi3 IC IC IC IC VDD F0i C4i A0 A1 A2 A3 A4 A5 DS R/W 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 IC ODE STo0 STo1 STo2 STo3 IC IC IC IC VSS D0 D1 D2 D3 D4 D5 D6 D7 CS 44 PIN QFP 40 PIN CERDIP/PLASTIC DIP 18 19 20 21 22 23 24 25 26 27 28 44 PIN PLCC Figure 2 - Pin Connections Pin Description Pin...