MT8980D

ISO-CMOS ST-BUS FAMILY MT8980D Digital Switch Features Zarlink ST-BUS compatible 8-line x 32-channel inputs 8-line x 32-channel outputs 256 ports non-blocking switch Single power supply (+5 V) Low power consumption: 30 mW Typ. Microprocessor-control interface Three-state serial outputs ISSUE 8 Ordering Information March 1997 MT8980DE MT8980DP 40 Pin Plastic DIP 44 Pin PLCC -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 256 64 kbit/s channels. Each of the eight serial inputs and outputs consist of 32 64 kbit/s channels multiplexed to form a 2048 kbit/s ST-BUS stream. In addition, the MT8980 provides microprocessor read and write access to individual ST-BUS channels. STi0 STi1 STi2 STi3 STi4 STi5 STi6 STi7 Serial to Parallel Converter C4i F0i VDD VSS Data Memory Frame Counter Control Register Control Interface Output MUX Connection Memory ODE Parallel to Serial Converter STo0 STo1 STo2 STo3 STo4 STo5 STo6 STo7 DS CS R/W A5/ DTA D7/ A0 D0 CSTo Figure 1 - Functional Block Diagram 2-3 MT8980D NC STi2 STi1 STi0 DTA CSTo ODE STo0 STo1 STo2 NC 6 5 4 3 2 1 44 43 42 41 40 STi3 STi4 STi5 STi6 STi7 VDD F0i C4i A0 A1 A2 7 8 9 10 11 12 13 14 15 16 17 39 STo3 38 STo4 37 STo5 36 STo6 35 STo7 34 VSS 33 D0 32 D1 31 D2 30 D3 29 D4 NC 18 A3 19 A4 20 A5 21 DS 22 R/W 2...