MT8981D Datasheet, PDF (1/14 Pages) Mitel Networks Corporation – ISO-CMOS ST-BUS™ FAMILY Digital Switch

ISO-CMOS ST-BUS™ FAMILY MT8981D
®
Digital Switch
Features
• Mitel ST-BUS compatible
• 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 mW 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.
STi0
STi1
STi2
STi3
Serial
to
Parallel
Converter
C4i F0i
V_DD V_SS
Data
Memory
Frame
Counter
Control Register
Control Interface
AAA
AAA
DS CS R/W A5/ DTA D7/
A0
D0
Output
MUX
Connection
Memory
ODE
Parallel
to
Serial
Converter
STo0
STo1
STo2
STo3
Figure 1 - Functional Block Diagram
2-17