®
ISO-CMOS ST-BUS™ FAMILY
MT8982
Small Digital Switch (MiniDX)
Features
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ST-BUS/GCI compatible switch matrix
64 channel non-blocking time switch
2 x 32 channel serial inputs and outputs
Per-channel tristate control
4-pin serial microprocessor interface
Patented message mode
Low power consumption (10 mW)
Single 5 volt supply
ISSUE 6
May 1995
Ordering Information
MT8982AC
16 Pin Ceramic DIP
MT8982AE
16 Pin Plastic DIP
MT8982AS
16 Pin SOIC
MT8982AN
20 Pin SSOP
-40 to +85°C
Description
The MT8982 Small Digital Switch (MiniDX) is a non-
blocking CMOS time switch with a capacity of up to
64 - 8 bit Time Division Multiplexed (TDM) encoded
voice or data channels. It is a size-optimized version
of MITEL's successful MT8980D Digital Switches,
providing switching capability in cost sensitive
applications such as telephone sets and digital key
systems. The TDM interface to the device is via two
pairs of 2048 kbit/s serial streams with 32 64 kbit/s
channels per stream (ST-BUS). A serial microport
provides access to the device for programming the
required connections.
The serial microport is
compatible with most common microcontrollers. The
unique message mode capability allows the MT8982
to act as a controller for other members of MITEL's
ST-BUS family of components.
Applications
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Cost sensitive digital switching applications
Digital key telephone systems
GCI/ST-BUS conversion
ST-BUS device control interface
ISDN telephone set support circuit
Interprocessor communication
STi0
STi1
Serial
to
Parallel
Converter
64 x 8
Data Memory
Output
Mux
Parallel
to
Serial
Converter
STo0
STo1
F0i
C4i
F0o
Address
Counters
Address
Mux
Data
Mux
RxD/CSTi0
TxD/NC
SCLK/CSTi1
CS/CMS
MPS
Address
Mux
ODE
Serial
Microport
64 x 9
Connect Memory
3-State
Control
Figure 1 - Functional Block Diagram
2-31
MITEL [ MITEL NETWORKS CORPORATION ]
