®
ISO-CMOS ST-BUS™ FAMILY
MT8950
Data Codec
Features
•
•
•
•
•
•
•
Transparent coding and decoding of 0 to 8, 9.6
and 19.2 kbps data
Coding compatible to PCM voice channels at
56/64 kbps in ST-BUS format
Automatic line polarity detection and correction
Loopback facility for test purposes
Selectable data formats: RZ or NRZ
Eight user selectable modes of operation
Low power ISO-CMOS technology
ISSUE 4
November 1990
Ordering Information
MT8950AC
24 Pin Ceramic DIP
0°C to 70°C
Description
The MT8950 is a coder/decoder which uses the
Transition Encoded Modulation (TEM) technique for
encoding/decoding low speed data to and from a 56/
64 kbps channel (equivalent to PCM Voice). The
coding and decoding scheme is transparent and can
accept either synchronous or asynchronous data up
to 8 kbps (inclusive); at 9.6 kbps and 19.2 kbps.
The MT8950 is fabricated in MITEL’s ISO-CMOS
technology.
Applications
•
•
•
•
Transparent coder/decoder for synchronous
and asynchronous data
Data terminal (RS-232C, etc.) to ST-BUS
interface
Data switching on digital PBXs
Channel banks/TDM multiplexers
DP
SCLK
D
R
1
D
R
2
DF
D
X
1
D
X
2
RxE
NRZ/RZ
Input
Circuit
NRZ/RZ
Output
Circuit
Timing
& Mode
Control
Encoder
Enable
Logic
C2i
F1i
CA
Decoder
DSTi
ST-BUS
Interface
DSTo
CSTi
Control
Register
DA
Monitoring
Interface
SPo
NRZo
SPi
PRST
V
DD
V
SS
Figure 1 - Functional Block Diagram
6-3
MITEL [ MITEL NETWORKS CORPORATION ]
