MT8979
ISO-CMOS
28 PIN CERDIP/PDIP
Figure 2 - Pin Connections
Pin Description
Pin #
Name
DIP
PLCC
Description
Transmit A (Output):
A split phase unipolar signal suitable for use with TxB and an
external line driver and transformer to construct the bipolar line signal.
Transmit B (Output:)
A split phase unipolar signal suitable for use with TxA and an
external line driver and transformer to construct the bipolar line signal.
Data ST-BUS (Output):
A 2048 kbit/s serial output stream which contains the 30 PCM or
data channels received from the CEPT line.
No Connection.
Receive A (Input):
Received split phase unipolar signal decoded from a bipolar line
receiver.
Receive B (Input):
Received split phase unipolar signal decoded from a bipolar line
receiver.
Received Data (Input):
Input of the unipolar data generated from the line receiver. This
data may be NRZ or RZ.
Control ST-BUS Input #1:
A 2048 kbit/s stream that contains channel associated
signalling, frame alignment and diagnostic functions.
No Connection.
No Connection.
Alternate Digit Inversion (Input):
If this input is high, the CEPT timeslots which are
specified on CSTi0 as voice channels are ADI coded and decoded. When this bit is low it
disables ADI coding for all channels. This feature allows either ADI or non-ADI codecs to
be used on DSTi and DSTo.
Control ST-BUS Input #0:
A 2048 kbit/s stream that contains 30 per channel control
words and two Master Control Words.
1
2
3
4
5
6
7
8
9
10
11
2
3
5
4
9
10
11
13
TxA
TxB
DSTo
NC
RxA
RxB
RxD
CSTi1
NC
NC
17
ADI
12
19
CSTi0
4-162
VSS
CSTi0
E8Ko
NC
VSS
XCtl
XSt
NC
CSTo
NC
DSTi
44 PIN PLCC
TxA
TxB
DSTo
NC
RxA
RxB
RxD
CSTi1
NC
NC
ADI
CSTi0
E8Ko
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VDD
IC
F0i
E2i
NC
RxMF
TxMF
C2i
NC
DSTi
NC
CSTo
XSt
XCtl
NC
NC
RxA
RxB
RxD
NC
CSTi1
NC
NC
NC
ADI
6 5 4 3 2 1 44 43 42 41 40
7
39
8
38
9
37
10
36
11
35
12
34
13
33
14
32
15
31
16
30
29
17
18 19 20 21 22 23 24 25 26 27 28
VSS
DSTo
NC
TxB
TxA
VDD
IC
NC
F0i
NC
E2i
NC
RxMF
TxMF
NC
NC
C2i
NC
NC
NC
NC
NC
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