4-162

Figure 2 - Pin Connections

Pin Description

Pin #

Name

Description

DIP

PLCC

1

2

TxA

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.

2

3

TxB

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.

3

5

DSTo

Data ST-BUS (Output): A 2048 kbit/s serial output stream which contains the 30 PCM or

data channels received from the CEPT line.

4

4

NC

No Connection.

59

RxA

Receive A (Input): Received split phase unipolar signal decoded from a bipolar line

receiver.

610

RxB

Receive B (Input): Received split phase unipolar signal decoded from a bipolar line

receiver.

7

11

RxD

Received Data (Input): Input of the unipolar data generated from the line receiver. This

data may be NRZ or RZ.

8

13

CSTi1

Control ST-BUS Input #1: A 2048 kbit/s stream that contains channel associated

signalling, frame alignment and diagnostic functions.

9

NC

No Connection.

10

NC

No Connection.

11

17

ADI

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.

12

19

CSTi0

Control ST-BUS Input #0: A 2048 kbit/s stream that contains 30 per channel control

words and two Master Control Words.

44 PIN PLCC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

28

27

26

25

24

23

22

21

28 PIN CERDIP/PDIP

TxA

TxB

NC

RxA

RxB

RxD

CSTi1

NC

NC

ADI

CSTi0

E8Ko

VSS

VDD

IC

F0i

E2i

NC

RxMF

TxMF

C2i

NC

DSTi

NC

CSTo

XSt

XCtl

DSTo

NC

RxMF

TxMF

NC

NC

C2i

NC

NC

NC

NC

NC

NC

NC

RxA

RxB

RxD

NC

CSTi1

NC

NC

NC

ADI

1

6543 2

44 43 42 41 40

7

8

9

10

11

12

13

14

15

16

39

38

37

36

35

34

33

32

31

30

23

18 19 20 21 22

24 25 26 27 28

17

29