4-30

Figure 2 - Pin Connections

.

Pin Description

Pin #

Name

Description

DIP

PLCC

12

TxA

Transmit A Output. Unipolar output that can be used in conjunction with TxB and

external line driver circuitry to generate the bipolar DS1 signal.

23

TxB

Transmit B Output. Unipolar output that can be used in conjunction with TxA and

external line driver circuitry to generate the bipolar DS1 signal.

35

DSTo

Data ST-BUS Output. A 2048 kbit/s serial output stream which contains the 24

PCM or data channels received from the DS1 line.

44

NC

No Connection.

59

RxA

Receive A Complementary Input. Accepts a unipolar split phase signal decoded

externally from the received DS1 bipolar signal. This input, in conjunction with RxB,

detects bipolar violations in the received signal.

610

RxB

Receive B Complementary Input. Accepts a unipolar split phase signal decoded

externally from the received DS1 bipolar signal. This input, in conjunction with RxA,

detects bipolar violations in the received signal.

711

RxD

Receive Data Input. Unipolar RZ data signal decoded from the received DS1

signal. Generally the signals input at RxA and RxB are combined externally with a

NAND gate and the resulting composite signal is input at this pin.

8

13

CSTi1

Control ST-BUS Input #1. A 2048 kbit/s serial control stream which carries 24 per-

channel control words.

914

TxFDL

Transmit Facility Data Link (Input). A 4 kHz serial input stream that is multiplexed

clocked in on the rising edge of TxFDLClk.

10

16

TxFDLClk

Transmit Facility Data Link Clock (Output). A 4 kHz clock used to clock in the FDL

data.

11

NC

No connection.

C1.5i

RxSF

TxSF

NC

NC

C2i

NC

NC

NC

NC

RxFDL

NC

NC

RxA

RxB

RxD

NC

CSTi1

TxFDL

NC

TxFDLClk

NC

28 PIN CERDIP/PDIP

TxA

TxB

DSTo

NC

RxA

RxB

RxD

CSTi1

TxFDL

TxFDLClk

NC

CSTi0

E8Ko

VSS

VDD

IC

F0i

E1.5i

C1.5i

RxSF

TxSF

C2i

RxFDL

DSTi

RxFDLClk

CSTo

XSt

XCtl

1

65432

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

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