2-18

Figure 2 - Pin Connections

Pin Description

Pin #

Name

Description

40

DIP

44

PLCC

12

DTA

Data Acknowledgement (Open Drain Output). This is the data acknowledgement on the

microprocessor interface. This pin is pulled low to signal that the chip has processed the

data. A 909

Ω, 1/4W, resistor is recommended to be used as a pullup.

2-4

3-5

STi0-

STi2

ST-BUS Input 0 to 2 (Inputs). These are the inputs for the 2048 kbit/s ST-BUS input

streams.

5

7

STi3

ST-BUS Input 3 (Input). These are the inputs for the 2048 kbit/s ST-BUS input streams.

6-9

8-11

IC

10

12

Power Input. Positive Supply.

11

13

F0i

Framing 0-Type (Input). This is the input for the frame synchronization pulse for the

2048 kbit/s ST-BUS streams. A low on this input causes the internal counter to reset on

the next negative transition of C4i.

12

14

C4i

4.096 MHz Clock (Input). ST-BUS bit cell boundaries lie on the alternate falling edges of this

clock.

13-

15

15-

17

A0-A2 Address 0 to 2 (Inputs). These are the inputs for the address lines on the microprocessor

interface.

16-

18

19-

21

A3-A5 Address 3 to 5 (Inputs). These are the inputs for the address lines on the microprocessor

interface

19

22

DS

Data Strobe (Input). This is the input for the active high data strobe on the microprocessor

interface.

20

23

R/W

Read or Write (Input). This is the input for the read/write signal on the microprocessor

interface - high for read, low for write.

21

24

CS

Chip Select (Input). This is the input for the active low chip select on the microprocessor

interface.

7

8

9

10

11

12

13

14

15

16

39

38

37

36

35

34

33

32

31

30

17

29

STi3

IC

IC

IC

IC

VDD

F0i

C4i

A0

A1

A2

STo3

IC

IC

IC

IC

VSS

D0

D1

D2

D3

D4

44 PIN PLCC

DTA

STi0

STi1

STi2

STi3

IC

IC

IC

IC

VDD

F0i

C4i

A0

A1

A2

A3

A4

A5

DS

IC

ODE

STo0

STo1

STo2

STo3

IC

IC

IC

IC

VSS

D0

D1

D2

D3

D4

D5

D6

D7

CS

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

1

R/W

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

40 PIN PLASTIC DIP