2-18

Figure 2 - Pin Connections

Pin Description

Pin #

Name

Description

40

DIP

44

PLCC

44

QFP

12

40

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

41-

43

STi0-

STi2

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

streams.

571

STi3

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

streams.

6-9

8-11

2-5

IC

10

12

6

Power Input. Positive Supply.

11

13

7

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.

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 CERDIP/PLASTIC DIP

1

2

3

4

5

6

7

8

9

10

33

32

31

30

29

28

27

26

25

24

11

23

44 PIN QFP

STi3

IC

IC

IC

IC

VDD

F0i

C4i

A0

A1

A2

STo3

IC

IC

IC

IC

VSS

D0

D1

D2

D3

D4