ISO-CMOS

MT8981D

2-19

22-

24

25-

27

D7-D5 Data 7 to 5 (Three-state I/O Pins). These are the bidirectional data pins on the

microprocessor interface.

25-

29

29-

33

D4-D0 Data 4 to 0 (Three-state I/O Pins). These are the bidirectional data pins on the

microprocessor interface.

30

34

Power Input. Negative Supply (Ground).

31-

34

35-

38

IC

Internal Connections. Leave pins disconnected.

35

39

STo3 ST-BUS Output 3 (Three-state Outputs). These are the pins for the four 2048 kbit/s ST-

BUS output streams.

36-

38

41-

43

STo2-

STo0

ST-BUS Output 2 to 0 (Three-state Outputs). These are the pins for the four 2048

kbit/s ST-BUS output streams.

39

44

ODE Output Drive Enable (Input). If this input is held high, the STo0-STo3 output drivers function

normally. If this input is low, the STo0-STo3 output drivers go into their high impedance state.

NB: Even when ODE is high, channels on the STo0-STo3 outputs can go high impedance

under software control.

40

1

IC

Internal Connection. Leave pin disconnected.

Pin Description (continued)

Pin #

Name

Description

40

DIP

44

PLCC