INPUT/OUTPUT DESCRIPTION

I/O

Symbol

Pin

Description

POWER

40

Positive Power Supply

20

Negative Power Supply

ADDRESS

I

AX0-AX3

4, 5, 22, 23

X Address Lines. These 4 pins are used to select one of the 12 rows of

switches. Refer to the truth table for legal address.

I

AY0-AY2

2, 24, 25

Y Address Lines. These 3 pins are used to select one of the 8 columns of

switches. Refer to the truth table for legal address.

CONTROL

I

DATA

38

This input determines if the selected switch will be turned on (closed) or off

(opened). If the pin is held high, the selected switch will be closed.

If the pin is held low, the switch will be opened.

I

STROBE

18

This pin enables whatever action is selected by the ADDRESS and DATA pins.

When the STROBE pin is held low, no switch openings or closings take place.

When the STROBE pin is held high, the switch addressed by the select lines

will be opened or closed (depending upon the state of the DATA pin)

I

RESET

3

Master Reset. This pin turns off (opens) all 96 switches. The states of the

above control lines are irreleant. This pin is active high.

DATA

I/O

X0-X11

8-13, 28-33

Analog Input/Outputs. These pins are connected to the Y0-Y7 pins in according

to the truth table.

I/O

Y0-Y7

1,15,17,19,21

35,37,39

Analog Input/Outputs. These pins are connected to the X0-X15 pins in

according to the truth table.

PIN CONNECTION (top view)

M3493B2

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