3-4

Figure 2 - Pin Connections

* Plastic DIP and CERDIP only

Pin Description

Pin #*

Name

Description

1-3

L2-L0

L2-L0 Analog Lines (Inputs/Outputs): these are connected to the L2-L0 columns of the

switch array.

4D0

D0 Data (Input): Active High.

5J0

J0 Analog Junctor (Input/Output): this is connected to the J0 row of the switch array.

6DI

DI Data (Input). Active High.

7J1

J1 Analog Junctor (Input/Output): this is connected to the J1 row of the switch array.

8D2

D2 Data (Input): Active High.

9J2

J2 Analog Junctor (Input/Output): this is connected to the J2 row of the switch array.

10

D3

D3 Data (Input): Active High.

11

J3

J3 Analog Junctor (Input/Output): this is connected to the J3 row of the switch array.

12

Digital Ground Reference.

13

Negative Power Supply.

14-16

A0-A2

A0-A2 Address Lines (Inputs).

17

AE

Address Enable/Strobe (Input): enables function selected by address and data. Address

must be stable before AE goes high and D0-D3 must be stable on the falling edge of the

AE. Active High.

18

MR

Master RESET (Input): this is used to turn off all switches. Active High.

19-23

L7-L3

L7-L3 Analog Lines (Inputs/Outputs): these are connected to the L7-L3 columns of the

switch array.

24

Positive Power Supply.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

24

23

22

21

20

19

18

17

L2

L1

L0

D0

J0

D1

J1

D2

J2

D3

J3

VSS

VDD

L3

L4

L5

L6

L7

MR

AE

A2

A1

A0

VEE

28 PIN PLCC

24 PIN CERDIP/PLASTIC DIP

5

6

7

8

9

10

11

25

24

23

22

21

20

19

•

L5

L6

L7

MR

AE

A2

NC

NC

D0

J0

D1

J1

D2

J2