Turning Ideas Into Reality

ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104

Part Number 74C922-SO

Example Circuit

DATA OUT C

74C922-SO

11

5

12

13

14

15

1

2

3

4

6

7

9

10

18

8

16

19

20

17

COLX2

NC

COLX1

DATAAVAIL

NC

NC

ROWY1

ROWY2

ROWY3

ROWY4

NC

NC

COLX3

VSS

DATAOUTB

COLX4

DATAOUTD

DATAOUTA

VDD

DATAOUTC

2.4 - 5 V

DATA AVAILABLE

DATA OUT D

DATA OUT A

KEYBOARD

DATA OUT B

Connection Diagram

74C922-SO

11

5

12

13

14

15

1

2

3

4

6

7

9

10

18

8

16

19

20

17

COLX2

NC

COLX1

DATAAVAIL

NC

NC

ROWY1

ROWY2

ROWY3

ROWY4

NC

NC

COLX3

VSS

DATAOUTB

COLX4

DATAOUTD

DATAOUTA

VDD

DATAOUTC

Pin Description

Pin #

Description

Pin #

Description

1

Row Y1

20

VDD

2

Row Y2

19

Data Out A

3

Row Y3

18

Data Out B

4

Row Y4

17

Data Out C

5

NC

16

Data Out D

6

NC

15

NC

7

NC

14

NC

8

Col X4

13

Data Avail

9

Col X3

12

Col X1

10

VSS

21

Col X2

Col X1 – Col X4

These pins are open drain column driver outputs to the key matrix.

Row Y1 – Row Y4

These pins are the row inputs from the key matrix. These inputs have 5.6K (nominal) pull up

resistors on chip.