SN74ALS156

DECODER/DEMULTIPLEXER

WITH OPENCOLLECTOR OUTPUTS

SDAS099C − JUNE 1986 − REVISED MAY 1996

3

POST OFFICE BOX 655303

POST OFFICE BOX 1443

X/Y

2-LINE TO 4-LINE DECODER

1

1C

4

1Y0

7

1Y1

6

1Y2

5

1Y3

4

0

1

2

3

2Y0

9

2Y1

10

2Y2

11

2Y3

12

0

1

2

3

α

α

α

α

β

β

β

β

2

1

13

A

2

3

B

14

15

&

&

EN

EN

1G

2G

2C

1-LINE TO 4-LINE DEMULTIPLEXER

0

13

A

1

3

B

G

0

3

DMUX

4

1

1C

G4

2

1G

14

15

2G

2C

1Y0

7

1Y1

6

1Y2

5

1Y3

4

2Y0

9

2Y1

10

2Y2

11

2Y3

12

0

1

2

3

X/Y

3-LINE TO 8-LINE DECODER

C

2Y0

9

2Y1

10

2Y2

11

2Y3

12

0

1

2

3

1Y0

7

1Y1

6

1Y2

5

1Y3

4

4

5

6

7

1

13

A

2

3

B

G

1

15

2

14

EN

2

DMUX

1-LINE TO 8-LINE DEMULTIPLEXER

C

2Y0

9

2Y1

10

2Y2

11

2Y3

12

0

1

2

3

1Y0

7

1Y1

6

1Y2

5

1Y3

4

4

5

6

7

13

A

3

B

G

1

15

2

14

G

0

7

0

† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.