SN54HC139, SN74HC139

DUAL 2LINE TO 4LINE DECODERS/DEMULTIPLEXERS

SCLS108D − DECEMBER 1982 − REVISED SEPTEMBER 2003

2

POST OFFICE BOX 655303

description/ordering information (continued)

The ’HC139 devices comprise two individual 2-line to 4-line decoders in a single package. The active-low enable

(G) input can be used as a data line in demultiplexing applications. These decoders/demultiplexers feature fully

buffered inputs, each of which represents only one normalized load to its driving circuit.

FUNCTION TABLE

INPUTS

OUTPUTS

G

SELECT

OUTPUTS

G

B

A

Y0

Y1

Y2

Y3

H

X

X

H

H

H

H

L

L

LL

HH

H

L

L

HH

LH

H

L

H

LH

HLH

L

H

H

H

H

H

L

logic diagram (positive logic)

1G

1Y0

1Y1

1Y2

1Y3

2Y0

2Y1

2Y2

2Y3

1A

1B

2G

2A

2B

Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages.

1

2

3

15

14

13

4

5

6

7

12

11

10

9