SN54HC139_15 Datasheet, PDF (2/22 Pages) Texas Instruments – DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS

SN54HC139, SN74HC139
DUAL 2ĆLINE TO 4ĆLINE DECODERS/DEMULTIPLEXERS
SCLS108D − DECEMBER 1982 − REVISED SEPTEMBER 2003
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
SELECT
G
B
A
H
X
X
OUTPUTS
Y0 Y1 Y2 Y3
H
H
H
H
L
L
L
L
H
H
H
L
L
H
H
L
H
H
L
H
L
H
H
L
H
L
H
H
H
H
H
L
logic diagram (positive logic)
1
1G
4
1Y0
5
1Y1
2
1A
3
1B
15
2G
6
1Y2
7
1Y3
12
2Y0
11
2Y1
14
2A
13
2B
Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages.
10
2Y2
9
2Y3
2
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