HD74HC238
3-to-8-line Decoder/Demultiplexer
Description
The HD74HC238 has 3 binary select inputs (A, B and C). If the device is enabled these inputs determine
which one of the eight normally high outputs will go low. Two active low and one active high enables (G
1
,
G
2A
and G
2B
) are provided to ease the cascading of decoders.
Features
鈥?/div>
High Speed Operation: t
pd
(Data to Y) = 15 ns typ (C
L
= 50 pF)
鈥?/div>
High Output Current: Fanout of 10 LSTTL Loads
鈥?/div>
Wide Operating Voltage: V
CC
= 2 to 6 V
鈥?/div>
Low Input Current: 1 碌A max
鈥?/div>
Low Quiescent Supply Current: I
CC
(static) = 4 碌A max (Ta = 25擄C)
Function Table
Inputs
Enable
G
1
X
X
L
H
H
H
H
H
H
H
H
G
2A
X
H
X
L
L
L
L
L
L
L
L
G
2B
H
X
X
L
L
L
L
L
L
L
L
Select
C
X
X
X
L
L
L
L
H
H
H
H
B
X
X
X
L
L
H
H
L
L
H
H
A
X
X
X
L
H
L
H
L
H
L
H
Outputs
Y
0
L
L
L
H
L
L
L
L
L
L
L
Y
1
L
L
L
L
H
L
L
L
L
L
L
Y
2
L
L
L
L
L
H
L
L
L
L
L
Y
3
L
L
L
L
L
L
H
L
L
L
L
Y
4
L
L
L
L
L
L
L
H
L
L
L
Y
5
L
L
L
L
L
L
L
H
L
L
Y
6
L
L
L
L
L
L
L
L
L
H
L
Y
7
L
L
L
L
L
L
L
L
L
L
H
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