HD74HC138 データシートの表示（PDF） - Hitachi -> Renesas Electronics
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HD74HC138 Datasheet PDF : 9 Pages
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HD74HC138
3-to-8-line Decoder/Demultiplexer
Description
The HD74HC138 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 (G1,
G2A and G2B) are provided to ease the cascading of decoders.
Features
• High Speed Operation: tpd (A, B, C to Y) = 16.5 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 V to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs
Enable
Select
Outputs
G1 G2A
G2B
C
B
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
XX
H
X
X
X
H
H
H
H
H
H
H
H
XH
X
X
X
X
H
H
H
H
H
H
H
H
LX
X
X
X
X
H
H
H
H
H
H
H
H
HL
L
L
L
L
L
H
H
H
H
H
H
H
HL
L
L
L
H
H
L
H
H
H
H
H
H
HL
L
L
H
L
H
H
L
H
H
H
H
H
HL
L
L
H
H
H
H
H
L
H
H
H
H
HL
L
H
L
L
H
H
H
H
L
H
H
H
HL
L
H
L
H
H
H
H
H
H
L
H
H
HL
L
H
H
L
H
H
H
H
H
H
L
H
HL
L
H
H
H
H
H
H
H
H
H
H
L
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