HD74HCT138 Datasheet, PDF (2/8 Pages) Hitachi Semiconductor – 3-to-8-line Decoder/Demultiplexer

HD74HCT138
Function Table
Inputs
Enable
Select
Outputs
G₁ G_2A
G_2B
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
Pin Arrangement
A1
Select
Inputs
B2
C3
G2A 4
Enable
Inputs
G2B 5
G1 6
Outputs Y₇ 7
GND 8
A
B
Y0
C
Y1
G2A
Y2
G2B
Y3
G1
Y4
Y7 _Y6 Y₅
(Top view)
16 VCC
15 Y0
14 Y1
13 Y2
12 Y3 Outputs
11 Y4
10 Y5
9 Y6
2