mm74hc138 Fairchild Semiconductor, mm74hc138 Datasheet - Page 2

• Manufacturer Part Number: mm74hc138
• Description: Mm74hc138 3-to-8 Line Decoder
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Truth Table
H
Note 1: G2
Logic Diagram
HIGH Level, L
G2A G2B
LOW Level, X
G1
H
H
H
H
H
H
H
H
X
L
Enable
G2 (Note 1)
don’t care
H
X
L
L
L
L
L
L
L
L
Inputs
C
H
H
H
H
X
X
L
L
L
L
Select
B
H
H
H
H
X
X
L
L
L
L
A
H
H
H
H
X
X
L
L
L
L
Y0
H
H
H
H
H
H
H
H
H
L
2
Y1
H
H
H
H
H
H
H
H
H
L
Y2
H
H
H
H
H
H
H
H
H
L
Y3
Outputs
H
H
H
H
H
H
H
H
H
L
Y4
H
H
H
H
H
H
H
H
H
L
Y5
H
H
H
H
H
H
H
H
H
L
Y6
H
H
H
H
H
H
H
H
H
L
Y7
H
H
H
H
H
H
H
H
H
L