mm74hct138 Fairchild Semiconductor, mm74hct138 Datasheet - Page 2

• Manufacturer Part Number: mm74hct138
• Description: Mm74hct138 3-to-8 Line Decoder
• Manufacturer: Fairchild Semiconductor

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