M74HC138 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M74HC138 Datasheet PDF : 10 Pages
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M74HC138
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4, 5
6
9, 10, 11, 12,
13, 14, 15,
7
8
16
SYMBOL
A, B, C
G2A, G2B
G1
Y0 to Y7
NAME AND FUNCTION
Address Inputs
Enable Inputs
Enable Input
Data Outputs
GND
VCC
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
ENABLE
SELECT
G2B G2A G1
C
B
A
X
X
L
X
X
X
X
H
X
X
X
X
H
X
X
X
X
X
L
L
H
L
L
L
L
L
H
L
L
H
L
L
H
L
H
L
L
L
H
L
H
H
L
L
H
H
L
L
L
L
H
H
L
H
L
L
H
H
H
L
L
L
H
H
H
H
X : Don’t Care
LOGIC DIAGRAM
OUTPUTS
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
This logic diagram has not be used to estimate propagation delays
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