m74hc138 STMicroelectronics, m74hc138 Datasheet - Page 2

• Manufacturer Part Number: m74hc138
• Description: 3 To 8 Line Decoder Inverting
• Manufacturer: STMicroelectronics

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