74HCT138 Datasheet, PDF (2/10 Pages) Diodes Incorporated – 3 TO 8 LINE DECODER DEMULTIPLEXER

Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
A0
A1
A2
E1
E2
E3
Y7
GND
Y6
Y5
Y4
Y3
Y2
Y1
Y0
V_cc
Description
Address Input 0
Address Input 1
Address Input 2
Enable Input 1 (active LOW)
Enable Input 2 (active LOW)
Enable Input 3 (active HIGH)
Output 7 (active LOW)
Ground
Output 6 (active LOW)
Output 5 (active LOW)
Output 4 (active LOW)
Output 3 (active LOW)
Output 2 (active LOW)
Output 1 (active LOW)
Output o (active LOW)
Supply Voltage
74HCT138
Function Table Diagram
Control
Input
Output
E1
E2
E3
A2
A1
A0
Y7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
H
X
X
X
X
X
H
H
H
H
H
H
H
H
X
H
X











X
X
L











L
L
H














L
L
L
H
H
H
H
H
H
H
L



L
L
H
H
H
H
H
H
H
L
H



L
H
L
H
H
H
H
H
L
H
H



L
H
H
H
H
H
H
L
H
H
H



H
L
L
H
H
H
L
H
H
H
H



H
L
H
H
H
L
H
H
H
H
H



H
H
L
H
L
H
H
H
H
H
H



H
H
H
L
H
H
H
H
H
H
H
74HCT138
Document number: DS35489 Rev. 3 - 2
2 of 10
www.diodes.com
June 2013
© Diodes Incorporated