Philips Semiconductors
Product specification
3-to-8 line decoder/demultiplexer; inverting
PIN DESCRIPTION
PIN NO.
1, 2, 3
4, 5
6
8
15, 14, 13, 12, 11, 10, 9, 7
16
SYMBOL
A
0
to A
2
E
1
, E
2
E
3
GND
Y
0
to Y
7
V
CC
NAME AND FUNCTION
address inputs
enable inputs (active LOW)
enable input (active HIGH)
ground (0 V)
outputs (active LOW)
positive supply voltage
74HC/HCT138
handbook, halfpage
1
2
3
A0
A1
A2
Y0
Y1
Y2
Y3
Y4
15
14
13
12
11
10
9
7
4
5
6
E1
E2
E3
Y5
Y6
Y7
MLB312
Fig.1 Pin configuration.
Fig.2 Logic symbol.
(a)
(b)
Fig.3 IEC logic symbol.
Fig.4 Functional diagram.
September 1993
3