Datasheet

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