Philips Semiconductors
Product specification
8-input multiplexer; 3-state
74HC/HCT251
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
4, 3, 2, 1, 15, 14, 13, 12
I0 to I7
Y
multiplexer inputs
multiplexer output
5
6
Y
complementary multiplexer output
3-state output enable input (active LOW)
ground (0 V)
7
OE
8
GND
S0, S1, S2
VCC
11, 10, 9
16
select inputs
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
3