Philips Semiconductors
Product specification
Quad buffer/line driver; 3-state
PIN DESCRIPTION
PIN NO.
1, 4, 10, 13
2, 5, 9, 12
3, 6, 8, 11
7
14
SYMBOL
1OE to 4OE
1A to 4A
1Y to 4Y
GND
V
CC
NAME AND FUNCTION
outputs enable inputs (active LOW)
data inputs
data outputs
ground (0 V)
positive supply voltage
74HC/HCT125
(a)
(b)
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
FUNCTION TABLE
INPUTS
nOE
L
L
H
Note
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
nA
L
H
X
OUTPUT
nY
L
H
Z
Fig.4 Functional diagram.
Fig.5 Logic diagram (one buffer).
December 1990
3