HD74HC540/HD74HC541
Octal Buffers/Line Drivers (with 3-state outputs)
Description
The HD74HC540 is an inverting buffer and the HD74HC541 is a non-inverting buffer. The 3-state control
gate operates as a two-input NOR such that if either G
1
or G
2
are high, all eight outputs are in the high-
impedance state.
Features
High Speed Operation: t
pd
= 11.5 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 A max
Low Quiescent Supply Current: I
CC
(static) = 4 A max (Ta = 25C)
Function Table
Inputs
Output Y
G
1
G
2
A
HD74HC540
HD74HD541
L
L
L
H
L
L
L
H
L
H
H
X
X
Z
Z
X
H
X
Z
Z
X :
irrelevant
Z
:
off (high-impedance) state of a 3-state output.
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