Philips Semiconductors
Product specification
Octal D-type transparent latch; 3-state
74HC/HCT573
FUNCTION TABLE
INPUTS
OE LE
OUTPUTS
INTERNAL
OPERATING
MODES
LATCHES
DN
Q0 to Q7
enable and read
register
L
L
H
H
L
H
L
H
L
H
(transparent mode)
latch and read
register
L
L
L
L
l
h
L
H
L
H
latch register and
disable outputs
H
H
L
L
l
h
L
H
Z
Z
Notes
1. H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the HIGH-to-LOW
LE transition
L = LOW voltage level
l = LOW voltage level one set-up time prior to the HIGH-to-LOW
LE transition
Z = high impedance OFF-state
Fig.4 Functional diagram.
Fig.5 Logic diagram.
December 1990
4
NXP [ NXP ]
