Datasheet
December 1990 4
Philips Semiconductors Product speciļ¬cation
Octal D-type transparent latch; 3-state 74HC/HCT573
Fig.4 Functional diagram.
FUNCTION TABLE
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
OPERATING
MODES
INPUTS
INTERNAL
LATCHES
OUTPUTS
OE LE D
N
Q
0
to Q
7
enable and read
register
(transparent mode)
L
L
H
H
L
H
L
H
L
H
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
Fig.5 Logic diagram.