December 1990

4

Philips Semiconductors

Product specification

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

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.