December 1990

4

Philips Semiconductors

Product specification

Octal D-type flip-flop; positive-edge trigger;

3-state; inverting

74HC/HCT564

Fig.4 Functional diagram.

FUNCTION TABLE

Notes

1. H = HIGH voltage level

h = HIGH voltage level one set-up time prior to the LOW-to-HIGH

CP transition

L = LOW voltage level

l = LOW voltage level one set-up time prior to the LOW-to-HIGH

CP transition

Z = high impedance OFF-state

↑ = LOW-to-HIGH clock transition

OPERATING

MODES

INPUTS

INTERNAL

FLIP-FLOPS

OUTPUTS

OE

CP

load and read

register

L

L

↑

↑

l

h

L

H

H

L

load register and

disable outputs

H

H

↑

↑

l

h

L

H

Z

Z

Fig.5 Logic diagram.