December 1990

4

Philips Semiconductors

Product specification

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

3-state

74HC/HCT374

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

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

transition

Z = high impedance OFF-state

↑ = LOW-to-HIGH CP transition

OPERATING

MODES

INPUTS

INTERNAL

FLIP-FLOPS

OUTPUTS

OE

CP

load and read

register

L

L

↑

↑

l

h

L

H

L

H

load register and

disable outputs

H

H

↑

↑

l

h

L

H

Z

Z

Fig.5 Logic diagram.