December 1990

4

Philips Semiconductors

Product specification

8-bit parallel-in/serial-out shift register

74HC/HCT165

FUNCTION TABLE

Note

1. H = HIGH voltage level

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

L = LOW voltage level

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

q = lower case letters indicate the state of the referenced output one set-up time prior to the

LOW-to-HIGH clock transition

X = don’t care

↑ = LOW-to-HIGH clock transition

OPERATING MODES

INPUTS

OUTPUTS

PL

CE

CP

parallel load

L

L

X

X

X

X

X

X

L

H

L

H

L - L

H - H

L

H

H

L

serial shift

H

H

L

L

↑

↑

l

h

X

X

L

H

hold “do nothing”

H

H

X

X

X

Fig.4 Functional diagram.

Fig.5 Logic diagram.