December 1990

4

Philips Semiconductors

Product specification

4-bit parallel access shift register

74HC/HCT195

APPLICATIONS

• Serial data transfer

• Parallel data transfer

• Serial-to-parallel data transfer

• Parallel-to-serial data transfer

FUNCTION TABLE

Notes

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, d = lower case letters indicate the state of the referenced input (or 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

MR

CP

PE

J

asynchronous reset

L

X

X

X

X

X

L

L

L

L

H

shift, set first stage

shift, reset first stage

shift, toggle first stage

shift, retain first stage

H

H

H

H

↑

↑

↑

↑

h

h

h

h

h

l

h

l

h

l

l

h

X

X

X

X

H

L

q0

q0

q0

q0

q0

q0

q1

q1

q1

q1

q2

q2

q2

q2

q2

q2

q2

q2

parallel load

H

↑

lX

X

Fig.4 Functional diagram.