74HC194 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

メーカー

74HC194

4-bit bidirectional universal shift register

Philips Electronics 

Philips Semiconductors

4-bit bidirectional universal shift register

Product specification

74HC/HCT194

Fig.4 Functional diagram.

FUNCTION TABLE

INPUTS

OUTPUTS

OPERATING MODES

CP

MR

S1

S0

DSR

DSL

Dn

Q0

Q1

Q2

Q3

reset (clear)

X

L

X

X

X

X

X

L

L

L

L

hold (“do nothing”)

shift left

shift right

parallel load

X

H

I

I

X

X

X

q0

q1

q2

q3

↑

H

h

I

X

I

X

q1

q2

q3

L

↑

H

h

I

X

h

X

q1

q2

q3

H

↑

H

I

h

I

X

X

L

q0

q1

q2

↑

H

I

h

h

X

X

H

q0

q1

q2

↑

H

h

h

X

X

dn

d0

d1

d2

d3

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

q,d = lower case letters indicate the state of the referenced input (or output) one set-up time prior to the

LOW-to-HIGH CP transition

X = don’t care

↑ = LOW-to-HIGH CP transition

December 1990

4

Share Link: