HD74HC194 Ver la hoja de datos (PDF) - Hitachi -> Renesas Electronics

Número de pieza

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HD74HC194

4-bit Bidirectional Universal Shift Register

Hitachi -> Renesas Electronics 

HD74HC194

Function Table

Inputs

Operating

Mode

Serial

Parallel

Outputs

Mode

Clear

Clear S1 S0 Clock Shift Left Shift Right A B C D QA QB QC QD

L XXX

X

X

XX XXL L L L

Parallel load H H H

X

X

ab cda b c d

Shift right H L H

X

H

XX XXH

QAn QBn QCn

H LH

X

L

XX XXL

QAn QBn QCn

Shift left

H HL

H

X

X X X X QBn QCn QDn H

H HL

L

X

X X X X QBn QCn QDn L

Hold

H LLX

X

X

X X X X QA0 QB0 QC0 QD0

H XXL

X

X

X X X X QA0 QB0 QC0 QD0

H

XX H

X

X

H : high level (Steady state)

L : low level (Steady state)

X : don’t care

X X X X QA0 QB0 QC0 QD0

:

transition from low to high level.

a, b, c, d : the level of steady-state input at inputs A, B, C or D respectively.

QA0, QB0, QC0, QD0 : the level of QA, QB, QC or QD respectively, before the indicated steady-state input

conditions were established.

QAn, QBn, QCn, QDn :

the clock.

the level of QA, QB, QC or QD respectively before the most recent transition of

2

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