HD74AC194 Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HD74AC194

4-bit Bidirectional Unviersal Shift Register

Hitachi -> Renesas Electronics 

Logic Diagram

HD74AC194

DSL

P3

P2

P1

P0

DSR

S0

S1

CP

MR

D

C

CQ

CL CL

D

C

CQ

CL CL

D

C

CQ

CL CL

D

C

CQ

CL CL

Q3

Q2

Q1

Q0

Mode Select Table

Inputs

Output

Operating Mode

Reset

MR

S1

S0

DSR

DSL

Pn

Q0

Q1

Q2

Q3

L

X

X

X

X

X

L

L

L

L

Hold

H

L

L

X

X

X

q0

q1

q2

q3

Shift Left

H

H

L

X

L

X

q1

q2

q3

L

H

H

L

X

H

X

q1

q2

q3

H

Shift Right

H

L

H

L

X

X

L

q0

q1

q2

H

L

H

H

X

X

H

q0

q1

q2

Parallel Load

H

H

H

X

X

pn

p0

p1

p2

p3

H : HIGH Voltage Level

L : LOW Voltage Level

pn (qn) : Lower case letters indicate the state of the referenced input (or output) one setup time prior to the

LOW-to-HIGH clock transition

X : Immaterial

3

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