CD74HC194MTE4 查看數據表（PDF） - Vectron International

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CD74HC194MTE4

High-Speed CMOS Logic 4-Bit Bidirectional Universal Shift Register

Vectron International 

CD54HC194, CD74HC194, CD74HCT194

Functional Diagram

3

D0

4

D1

5

D2

6

D3

DSL

DSR

S0

S1

MR

CP

72

15

Q0

14

Q1

13

Q2

12

Q3

9 10 1 11

GND = 8

VCC = 16

TRUTH TABLE

OPERATING

MODE

Reset (Clear)

CP

MR

X

L

INPUTS

OUTPUT

S1

S0

DSR DSL

Dn

Q0

Q1

Q2

Q3

X

X

X

X

X

L

L

L

L

Hold (Do Nothing)

X

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

dn

d0

d1

d2

d3

H = High Voltage Level,

h = High Voltage Level One Set-up Time Prior To The Low to High Clock Transition,

L = Low Voltage Level,

l = Low Voltage Level One Set-up Time Prior to the Low to High Clock Transition,

dn (qn) = 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,

↑ = Transition from Low to High Level

2

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