74HC166 查看數據表（PDF） - NXP Semiconductors.

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74HC166

8-bit parallel-in/serial out shift register

NXP Semiconductors. 

NXP Semiconductors

74HC166; 74HCT166

8-bit parallel-in/serial out shift register

6. Functional description

Table 3. Function table[1]

Operating modes Inputs

Qn registers

Output

PE

CE

CP

DS

D0 to D7 Q0

Q1 to Q6 Q7

parallel load

I

I



X

I

L

L to L

L

I

I



X

h

H

H to H

H

serial shift

h

I



l

X

L

q0 to q5 q6

h

I



h

X

H

q0 to q5 q6

hold “do nothing”

X

H

X

X

X

q0

q1 to q6 q7

[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;

l = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition;

q = state of the referenced output one set-up time prior to the LOW-to-HIGH clock transition;

X = don’t care;

 = LOW-to-HIGH clock transition.

CP

mode

control

CE

inputs

MR

parallel

inputs

DS

shift/

load

D0

D1

D2

D3

D4

D5

D6

D7

output

Q7

clear

serial shift

H

L

H

L

H

L

H

H

HH L H L H L H

inhibit

serial shift

load

aaa-008820

Fig 6. Typical clear, shift, load, inhibit, and shift sequences

74HC_HCT166

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 3 — 11 September 2013

© NXP B.V. 2013. All rights reserved.

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