74HC_HCT597_15 datasheet(5/23 Pages) PHILIPS

Part #	74HC_HCT597

Description	8-bit shift register with input flip-flops

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Manufacturer	PHILIPS [NXP Semiconductors]

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74HC_HCT597

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Product data sheet

Rev. 3 — 15 April 2014

5 of 23

NXP Semiconductors

74HC597; 74HCT597

8-bit shift register with input flip-flops

6.

Functional description

[1]

H = HIGH voltage level.

L = LOW voltage level.

X = don’t care.

 = positive-going transition.

Table 3.

Function table[1]

Inputs

Function

STCP

SHCP

PL

MR



X

data loaded to input latches



X

L

H

data loaded from inputs to shift register

no clock edge

X

L

H

data transferred from input flip-flops to shift register

X

L

invalid logic, state of shift register is indeterminate

when signals removed

X

H

L

shift register cleared

X



H

shift register clocked Qn = Qn

1, Q0 = DS

Fig 7.

Timing diagram

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