74HC594DB datasheet(4/10 Pages) PHILIPS

4 / 10 page

December 1991

Philips Semiconductors

Product speciﬁcation

8-bit shift register with output register

74HC/HCT594

FUNCTION TABLE

Note

1. H = HIGH voltage level

L = LOW voltage level

↑ = LOW-to-HIGH transition

NC = no change

X = don’t care.

INPUTS

OUTPUTS

FUNCTION

SHCP

STCP

SHR

STR

Q7’Qn

a LOW level on SHR only affects the shift registers.

XXXL

XNC

a LOW level on STR only affects the storage registers.

↑

empty shift register loaded into storage register.

↑

Q6’

logic HIGH level shifted into shift register stage 0. Contents of all

shift register stages shifted through, e.g. previous state of stage

6 (internal Q6’) appears on the serial output (Q7’).

↑

HHX

Qn’

contents of shift register stages (internal Qn’) are transferred to

the storage register and parallel output stages.

↑↑

HHX

Q6nQn’

contents of shift register shifted through. Previous contents of

shift register transferred to the storage register and the parallel

output stages.

Fig.4 Functional diagram.

handbook, halfpage

MBC320

SHCP

STCP

Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7

SH R

ST R

D S

123

8-STAGE SHIFT REGISTER

8-BIT STORAGE REGISTER

Q7'

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