Nexperia

74LVC594A

8-bit shift register with output register

7. Functional description

Table 3. Function table

H = HIGH voltage state; L = LOW voltage state; ↑ = LOW-to-HIGH transition; X = don’t care; NC = no change

Input

Output

SHCP STCP

SHR

STR

DS

Q7S

Qn

Function

X

X

L

X

X

L

NC

a LOW-state on SHR only affects the shift register

X

X

X

L

X

NC

L

a LOW-state on STR only affects the storage register

X

↑

L

H

X

L

L

empty shift register loaded into storage register

↑

X

H

X

H

Q6S

NC

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 Q6S) appears on the serial output (Q7S)

X

↑

H

H

X

NC

QnS

contents of shift register stages (internal QnS) are

transferred to the storage register and parallel output stages

↑

↑

H

H

X

Q6S

QnS

contents of shift register shifted through; previous contents of

the shift register is transferred to the storage register and the

parallel output stages

8. Limiting values

Table 4. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).

Symbol Parameter

Conditions

Min

Max

Unit

VCC

supply voltage

-0.5

+6.5

V

IIK

input clamping current

VI < 0 V

-50

-

mA

VI

input voltage

[1]

-0.5

+6.5

V

IOK

output clamping current

VO > VCC or VO < 0 V

-

±50

mA

3-state

[1]

-0.5

6.5

V

VO

output voltage

output HIGH or LOW state

[1]

-0.5

VCC + 0.5 V

IO

output current

VO = 0 V to VCC

-

±50

mA

ICC

supply current

-

100

mA

IGND

ground current

-100

-

mA

Tstg

storage temperature

-65

+150

°C

Ptot

total power dissipation

Tamb = -40 °C to +125 °C

[2]

-

500

mW

[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

[2] For SOT109-1 (SO16) package: Ptot derates linearly with 12.4 mW/K above 110 °C.

For SOT403-1 (TSSOP16) package: Ptot derates linearly with 8.5 mW/K above 91 °C.

For SOT763-1 (DHVQFN16) package: Ptot derates linearly with 11.2 mW/K above 106 °C.

74LVC594A

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© Nexperia B.V. 2020. All rights reserved

Product data sheet

Rev. 4 — 3 September 2020

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