Diodes 74HC594 Manuel d'utilisateur télécharger pdf (Page 3)

74AHC594

Document number: DS35484 Rev. 3 - 2

3 of 10

www.diodes.com

June 2013

74HC594

Functional Description and Timing Diagram

Control Input Output

Function

SHR STR

SHCP STCP DS Q7S Qn

L X X X X L NC Clear Shift Register

X L X X X NC L Clear Storage Register

H X



L H or L Q6S NC

Loads DS into shift register stage 0. All Q

shifted

H H X



X NC Qs

Contents of shift register moved to starge register all Q

-> Q

H H

 

H or L Q6S QnS

Shift Register one pulse count ahead of storage register.

H=HIGH voltage state

L=LOW voltage state

=LOW to HIGH transition

X= don’t care – high or low (not floating)

NC= No change

SHCP

STCP

SHR

STR

Q7S

Absolute Maximum Ratings (Note 4) (@T

= +25°C, unless otherwise specified.)

Symbol Description Rating Unit

ESD HBM Human Body Model ESD Protection 2 KV

ESD CDM Charged Device Model ESD Protection 1 KV

ESD MM Machine Model ESD Protection 200 V

Supply Voltage Range -0.5 to +7.0 V

Input Voltage Range -0.5 to +7.0 V

Voltage applied to output in high or low state

-0.3 to V

+0.5

Input Clamp Current V

< -0.5V

-20 mA

Input Clamp Current VI > Vcc +0.5V 20 mA

Output Clamp Current V

<-0.5V

-20 mA

Output Clamp Current V

> V

+ 0.5V

20 mA

Continuous output current

Q7 standard output ±25 mA

Qn bus driver outputs ±35 mA

Continuous current through Vcc 70 mA

GND

Continuous current through GND -70 mA

Operating Junction Temperature -40 to +150 °C

STG

Storage Temperature -65 to +150 °C

TOT

Total Power Dissipation 500 mW

Note: 4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should be

within recommend values.

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Diodes 74HC594 Manuel d'utilisateur Page 3

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