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SN74HCS21

SCLS793A – MARCH 2020 – REVISED JUNE 2020

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Table of Contents

1

Features .................................................................. 1

2

Applications ........................................................... 1

3

Description ............................................................. 1

4

Revision History..................................................... 2

5

Pin Configuration and Functions ......................... 3

6

Specifications......................................................... 3

6.1

Absolute Maximum Ratings ...................................... 3

6.2

ESD Ratings.............................................................. 4

6.3

Recommended Operating Conditions ....................... 4

6.4

Thermal Information .................................................. 4

6.5

Electrical Characteristics........................................... 4

6.6

Switching Characteristics .......................................... 5

6.7

Typical Characteristics .............................................. 5

7

Parameter Measurement Information .................. 6

8

Detailed Description .............................................. 7

8.1

Overview ................................................................... 7

8.2

Functional Block Diagram ......................................... 7

8.3

Feature Description................................................... 7

8.4

Device Functional Modes.......................................... 8

9

Application and Implementation .......................... 9

9.1

Application Information.............................................. 9

9.2

Typical Application .................................................... 9

10

Power Supply Recommendations ..................... 12

11

Layout................................................................... 12

11.1

Layout Guidelines ................................................. 12

11.2

Layout Example .................................................... 12

12

Device and Documentation Support ................. 13

12.1

Documentation Support ........................................ 13

12.2

Related Links ........................................................ 13

12.3

Community Resources.......................................... 13

12.4

Trademarks ........................................................... 13

12.5

Electrostatic Discharge Caution ............................ 13

12.6

Glossary ................................................................ 13

13

Mechanical, Packaging, and Orderable

Information ........................................................... 13

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Original (March 2020) to Revision A

Page

•

Added D package to data sheet ............................................................................................................................................ 1

•

Added D Package to Thermal Information Table ................................................................................................................... 4