SCLS793B March   2020  – October 2026 SN74HCS21

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Balanced CMOS Push-Pull Outputs
      2. 7.3.2 CMOS Schmitt-Trigger Inputs
      3. 7.3.3 Clamp Diode Structure
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Power Considerations
        2. 8.2.1.2 Input Considerations
        3. 8.2.1.3 Output Considerations
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

10 Revision History

Changes from June 30, 2020 to September 29, 2026 (from Revision A (June 2020) to Revision B (October 2026))

  • Updated the numbering format for tables, figures, and cross-references throughout the documentGo
  • Deleted "ICC" and "output" from "Continuous current through VCC or GND" row for clarityGo
  • Changed VT+ limits at 2V VCC from 0.7V (min), 1.5V (max) to 1.13V (min), 1.37V (max) Go
  • Added VT+ typical values at 2V VCC Go
  • Changed VT+ limits at 4.5V VCC from 1.7V (min), 3.15V (max) to 2.31V (min), 2.66V (max) Go
  • Added VT+ typical values at 4.5V VCC Go
  • Changed VT+ limits at 6V VCC from 2.1V (min), 4.2V (max) to 2.99V (min), 3.44V (max) Go
  • Added VT+ typical values at 6V VCC Go
  • Changed VT- limits at 2V VCC from 0.3V (min), 1.0V (max) to 0.55V (min), 0.71V (max)Go
  • Added VT- typical values at 2V VCC Go
  • Changed VT- limits at 4.5V VCC from 0.9V (min), 2.2V (max) to 1.21V (min), 1.50V (max) Go
  • Added VT- typical values at 4.5V VCC Go
  • Changed VT- limits at 6V VCC from 1.2V (min), 3.0V (max) to 1.56V (min), 1.99V (max)Go
  • Added VT- typical values at 6V VCC Go
  • Changed ΔVT limits at 2V VCC from 0.2V (min), 1.0V (max) to 0.54V (min), 0.71V (max)Go
  • Added ΔVT typical values at 2V VCC Go
  • Changed ΔVT limits at 4.5V VCC from 0.4V (min), 1.4V (max) to 0.94V (min), 1.27V (max)Go
  • Added ΔVT typical values at 4.5V VCC Go
  • Changed ΔVT limits at 6V VCC from 0.6V (min), 1.6V (max) to 1.20V (min), 1.57V (max)Go
  • Added ΔVT typical values at 6V VCC Go

Changes from Revision * (March 2020) to Revision A (June 2020)

  • Added D package to data sheet Go
  • Added D Package to Thermal Information TableGo