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

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4 Pin Configuration and Functions

SN74HCS21 D or PW Package14-Pin SOIC or TSSOPTop View Figure 4-1 D or PW Package14-Pin SOIC or TSSOPTop View
Table 4-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME NO.
1A 1 I Channel 1, Input A
1B 2 I Channel 1, Input B
NC 3, 11 — Not internally connected
1C 4 I Channel 1, Input C
1D 5 I Channel 1, Input D
1Y 6 O Channel 1, Output Y
GND 7 — Ground
2Y 8 O Channel 2, Output Y
2A 9 I Channel 2, Input A
2B 10 I Channel 2, Input B
2C 12 I Channel 2, Input C
2D 13 I Channel 2, Input D
VCC 14 — Positive Supply
(1) I = input, O = output, P = power, FB = feedback, GND = ground, N/A = not applicable