SNOS748F September   1999  – December 2025 LMC7221

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Specifications
    1. 4.1 Absolute Maximum Ratings
    2. 4.2 Operating Ratings
    3. 4.3 Electrical Characteristics: 2.7 V
    4. 4.4 Electrical Characteristics: 5.0 V and 15.0 V
    5. 4.5 Leakage Characteristics
    6. 4.6 AC Electrical Characteristics
    7. 4.7 Typical Characteristics
  6. 5Application and Implementation
    1. 5.1 Application Information
      1. 5.1.1  Benefits of the LMC7221 Tiny Comparator
        1. 5.1.1.1  Size
        2. 5.1.1.2  Height
        3. 5.1.1.3  Simplified Board Layout
        4. 5.1.1.4  Low Supply Current
        5. 5.1.1.5  Wide Voltage Range
        6. 5.1.1.6  Digital Outputs Representing Signal Level
        7. 5.1.1.7  Open Drain Output
        8. 5.1.1.8  Driving LEDs (Light Emitting Diodes)
        9. 5.1.1.9  Input Range to Beyond Rail to Rail
        10. 5.1.1.10 Zero Crossing Detector
        11. 5.1.1.11 Low Input Currents and High Input Impedance
        12. 5.1.1.12 Direct Sensor Interfacing
      2. 5.1.2  Low Voltage Operation
      3. 5.1.3  Open Drain Output
        1. 5.1.3.1 Output Stage
      4. 5.1.4  Output Short Circuit Current
      5. 5.1.5  Input Protection
      6. 5.1.6  Layout Considerations
      7. 5.1.7  Push-Pull Outputs, Dual Versions
      8. 5.1.8  Additional 5-Pin SOT-23 Tiny Devices
      9. 5.1.9  Spice Macromodel
      10. 5.1.10 Device and Documentation Support
        1. 5.1.10.1 Receiving Notification of Documentation Updates
        2. 5.1.10.2 Support Resources
        3. 5.1.10.3 Trademarks
        4. 5.1.10.4 Electrostatic Discharge Caution
        5. 5.1.10.5 Glossary
  7. 6Device and Documentation Support
    1. 6.1 Receiving Notification of Documentation Updates
    2. 6.2 Support Resources
    3. 6.3 Trademarks
    4. 6.4 Electrostatic Discharge Caution
    5. 6.5 Glossary
  8. 7Revision History
  9. 8Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

5.1.1.9 Input Range to Beyond Rail to Rail

The input common mode range of the LMC7221 is slightly larger than the actual power supply range. This wide input range means that the comparator can be used to sense signals close to the power supply rails. This wide input range can make design easier by eliminating voltage dividers, amplifiers, and other front end circuits previously used to match signals to the limited input range of earlier comparators. This is useful to power supply monitoring circuits which need to sense their own power supply, and compare it to a reference voltage which is close to the power supply voltage. The wide input range can also be useful for sensing the voltage drop across a current sense resistor for battery chargers.