SLVSJO3 August   2025 SN74AHC540-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3.   3
  4. 2 Applications
  5. 3 Description
  6. 4 Pin Configuration and Functions
  7. 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 Noise Characteristics
    8. 5.8 Typical Characteristics
  8. 6 Parameter Measurement Information
  9. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Balanced CMOS 3-State Outputs
      2. 7.3.2 Standard CMOS Inputs
      3. 7.3.3 Wettable Flanks
      4. 7.3.4 Clamp Diode Structure
    4. 7.4 Device Functional Modes
  10. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Typical Application
        1. 8.1.1.1 Design Requirements
          1. 8.1.1.1.1 Power Considerations
          2. 8.1.1.1.2 Input Considerations
          3. 8.1.1.1.3 Output Considerations
        2. 8.1.1.2 Detailed Design Procedure
        3. 8.1.1.3 Application Curves
    2. 8.2 Power Supply Recommendations
    3. 8.3 Layout
      1. 8.3.1 Layout Guidelines
      2. 8.3.2 Layout Example
  11. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  12. 10Revision History
  13. 11Mechanical, Packaging, and Orderable Information

7.1 Overview

The SN74AHC540-Q1 contains 8 individual inverting buffers and 3-state outputs.

Each inverter performs the boolean logic function xYn = xAn, with x being the bank number and n being the channel number.

Both output enables (xOE) control all eight inverters. Both xOE pins must be in the low state to activate the inverters. When one or both of the xOE pins are in the high state, the outputs of all inverters are disabled. All disabled outputs are placed into the high-impedance state.

To ensure the high-impedance state during power up or power down, either xOE pin should be tied to VCC through a pull-up resistor; the minimum value of the resistor is determined by the current sinking capability of the driver and the leakage of the pin as defined in the Electrical Characteristics table.