ZHCSLR0C August   2004  – August 2020 SN74AVCH24T245

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  Switching Characteristics
    7. 6.7  Switching Characteristics
    8. 6.8  Switching Characteristics
    9. 6.9  Switching Characteristics
    10. 6.10 Switching Characteristics
    11. 6.11 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.2-V to 3.6-V Power-Supply Range
      2. 8.3.2 Partial-Power-Down Mode Operation
      3. 8.3.3 VCC Isolation
      4. 8.3.4 Bus-Hold Circuitry
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 EnableTimes
    3. 9.3 Typical Application
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
        1. 9.3.2.1 Input Voltage Ranges
        2. 9.3.2.2 Output Voltage Range
      3. 9.3.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
    2. 12.2 Related Documentation
    3. 12.3 Trademarks
    4. 12.4 静电放电警告
    5. 12.5 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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8.3.4 Bus-Hold Circuitry

Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state, which helps with board space savings and reduced component costs. Use of pull-up or pull-down resistors with the bus-hold circuitry is not recommended. See the Bus-Hold Circuit application note for more details. (SCLA015).

Note that the bus-hold circuitry always remains active when the corresponding supply is present (i.e. B port bus-hold circuits are active when VCCB is present, and A port bus-hold circuits are active when VCCA is present). The bus hold circuitry is also active even when the device is in a partial power down state or when the output enable pin is used to place all outputs into high impedance.