ZHCSRT9E january   2007  – march 2023 TXB0101

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 Specification
    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  Timing Requirements, VCCA = 1.2 V
    7. 6.7  Timing Requirements, VCCA = 1.5 V ± 0.1 V
    8. 6.8  Timing Requirements, VCCA = 1.8 V ± 0.15 V
    9. 6.9  Timing Requirements, VCCA = 2.5 V ± 0.2 V
    10. 6.10 Timing Requirements, VCCA = 3.3 V ± 0.3 V
    11. 6.11 Switching Characteristics, VCCA = 1.2 V
    12. 6.12 Switching Characteristics, VCCA = 1.5 V ± 0.1 V
    13. 6.13 Switching Characteristics, VCCA = 1.8 V ± 0.15 V
    14. 6.14 Switching Characteristics, VCCA = 2.5 V ± 0.2 V
    15. 6.15 Switching Characteristics, VCCA = 3.3 V ± 0.3 V
    16. 6.16 Operating Characteristics
    17. 6.17 Typical Characteristics
      1.      Parameter Measurement Information
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Architecture
      2. 7.3.2 Power Up
      3. 7.3.3 Enable and Disable
      4. 7.3.4 Pullup or Pulldown Resistors on I/O Lines
    4. 7.4 Device Functional Modes
  8. 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 Input Driver Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 支持资源
    3. 9.3 Trademarks
    4. 9.4 静电放电警告
    5. 9.5 术语表
  10. 10Mechanical, Packaging, and Orderable Information

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8.2.2 Detailed Design Procedure

To begin the design process, determine the following:

  • Input voltage range
    • Use the supply voltage of the device that is driving the TXB0101 device to determine the input voltage range. For a valid logic HIGH the value must exceed the VIH of the input port. For a valid logic LOW the value must be less than the VIL of the input port.
  • Output voltage range
    • Use the supply voltage of the device that the TXB0101 device is driving to determine the output voltage range.
    • External pullup or pulldown resistors are not recommended. If mandatory, TI recommends the value should be larger than 50 kΩ.
  • An external pulldown or pullup resistor decreases the output VOH and VOL. Use Equation 1 and Equation 2 to draft estimate the VOH and VOL as a result of an external pulldown and pullup resistor.
    Equation 1. VOH = VCCx × RPD / (RPD + 4.5 kΩ)
    Equation 2. VOL = VCCx × 4.5 kΩ / (RPU + 4.5 kΩ)

    where

    • VCCx is the output port supply voltage on either VCCA or VCCB
    • RPD is the value of the external pulldown resistor
    • RPU is the value of the external pullup resistor
    • 4.5 kΩ is the counting the variation of the serial resistor 4 kΩ in the I/O line.