ZHCSI50B may   2018  – may 2023 LSF0102-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 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 (Translating Down): VCCB = 3.3 V
    7. 6.7  Switching Characteristics (Translating Down): VCCB = 2.5 V
    8. 6.8  Switching Characteristics Translating Up): VCCB = 3.3 V
    9. 6.9  Switching Characteristics (Translating Up): VCCB = 2.5 V
    10. 6.10 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Auto Bidirectional Voltage Translation
      2. 8.3.2 Output Enable
      3. 8.3.3 Device Functional Modes
        1. 8.3.3.1 Up and Down Translation
          1. 8.3.3.1.1 Up Translation
          2. 8.3.3.1.2 Down Translation
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Bidirectional Translation
        1. 9.2.1.1 Design Requirements
          1. 9.2.1.1.1 Enable, Disable, and Reference Voltage Guidelines
          2. 9.2.1.1.2 Bias Circuitry
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Bidirectional Translation
          2. 9.2.1.2.2 Pull-Up Resistor Sizing
          3. 9.2.1.2.3 Application Curve
          4. 9.2.1.2.4 Mixed-Mode Voltage Translation
          5. 9.2.1.2.5 Single Supply Translation
          6. 9.2.1.2.6 Voltage Translation for Vref_B < Vref_A + 0.8 V
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 接收文档更新通知
    3. 10.3 支持资源
    4. 10.4 Trademarks
    5. 10.5 静电放电警告
    6. 10.6 术语表
  12. 11Mechanical, Packaging, and Orderable Information

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9.2.1.2.4 Mixed-Mode Voltage Translation

The supply voltage (VPU) for each channel can be individually set with a pull-up resistor. Figure 9-4 shows an example of this mixed-mode multi-voltage translation. For additional details on multi-voltage translation, see the Multi-voltage Translation with the LSF Family video.

With the Vref_B pulled up to 5 V and Vref_A connected to 1.8 V, all channels will be clamped to 1.8 V at which point a pullup can be used to define the high level voltage for a given channel.

  • Push-Pull Down Translation (5 V to 1.8 V): Channel 1 is an example of this setup. When B1 is 5 V, A1 is clamped to 1.8 V, and when B1 is LOW, A1 is driven LOW through the switch.
  • Push-Pull Up Translation (1.8 V to 5 V): Channel 2 is an example of this setup. When A2 is 1.8 V, the switch is high impedance and the B2 channel is pulled up to 5 V. When A2 is LOW, B2 is driven LOW through the switch.
  • Push-Pull Down Translation (3.3 V to 1.8 V): Channels 3 and 4 are examples of this setup. When either B3 or B4 are driven to 3.3 V, A3 or A4 are clamped to 1.8 V, and when either B3 or B4 are LOW, A3 or A4 are driven LOW through the switch.
  • Open-Drain Bidirectional Translation (3.3 V ↔ 1.8 V): Channels 5 through 8 are examples of this setup. These channels are for bidirectional operation for I2C and MDIO to translate between 1.8 V and 3.3 V with open-drain drivers.

GUID-20230510-SS0I-LTGB-5ZFC-X4CQV4LZHLLK-low.svg Figure 9-4 Multi-Voltage Translation with the LSF010x-Q1