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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9.2.1.1.1 Enable, Disable, and Reference Voltage Guidelines

The LSF0102-Q1 device has an EN input that is used to disable the device by setting EN LOW, which places all I/Os in the high-impedance state. Since LSF family is switch-type voltage translator, the power consumption is very low. It is recommended to always enable LSF0102-Q1 device for bidirectional applications by connecting the EN pin to the Vref_B pin, as shown in Figure 9-1. For additional details on setting up the Vref_A, Vref_B, and EN pins, see the Understanding the Bias Circuit for the LSF Family video.

Table 9-1 Application Operating Condition
PARAMETERMINTYPMAXUNIT
Vref_A(1)reference voltage (A)0.955.5V
Vref_Breference voltage (B)Vref_A + 0.85.5V
VI(EN)input voltage on EN pinVref_A + 0.8Vref_B5.5V
VPUpull-up supply voltage0Vref_BV
(1) Vref_A is required to be the lowest voltage level across all inputs and outputs.

The 200 kΩ, bias resistor is required to allow Vref_B to regulate the EN input. A filter capacitor on Vref_B is recommended. Also Vref_B and VI(EN) are recommended to be 1.0 V higher than Vref_A for best signal integrity.