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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9.2.1.2.2 Pull-Up Resistor Sizing

To maintain an appropriate output low voltage, the pull-up resistor value should limit the current through the pass transistor when it is in the ON state to less than 15 mA. This ensures a pass voltage of 260 mV to 350 mV. To set the current through each pass transistor at 15 mA, the pull-up resistor value can be calculated using the following equation:

Equation 3. Rpu = (Vpu - 0.35 V)0.015 A 

The appropriate pull up resistor will depend on the current requirements of the application. Table 9-2 provides resistor values, reference voltages, and currents at 15 mA, 10 mA, and 3 mA. The resistor value shown in the +10% column (or a larger value) should be used to ensure that the pass voltage of the transistor is 350 mV or less. The external driver must be able to sink the total current from the resistors on both sides of the LSF0102-Q1 device at 0.175 V, although the 15 mA applies only to current flowing through the LSF0102-Q1.

Table 9-2 Pull-up Resistor Values
VPU

8 mA

5 mA

3 mA
NOMINAL (Ω)+10%(1) (Ω)NOMINAL (Ω)+10%(1) (Ω)NOMINAL (Ω)+10%(1) (Ω)
5 V

581

639

930

1023

15501705
3.3 V

369

406

590

649

9831082
2.5 V

269

296

430

473

717788
1.8 V

181

199

290

319

483532
1.5 V

144

158

230

253

383422
1.2 V

106

117

170

187283312
(1) +10% to compensate for VDD range and resistor tolerance