SDLS975A April   2024  – September 2025 LSF0002

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics (Translating Down): BN = 3.3V
    7. 5.7 Switching Characteristics (Translating Down): BN = 2.5V
    8. 5.8 Switching Characteristics (Translating Up): BN = 3.3V
    9. 5.9 Switching Characteristics (Translating Up):BN = 2.5V
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Auto Bidirectional Voltage Translation
      2. 7.3.2 VBIAS/ Enable
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Open-Drain Interface (I2C, PMBus, SMBus, and GPIO)
        1. 8.2.1.1 Design Requirements
          1. 8.2.1.1.1 Enable and Disable Guidelines
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Bidirectional Translation
          2. 8.2.1.2.2 Pull-Up Resistor Sizing
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Mixed-Mode Voltage Translation
      3. 8.2.3 Voltage Translation for Vref_B < Vref_A + 0.8V
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
8.2.1.2.1 Bidirectional Translation

For the bidirectional translation configuration (higher voltage to lower voltage or lower voltage to higher voltage), the VBIAS input must be connected to VEXT,A. This allows VBIAS to regulate the bias of the I/O channels for proper translation. A filter capacitor on VBIAS is recommended for a stable supply at the device. The controller output driver can be push-pull or open-drain (pull-up resistors may be required) and the peripheral device output can be push-pull or open-drain (pull-up resistors are required to pull the Bn outputs to VPU).

Note: If either output is push-pull, data must be unidirectional or the outputs must be tri-state and be controlled by some direction-control mechanism to prevent HIGH-to-LOW bus contention in either direction. If both outputs are open-drain, no direction control is needed.