SLLSFC5D November   2021  – April 2025 ISOUSB211

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  Power Ratings
    6. 5.6  Insulation Specifications
    7. 5.7  Safety-Related Certifications
    8. 5.8  Safety Limiting Values
    9. 5.9  Electrical Characteristics
    10. 5.10 Switching Characteristics
    11. 5.11 Insulation Characteristics Curves
    12. 5.12 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Test Circuits
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Power Supply Options
      2. 7.3.2  Power Up
      3. 7.3.3  Symmetric Operation, Dual-Role Port, and Role-Reversal
      4. 7.3.4  Connect and Speed Detection
      5. 7.3.5  Disconnect Detection
      6. 7.3.6  Reset
      7. 7.3.7  LS/FS Message Traffic
      8. 7.3.8  HS Message Traffic
      9. 7.3.9  Equalization and Pre-emphasis
      10. 7.3.10 L2 Power Management State (Suspend) and Resume
      11. 7.3.11 L1 Power Management State (Sleep) and Resume
      12. 7.3.12 HS Test Mode Support
      13. 7.3.13 CDP Advertising
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Typical Application
      1. 8.1.1 Isolated Host or Hub
      2. 8.1.2 Isolated Peripheral - Self-Powered
      3. 8.1.3 Isolated Peripheral - Bus-Powered
      4. 8.1.4 Application Curve
        1. 8.1.4.1 Insulation Lifetime
      5. 8.1.5 Meeting USB 2.0 HS Eye-Diagram Specifications
    2. 8.2 Thermal Considerations
      1. 8.2.1 VBUS / V3P3V Power
      2. 8.2.2 VCCx / V1P8Vx Power
      3. 8.2.3 Example Configuration 1
      4. 8.2.4 Example Configuration 2
      5. 8.2.5 Example Configuration 3
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Layout Example
        2. 8.4.1.2 PCB Material
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 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
    1. 11.1 Tape and Reel Information

7.3.3 Symmetric Operation, Dual-Role Port, and Role-Reversal

ISOUSB211 supports symmetric operation. Normally, UD+ and UD- are upstream facing ports and connect to a host or hub. DD+ and DD- are downstream facing ports and connect to a peripheral. However, connecting UD+ and UD- to a peripheral and DD+ and DD- to a host or hub is also possible. Whichever side sees a connect first (D+ or D- pulled up to 3.3 V) becomes the downstream facing side. This feature enables implementation of dual-role port (for example Type-C dual-role port) and role-reversal (for example OTG Host Negotiation Protocol - HNP). Refer to How to Implement an Isolated USB 2.0 High-Speed, Type-C® DRP application note for details. In the rest of this document, DD+/DD- are treated as downstream facing ports, and UD+/UD- as upstream facing ports, but the various operations and features described are equally applicable if this assignment is swapped.