SLLSFC6E November   2021  – July 2025 ISOUSB111

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 L2 Power Management State (Suspend) and Resume
      9. 7.3.9 L1 Power Management State (Sleep) and Resume
    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
    2. 8.2 Power Supply Recommendations
    3. 8.3 Layout
      1. 8.3.1 Layout Guidelines
        1. 8.3.1.1 Layout Example
        2. 8.3.1.2 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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.4 Connect and Speed Detection

When there is no peripheral device connected to the downstream side of ISOUSB111, internal 15 kΩ pulldown resistors on DD+ and DD- pins pull the bus lines to zero, creating an SE0 state. When either the DD+ or DD- lines is pulled up higher than the VIH threshold, for a time period higher than TFILTCONN, the ISOUSB111 device treats this as a connect. The ISOUSB111 device configures internal pull-up on the upstream side to match the pull-up detected on the downstream side. After connect is detected, the ISOUSB111 device waits for a reset to be asserted by the host/hub on the upstream side. Depending on whether DD+ or DD- is pulled up at the start of reset, the speed of the ISOUSB111 repeater is set. Once set, the speed of the repeater can only be changed after a power down or disconnect event.