SLLSFC5C November   2021  – January 2023 ISOUSB211

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Revision History
  6. Pin Configuration and Functions
  7. 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  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Switching Characteristics
    11. 6.11 Insulation Characteristics Curves
    12. 6.12 Typical Characteristics
  8. Parameter Measurement Information
    1. 7.1 Test Circuits
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Power Supply Options
      2. 8.3.2  Power Up
      3. 8.3.3  Symmetric Operation, Dual-Role Port and Role-Reversal
      4. 8.3.4  Connect and Speed Detection
      5. 8.3.5  Disconnect Detection
      6. 8.3.6  Reset
      7. 8.3.7  LS/FS Message Traffic
      8. 8.3.8  HS Message Traffic
      9. 8.3.9  Equalization and Pre-emphasis
      10. 8.3.10 L2 Power Management State (Suspend) and Resume
      11. 8.3.11 L1 Power Management State (Sleep) and Resume
      12. 8.3.12 HS Test Mode Support
      13. 8.3.13 CDP Advertising
    4. 8.4 Device Functional Modes
  10. Power Supply Recommendations
  11. 10Application and Implementation
    1. 10.1 Typical Application
      1. 10.1.1 Isolated Host or Hub
      2. 10.1.2 Isolated Peripheral - Self-Powered
      3. 10.1.3 Isolated Peripheral - Bus-Powered
      4. 10.1.4 Application Curve
        1. 10.1.4.1 Insulation Lifetime
    2. 10.2 Meeting USB2.0 HS Eye-Diagram Specifications
    3. 10.3 Thermal Considerations
      1. 10.3.1 VBUS / V3P3V Power
      2. 10.3.2 VCCx / V1P8Vx Power
      3. 10.3.3 Example Configuration 1
      4. 10.3.4 Example Configuration 2
      5. 10.3.5 Example Configuration 3
  12. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Layout Example
      2. 11.1.2 PCB Material
  13. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  14. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Tape and Reel Information

Insulation Lifetime

Insulation lifetime projection data is collected by using industry-standard Time Dependent Dielectric Breakdown (TDDB) test method. In this test, all pins on each side of the barrier are tied together creating a two-terminal device and high voltage applied between the two sides; See Figure 10-4 for TDDB test setup. The insulation breakdown data is collected at various high voltages switching at 60 Hz over temperature. For reinforced insulation, VDE standard requires the use of TDDB projection line with failure rate of less than 1 part per million (ppm). Even though the expected minimum insulation lifetime is 20 years at the specified working isolation voltage, VDE reinforced certification requires additional safety margin of 20% for working voltage and 50% for lifetime which translates into minimum required insulation lifetime of 30 years at a working voltage that's 20% higher than the specified value.  

Figure 10-5 shows the intrinsic capability of the isolation barrier to withstand high voltage stress over its lifetime. Based on the TDDB data, the intrinsic capability of the insulation is 1500 VRMS with a lifetime of 169 years. Other factors, such as package size, pollution degree, material group, etc. can further limit the working voltage of the component. The working voltage of DP-28 package is specified upto 1500 VRMS. At the lower working voltages, the corresponding insulation lifetime is much longer than 169 years.

GUID-10B70A5D-5BD1-41CE-BC33-46C923D478D2-low.gifFigure 10-4 Test Setup for Insulation Lifetime Measurement
GUID-20220721-SS0I-PCNS-WGTP-8BN47M4DDGTH-low.png Figure 10-5 Insulation Lifetime Projection Data