SLLSF22H April   2018  – June 2024 ISO1410 , ISO1412 , ISO1430 , ISO1432 , ISO1450 , ISO1452

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Description Continued
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
    1.     Pin Functions: Full-Duplex Device
    2.     Pin Functions: Half-Duplex Device
  8. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Power Ratings
    6. 7.6  Insulation Specifications
    7. 7.7  Safety-Related Certifications
    8. 7.8  Safety Limiting Values
    9. 7.9  Electrical Characteristics: Driver
    10. 7.10 Electrical Characteristics: Receiver
    11. 7.11 Supply Current Characteristics: Side 1 (ICC1)
    12. 7.12 Supply Current Characteristics: Side 2 (ICC2)
    13. 7.13 Switching Characteristics: Driver
    14. 7.14 Switching Characteristics: Receiver
    15. 7.15 Insulation Characteristics Curves
    16. 7.16 Typical Characteristics
  9. 8 Parameter Measurement Information
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Electromagnetic Compatibility (EMC) Considerations
      2. 9.3.2 Failsafe Receiver
      3. 9.3.3 Thermal Shutdown
      4. 9.3.4 Glitch-Free Power Up and Power Down
    4. 9.4 Device Functional Modes
      1. 9.4.1 Device I/O Schematics
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Data Rate and Bus Length
        2. 10.2.2.2 Stub Length
        3. 10.2.2.3 Bus Loading
      3. 10.2.3 Application Curves
        1. 10.2.3.1 Insulation Lifetime
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 PCB Material
    2. 12.2 Layout Example
  14. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
        1. 13.1.1.1 Related Links
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  15. 14Revision History
  16. 15Mechanical, Packaging, and Orderable Information

10.2.2.1 Data Rate and Bus Length

The RS-485 standard has typical curves similar to those shown in Figure 10-4. These curves show the inverse relationship between signaling rate and cable length. If the data rate of the payload between two nodes is lower, the cable length between the nodes can be longer.

ISO1450 ISO1452 ISO1410 ISO1412 ISO1430 ISO1432 Cable Length vs Data Rate CharacteristicsFigure 10-4 Cable Length vs Data Rate Characteristics

Use Figure 10-4 as a guideline for cable selection, data rate, cable length and subsequent jitter budgeting.