SLLS872J January   2008  – March 2023 SN65HVD1785 , SN65HVD1786 , SN65HVD1787 , SN65HVD1791 , SN65HVD1792 , SN65HVD1793

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Product Selection Guide
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings (1)
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Thermal Considerations
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Hot-Plugging
      2. 9.3.2 Receiver Failsafe
      3. 9.3.3 70-V Fault-Protection
      4. 9.3.4 Additional Options
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
        1. 10.2.1.1 Data Rate and Bus Length
        2. 10.2.1.2 Stub Length
        3. 10.2.1.3 Receiver Failsafe
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curve
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
    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
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

9.3.3 70-V Fault-Protection

The SN65HVD17xx family of RS-485 devices is designed to survive bus pin faults up to ±70V. The devices designed for fast signaling rate (10 Mbps) will not survive a bus pin fault with a direct short to voltages above 30V when:

1.the device is powered on AND
2a.the driver is enabled (DE=HIGH) AND D=HIGH AND the bus fault is applied to the A pin OR
2b.the driver is enabled (DE=HIGH) AND D=LOW AND the bus fault is applied to the B pin
Under other conditions, the device will survive shorts to bus pin faults up to 70V. #GUID-1CDA6C74-7E4F-4C2F-9F82-96A643C0F817/SLLS8729999 summarizes the conditions under which the device may be damaged, and the conditions under which the device will not be damaged.

Table 9-1 Device Conditions
POWERDEDABRESULTS
OFFXX-70V < VA < 70V-70V < VB < 70VDevice survives
ONLOX-70V < VA < 70V-70V < VB < 70VDevice survives
ONHIL-70V < VA < 70V-70V < VB < 30VDevice survives
ONHIL-70V < VA < 70V30V < VBDamage may occur
ONHIH-70V < VA < 30V-70V < VB < 30VDevice survives
ONHIH30V < VA-70V < VB < 30VDamage may occur