SLLSFT6 April   2026 THVD9491-SP

ADVANCE INFORMATION  

  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 ESD Ratings [IEC]
    4. 5.4 Recommended Operating Conditions
    5. 5.5 Thermal Information
    6. 5.6 Power Dissipation
    7. 5.7 Electrical Characteristics
    8. 5.8 Switching Characteristics: 20Mbps
    9. 5.9 Switching Characteristics: 50Mbps
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Bus Fault Protection
      2. 7.3.2 Integrated IEC ESD and EFT Protection
      3. 7.3.3 Driver Overvoltage and Overcurrent Protection
      4. 7.3.4 Enhanced Receiver Noise Immunity
      5. 7.3.5 Receiver Fail-Safe Operation
      6. 7.3.6 Low-Power Shutdown Mode
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Typical Application
      1. 8.1.1 Design Requirements
      2. 8.1.2 Detailed Design Procedure
      3. 8.1.3 Application Curve
    2. 8.2 Power Supply Recommendations
    3. 8.3 Layout
      1. 8.3.1 Layout Guidelines
      2. 8.3.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1.     PACKAGE OPTION ADDENDUM
    2. 11.1 Tape and Reel Information
    3. 11.2 Mechanical Data

4 Pin Configuration and Functions

THVD9491-SP THVD9491-SP 14-Pin D Package (SOIC) Top ViewFigure 4-1 THVD9491-SP
14-Pin D Package (SOIC)
Top View
Table 4-1 Pin Functions
NAMENO.TYPEDESCRIPTION
VIO1Logic Supply1.65V to 5.5V supply for logic I/O signals (R, RE, D, DE, and SLR)
R2Digital OutputReceive data output
RE3Digital InputReceiver enable input
DE4Digital InputDriver enable input
D5Digital InputTransmission data input
GND6Reference PotentialLocal device ground
NC7,13No ConnectNot connected internally.
SLR8Digital InputSlew rate selection pin: Low = 50Mbps, High = 20Mbps. Defaults to 50Mbps if left floating.
Y9Bus OutputRS-485 bus output, Y
Z10Bus OutputRS-485 bus output, Z
B11Bus InputRS-485 bus input, B
A12Bus InputRS-485 bus input, A
VCC14Bus Supply3V to 5.5V supply for A and B bus lines