SLLSFS1B August   2023  – April 2024 THVD4431

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  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_RS-485_500kbps
    9. 5.9  Switching Characteristics_RS-485_20Mbps
    10. 5.10 Switching Characteristics, Driver_RS232
    11. 5.11 Switching Characteristics, Receiver_RS232
    12. 5.12 Switching Characteristics_MODE switching
    13. 5.13 Switching Characteristics_RS-485_Termination resistor
    14. 5.14 Switching Characteristics_Loopback mode
    15. 5.15 Typical Characteristics
  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 Integrated IEC ESD and EFT Protection
      2. 7.3.2 Protection Features
      3. 7.3.3 RS-485 Receiver Fail-Safe Operation
      4. 7.3.4 Low-Power Shutdown Mode
      5. 7.3.5 On-chip Switchable Termination Resistor
      6. 7.3.6 Operational Data Rate
      7. 7.3.7 Diagnostic Loopback
      8. 7.3.8 Integrated Charge pump for RS-232
    4. 7.4 Device Functional Modes
      1. 7.4.1 RS-485 Functionality
      2. 7.4.2 RS-232 Functionality
      3. 7.4.3 Mode Control
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Data Rate and Bus Length for RS-485
        2. 8.2.1.2 Stub Length for RS-485 Network
        3. 8.2.1.3 Bus Loading for RS-485 Network
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    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

Package Options

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

7.4.3 Mode Control

RS-232 3T5R to RS-232 loopback mode transition and RS-232 loopback mode to RS-232 3T5R direct mode transition is not allowed. These 2 mode transitions must go through shutdown mode in between. Rest all combination of mode transitions are allowed.

Table 7-8 MODE Control Function Table
MODE2 MODE1 MODE0 Operating mode Function
X Logic low Logic low RS-232 loopback, charge pump is ON, V+/V- are regulated L3 reflects on L2/R2/R3; L4 reflects on L1/R4/R1; L6 reflects on L5, L7, L8, R5, R6, R7 and R8
X Logic low Logic high RS-232 3T5R mode, charge pump is ON, V+/V- are regulated 3T5R mode; L3, L4, L6 are Logic inputs for RS232 driver; L1, L2, L5, L7, L8 are Logic outputs
X Logic high Logic low RS-485 half duplex mode (charge pump is off) L2 is RX Logic output; L3 is Driver Logic input; R1 R2 are Bus inverting and non-inverting terminals respectively
Logic low or float Logic high Logic high RS-485 full duplex mode (charge pump is off) R1R2 are inverting and non-inverting driver terminals; R3R4 are non-inverting and inverting receiver terminals.
Logic high Logic high Logic high RS-485 loopback mode (charge pump is off) R1, R2, R3, R4 continue to be bus terminals and reflect data on L3; DIR is don't care in this mode; TERM_RX not supported. External termination on R3/R4 not supported. R1/R2 can have internal or external termination.