SLLS373M July   1999  – March 2024 SN65LVDS1 , SN65LVDS2 , SN65LVDT2

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Options
  6. 5 Pin Configuration and Functions
  7. 6 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 Driver Electrical Characteristics
    6. 6.6 Receiver Electrical Characteristics
    7. 6.7 Driver Switching Characteristics
    8. 6.8 Receiver Switching Characteristics
    9. 6.9 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 SN65LVDS1 Features
        1. 8.3.1.1 Driver Output Voltage and Power-On Reset
        2. 8.3.1.2 Driver Offset
        3. 8.3.1.3 5-V Input Tolerance
        4. 8.3.1.4 NC Pins
        5. 8.3.1.5 Driver Equivalent Schematics
      2. 8.3.2 SN65LVDS2 and SN65LVDT2 Features
        1. 8.3.2.1 Receiver Open Circuit Fail-Safe
        2. 8.3.2.2 Receiver Output Voltage and Power-On Reset
        3. 8.3.2.3 Common-Mode Range vs Supply Voltage
        4. 8.3.2.4 General Purpose Comparator
        5. 8.3.2.5 Receiver Equivalent Schematics
        6. 8.3.2.6 NC Pins
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation With VCC < 1.5 V
      2. 8.4.2 Operation With 1.5 V ≤ VCC < 2.4 V
      3. 8.4.3 Operation With 2.4 V ≤ VCC < 3.6 V
      4. 8.4.4 SN65LVDS1 Truth Table
      5. 8.4.5 SN65LVDS2 and SN65LVDT2 Truth Table
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Point-to-Point Communications
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1  Driver Supply Voltage
          2. 9.2.1.2.2  Driver Bypass Capacitance
          3. 9.2.1.2.3  Driver Input Voltage
          4. 9.2.1.2.4  Driver Output Voltage
          5. 9.2.1.2.5  Interconnecting Media
          6. 9.2.1.2.6  PCB Transmission Lines
          7. 9.2.1.2.7  Termination Resistor
          8. 9.2.1.2.8  Driver NC Pins
          9. 9.2.1.2.9  Receiver Supply Voltage
          10. 9.2.1.2.10 Receiver Bypass Capacitance
          11. 9.2.1.2.11 Receiver Input Common-Mode Range
          12. 9.2.1.2.12 Receiver Input Signal
          13. 9.2.1.2.13 Receiver Output Signal
          14. 9.2.1.2.14 Receiver NC Pins
      2. 9.2.2 Application Curve
      3. 9.2.3 Multidrop Communications
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
          1. 9.2.3.2.1 Interconnecting Media
        3. 9.2.3.3 Application Curve
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Microstrip vs. Stripline Topologies
      2. 11.1.2 Dielectric Type and Board Construction
      3. 11.1.3 Recommended Stack Layout
      4. 11.1.4 Separation Between Traces
      5. 11.1.5 Crosstalk and Ground Bounce Minimization
      6. 11.1.6 Decoupling
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Other LVDS Products
    2. 12.2 Third-Party Products Disclaimer
    3. 12.3 Documentation Support
      1. 12.3.1 Related Information
    4. 12.4 Receiving Notification of Documentation Updates
    5. 12.5 Support Resources
    6. 12.6 Trademarks
    7. 12.7 Electrostatic Discharge Caution
    8. 12.8 Glossary
  14. 13Revision History
  15. 14Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
  • DBV|5
Thermal pad, mechanical data (Package|Pins)
Orderable Information
9.2.1.2.11 Receiver Input Common-Mode Range

The SN65LVDS2 and SN65LVDT2 support operation over an input common-mode range that is dependent upon the device supply voltage. Per the recommended conditions table, we see that operation is supported between 0 V and 0.8 V below the supply rail.

For a supply voltage of 3.3 V, operation is available when the input common-mode voltage is between GND and 2.5 V. The receivers are required to meet sensitivity requirements over the whole common-mode input range.

If we return to the transmitter discussions, we recall that the SN65LVDS1 has an output common-mode range of 1.2 V. Using one of the receivers discussed here, we see that valid operation of the communication link will occur when the ground difference between transmitter and receiver is within ~±1 V . The use of differential signaling in LVDS allows operation in an environment where the combination of ground difference and common-mode noise result in a common-mode difference between transmitter and receiver of 1 V. This 1-V potential difference hints at the intended application of LVDS circuits.

Standards such as RS-485 support potential differences of almost 10 V, allowing for communication over distances of greater than 1 km. The intended applications of LVDS devices is more moderate distances, such as those from chip to chip on a board, board to board in a rack, or from rack to nearby rack. When the 1-V potential difference is not adequate, yet the high-speed and low voltage features of LVDS are still needed, the designer can choose from either M-LVDS devices available from TI, or from LVDS devices with extended common-mode ranges, such as the SN65LVDS33.