SLDS120H March   2000  – March 2022 TFP401 , TFP401A

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  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 DC Digital I/O Electrical Characteristics
    6. 7.6 DC Electrical Characteristics
    7. 7.7 AC Electrical 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 TMDS Pixel Data and Control Signal Encoding
      2. 9.3.2 TFP401/401A Clocking and Data Synchronization
      3. 9.3.3 TFP401/401A TMDS Input Levels and Input Impedance Matching
      4. 9.3.4 TFP401A Incorporates HSYNC Jitter Immunity
    4. 9.4 Device Functional Modes
      1. 9.4.1 TFP401/401A Modes of Operation
      2. 9.4.2 TFP401/401A Output Driver Configurations
        1. 9.4.2.1 Output Driver Power Down
        2. 9.4.2.2 Drive Strength
        3. 9.4.2.3 Time-Staggered Pixel Output
        4. 9.4.2.4 Power Management
        5. 9.4.2.5 Sync Detect
  10. 10Applications 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 and Control Signals
        2. 10.2.2.2 Configuration Options
        3. 10.2.2.3 Power Supplies Decoupling
      3. 10.2.3 Application Curve
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Layer Stack
      2. 12.1.2 Routing High-Speed Differential Signal Traces (RxC–, RxC+, Rx0–, Rx0+, Rx1–, Rx1+, Rx2–, Rx2+)
      3. 12.1.3 DVI Connector
    2. 12.2 Layout Example
    3. 12.3 TI PowerPAD 100-TQFP Package
  13. 13Device and Documentation Support
    1. 13.1 Receiving Notification of Documentation Updates
    2. 13.2 Support Resources
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

9.4.2.5 Sync Detect

The TFP401/401A offers an output, SCDT, to indicate link activity. The TFP401/401A monitors activity on DE to determine if the link is active. When 1 million (1e6) pixel clock periods pass without a transition on DE, the TFP401/401A considers the link inactive, and SCDT is driven low. While SCDT is low, if two DE transitions are detected within 1600 pixel clock periods, the link is considered active, and SCDT is pulled high.

SCDT can be used to signal a system power management circuit to initiate a system power down when the link is considered inactive. The SCDT can also be tied directly to the TFP401/401A PDO input to power down the output drivers when the link is inactive. It is not recommended to use SCDT to drive the PD input, because once in complete power-down, the analog inputs are ignored and the SCDT state does not change. An external system power-management circuit to drive PD is preferred.