SLLSFZ6A November   2024  – February 2025 TUSB5461-Q1

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  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Power Supply Characteristics
    6. 5.6  Control I/O DC Electrical Characteristics
    7. 5.7  USB and DP Electrical Characteristics
    8. 5.8  Timing Requirements
    9. 5.9  Switching Characteristics
    10. 5.10 Typical Characteristics
  7.   Parameter Measurement Information
  8. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 USB 3.2
      2. 6.3.2 DisplayPort
      3. 6.3.3 4-Level Inputs
      4. 6.3.4 Receiver Linear Equalization
    4. 6.4 Device Functional Modes
      1. 6.4.1 Device Configuration in GPIO Mode
      2. 6.4.2 Device Configuration In I2C Mode
      3. 6.4.3 DisplayPort Mode
      4. 6.4.4 Linear EQ Configuration
      5. 6.4.5 Linearity VOD
      6. 6.4.6 VOD Modes
        1. 6.4.6.1 Linearity VOD
        2. 6.4.6.2 Limited VOD
      7. 6.4.7 Transmit Equalization
      8. 6.4.8 USB3.2 Modes
      9. 6.4.9 Downstream Facing Port Adaptive Equalization
        1. 6.4.9.1 Fast Adaptive Equalization in I2C Mode
        2. 6.4.9.2 Full Adaptive Equalization
        3. 6.4.9.3 Full Adaptive Equalization in GPIO Mode (I2C_EN = "F")
    5. 6.5 Programming
      1. 6.5.1 Transition Between Modes
      2. 6.5.2 Pseudocode Examples
        1. 6.5.2.1 Fast AEQ With Linear Redriver Mode
        2. 6.5.2.2 Fast AEQ With Limited Redriver Mode
        3. 6.5.2.3 Full AEQ With Linear Redriver Mode
        4. 6.5.2.4 Full AEQ With Limited Redriver Mode
      3. 6.5.3 TUSB5461-Q1 I2C Address Options
      4. 6.5.4 TUSB5461-Q1 I2C Target Behavior
  9. 7 Register Maps
    1. 7.1 TUSB5461-Q1 Registers
  10. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 USB and DP Upstream Facing Port (USB Host / DP GPU to USB-C Receptacle) Configuration
        2. 8.2.2.2 USB Downstream Facing Port (USB-C Receptacle to USB Host) Configuration
          1. 8.2.2.2.1 Fixed Equalization
          2. 8.2.2.2.2 Fast Adaptive Equalization
          3. 8.2.2.2.3 Full Adaptive Equalization
        3. 8.2.2.3 ESD Protection
      3. 8.2.3 Application Curve
    3. 8.3 System Examples
      1. 8.3.1 USB 3.1 Only
      2. 8.3.2 USB 3.1 and 2-Lane DisplayPort Mode
      3. 8.3.3 DisplayPort Only
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  11. 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
  12. 10Revision History
  13. 11Mechanical, Packaging, and Orderable Information

6.1 Overview

The TUSB5461-Q1 is a VESA DisplayPort Alt Mode over USB Type-C redriving switch that supports DisplayPort data rates up to 8.1Gbps for downstream facing port. The device uses 5th generation USB redriver technology as well as an adaptive equalization feature on the DFP receivers. The device is used for DFP configurations C, D, and E from the VESA DisplayPort Alt Mode over USB Type-C.

The TUSB5461-Q1 provides several levels of receive equalization to compensate for cable and board trace loss due to inter-symbol interference (ISI) when USB 3.2 or DisplayPort 2.1 signals travel across a PCB or cable. The TUSB5461-Q1 requires a 3.3V power supply and comes in an Automotive Grade 2 temperature range.

For a host application, the TUSB5461-Q1 enables the system to pass both transmitter compliance and receiver jitter tolerance tests for USB 3.2 and DisplayPort version 2.1. The redriver recovers incoming data by applying equalization that compensates for channel loss, and drives out signals with a high differential voltage. Each channel has a receiver equalizer with selectable gain settings. Set the equalization based on the amount of insertion loss before the TUSB5461-Q1 receivers. Independent equalization control for each channel can be set using EQ[1:0], SSEQ[1:0], and DPEQ[1:0] pins.

The TUSB5461-Q1 advanced state machine makes the device transparent to hosts and devices. After power up, the TUSB5461-Q1 periodically performs receiver detection on the TX pairs. If the device detects a USB 3.2 receiver, the RX termination is enabled, and the TUSB5461-Q1 is ready to redrive.

The device ultra-low-power architecture operates at a 3.3V power supply and achieves enhanced performance. The automatic LFPS de-emphasis control further enables the system to be USB3.2 compliant.