SLLSET3 May   2016 TUSB501-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Power Supply 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 Receiver Equalization
      2. 9.3.2 De-Emphasis Control and Output Swing
      3. 9.3.3 Automatic LFPS Detection
      4. 9.3.4 Automatic Power Management
    4. 9.4 Device Functional Modes
      1. 9.4.1 Disconnect Mode
      2. 9.4.2 U Modes
        1. 9.4.2.1 U0 Mode
        2. 9.4.2.2 U2/U3 Mode
  10. 10Application 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
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Community Resources
    2. 13.2 Trademarks
    3. 13.3 Electrostatic Discharge Caution
    4. 13.4 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

9 Detailed Description

9.1 Overview

When 5 Gbps SuperSpeed USB signals travel across a PCB or cable, signal integrity degrades due to loss and inter-symbol interference. The TUSB501-Q1 recovers incoming data by applying equalization that compensates for channel loss, and drives out signals with a high differential voltage. This extends the possible channel length, and enables systems to pass USB 3.0 compliance.

The TUSB501-Q1 advanced state machine makes it transparent to hosts and devices. After power up, the TUSB501-Q1 periodically performs receiver detection on the TX pair. If it detects a SuperSpeed USB receiver, the RX termination is enabled, and the TUSB501-Q1 is ready to re-drive.

The device aggressive Low-Power Architecture operates at a 3.3-V power supply and achieves enhanced performance, as lower as 3 mW with no connection and 126 mW in active state. The receiver equalizer has three gain settings that are controlled by terminal EQ: 3 dB, 6 dB, and 9 dB. The equalization should be set based on amount of insertion loss in the channel before the TUSB501-Q1. Likewise, the output driver supports configuration of De-Emphasis and Output Swing (terminals DE and OS). The automatic LFPS De-Emphasis control further enables the system to be USB3.0 compliant. The TUSB501-Q1 operates over the industrial temperature range of -40ºC to 85ºC in a small 2 x 2 mm WSON package.

Table 1. Control Pin Effects (Typical Values)

PIN DESCRIPTION LOGIC STATE GAIN
EQ Equalization Amount Low 3 dB
Floating 6 dB
High 9 dB
PIN DESCRIPTION LOGIC STATE OUTPUT DIFFERENTIAL VOLTAGE FOR THE TRANSITION BIT
OS Output Swing Amplitude Low 930 mVpp
High 1300 mVpp
PIN DESCRIPTION LOGIC STATE DE-EMPHASIS RATIO (1)
FOR OS = LOW FOR OS = HIGH
DE De-Emphasis Amount Low 0 dB –2.6 dB
Floating –3.5 dB –5.9 dB
High –6.2 dB –8.3 dB
(1) Typical values

9.2 Functional Block Diagram

TUSB501-Q1 fp_circuit_sllseg5.gif

9.3 Feature Description

9.3.1 Receiver Equalization

The purpose of receiver equalization is to compensate for channel insertion loss and inter-symbol interference in the system before the input of the TUSB501-Q1. The receiver overcomes these losses by attenuating the low frequency components of the signals with respect to the high frequency components. The proper gain setting should be selected to match the channel insertion loss before the input of the TUSB501-Q1.

9.3.2 De-Emphasis Control and Output Swing

The differential driver output provides selectable de-emphasis and output swing control in order to achieve USB3.0 compliance. The TUSB501-Q1 offers a unique way to adjust output de-emphasis and transmitter swing based on the OS and DE terminals. The level of de-emphasis required in the system depends on the channel length after the output of the re-driver.

TUSB501-Q1 fig5_transmitter_sllseg5.gif Figure 7. Transmitter Differential Voltage, OS = L

9.3.3 Automatic LFPS Detection

The TUSB501-Q1 features an intelligent low frequency periodic signaling (LFPS) controller. The controller senses the low frequency signals and automatically disables the driver de-emphasis, for full USB3.0 compliance.

9.3.4 Automatic Power Management

The TUSB501-Q1 deploys RX detect, LFPS signal detection and signal monitoring to implement an automatic power management scheme to provide active, U2/U3 and disconnect modes. The automatic power management is driven by an advanced state machine, which is implemented to manage the device such that the re-driver operates smoothly in the links.

9.4 Device Functional Modes

9.4.1 Disconnect Mode

The Disconnect mode is the lowest power state of the TUSB501-Q1. In this state, the TUSB501-Q1 periodically checks for far-end receiver termination on both TX. Upon detection of the far-end receiver’s termination on both ports, the TUSB501-Q1 will transition to U0 mode.

9.4.2 U Modes

9.4.2.1 U0 Mode

The U0 mode is the highest power state of the TUSB501-Q1. Anytime super-speed traffic is being received, theTUSB501-Q1 remains in this mode.

9.4.2.2 U2/U3 Mode

Next to the disconnect mode, the U2/U3 mode is next lowest power state. While in this mode, the TUSB501-Q1 periodically performs far-end receiver detection.