RX1+

RX1-1

TX1+

TX1-

CHANNEL 1

EQ1

DE1

Driver

OS1

Receiver/

Equalizer

RX2+

RX2-

TX2+

TX2-

CHANNEL 2

EQ2

DE2

Driver

OS2

Receiver/

Equalizer

4th Generation

State Machine

LFPS

Controller

VCC

GND

Copyright © 2016, Texas Instruments Incorporated

8

TUSB522P

SLLSEV9A – JULY 2016 – REVISED OCTOBER 2016

www.ti.com

Product Folder Links: TUSB522P

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Copyright © 2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TUSB522P is designed to overcome channel loss due to inter-symbol interference and crosstalk when 5

Gbps USB3.1 GEN1 signals travel across a PCB or cable. The dual channel architecture is a one-chip, low-

power solution, extending the possible channel length for transmit and receive data paths in an application. For a

Host application, this enables the system to pass both transmitter compliance and receiver jitter tolerance tests.

The re-driver 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. The

equalization should be set based on the amount of insertion loss in channel 1 or 2 before the TUSB522P

receivers. Likewise, the output drivers support configuration of De-Emphasis. Independent equalization and de-

emphasis control for each channel can be set using EQ1/2 and DE1/2 pins.

The TUSB522P advanced state machine makes it transparent to hosts and devices. After power up, the

TUSB522P periodically performs receiver detection on the TX pairs. If it detects a USB3.1 GEN1 receiver, the

RX termination is enabled, and the TUSB522P is ready to re-drive.

The device ultra-low-power architecture operates at a 3.3-V power supply and achieves Enhanced performance.

The automatic LFPS De-Emphasis control further enables the system to be USB3.1 compliant.

7.2 Functional Block Diagram