8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The TPDxEUSB30/A family is a family of diode array type transient voltage suppressors (TVS) which are

typically used to provide a path to ground for dissipating ESD events on hi-speed signal lines between a human

interface connector and a system. As the current from ESD passes through the TVS, only a small voltage drop

is present across the diode. This is the voltage presented to the protected IC. The low RDYN of the triggered TVS

holds this voltage, VCLAMP, to a tolerable level to the protected IC.

8.2 Typical Application

This application describes a TPDxEUSB30/A eye pattern test. Figure 10-2 shows the lab board that was

designed to demonstrate the degradation of the eye pattern quality with and without the TPD2EUSB30/A in the

USB 3.0 signal path. The measurements show that there is only ~2 ps jitter penalty to the differential signal

when the TPD2EUSB30/A device is added in the signal path. A similar setup was employed to measure the eye

diagram for the TPD4EUSB30.

Pattern Generator

TPD2EUSB30

USB3.0 Receiver PHY

36” Lossy Transmission Line

Eye Pattern

Measurement Point

Figure 8-1. Measurement Setup to collect the Eye Pattern on a Reference Board with TPD2EUSB30/A

Pattern Generator

USB3.0 Receiver PHY

36” Lossy Transmission Line

Eye Pattern

Measurement Point

Figure 8-2. Measurement Setup to collect the Eye Pattern on a Reference Board with TPD2EUSB30/A

8.2.1 Design Requirements

For this design example, a single TPD2EUSB30/A is used to protect a differential data pair lines, similar to a

USB 3.0 application. Given the USB application, the following parameters are known.

Table 8-1. Design Parameters

DESIGN PARAMETER

VALUE

Signal range on D+, and D–

0 V to 3.3 V

Operating Frequency

2.5 GHz

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TPD2EUSB30, TPD2EUSB30A, TPD4EUSB30

SLVSAC2G – AUGUST 2010 – REVISED JUNE 2021

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Product Folder Links: TPD2EUSB30 TPD2EUSB30A TPD4EUSB30