7 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.

7.1 Application Information

The ESD321 is a diode type TVS which is used to provide a path to ground for dissipating ESD events on

high-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 safe level for the protected IC.

7.2 Typical Application

5-V Source

USB Transceiver

2

1

2

1

VBUS

D±

D+

GND

Figure 7-1. USB 2.0 ESD Schematic

7.2.1 Design Requirements

For this design example, two ESD321 devices are being used in a USB 2.0 application. This provides a

complete ESD protection scheme.

Given the USB 2.0 application, the parameters listed in Table 7-1 are known.

Table 7-1. Design Parameters

DESIGN PARAMETER

VALUE

Signal range on DP-DM lines

0V to 3.6V

Operating frequency on DP-DM lines

up to 240MHz

7.2.2 Detailed Design Procedure

7.2.2.1 Signal Range

The ESD321 supports signal ranges between 0V and 3.6V, which supports the USB 2.0 signal pair on the USB

2.0 application.

7.2.2.2 Operating Frequency

The ESD321 has a 0.9pF (typical) capacitance, which supports the USB 2.0 data rates of 480Mbps.

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ESD321

SLVSEN8C – JULY 2018 – REVISED JUNE 2025

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