ZHCSGK5A July 2017 – July 2017 ESD401
PRODUCTION DATA.
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. Customers should validate and test their design implementation to confirm system functionality.
8.1 Application Information
The ESD401 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.
8.2 Typical Application
Figure 12. USB 2.0 ESD Schematic
8.2.1 Design Requirements
For this design example, two ESD401 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 1 are known.
Table 1. Design Parameters
| DESIGN PARAMETER | VALUE |
|---|---|
| Signal range on DP-DM lines | 0 V to 3.6 V |
| Operating frequency on DP-DM lines | up to 240 MHz or 480 Mbps |
8.2.2 Detailed Design Procedure
8.2.2.1 Signal Range
The ESD401 supports signal ranges between –5.5 V and 5.5 V, which supports the USB 2.0 signal range of 0 to 3.6 V on the DM/DP lines..
8.2.2.2 Operating Frequency
The ESD401 has a 0.85 pF (typical) capacitance, which supports the USB 2.0 data rates of 480 Mbps.
8.2.3 Application Curves
Figure 13. Insertion Loss
Figure 14. Eye Diagram - 3-Gbps Signal No Device
Figure 15. Eye Diagram - 3-Gbps Signal With ESD401