 2011 - 2014 Microchip Technology Inc.

DS00001824A-page 23

USB375x

5.2

ESD Performance

The USB375x is protected from ESD strikes. By eliminating the requirement for external ESD protection devices, board

space is conserved, and the board manufacturer is enabled to reduce cost. The advanced ESD structures integrated

into the USB375x protect the device whether or not it is powered up.

5.2.1

HUMAN BODY MODEL (HBM) PERFORMANCE

HBM testing verifies the ability to withstand the ESD strikes like those that occur during handling and manufacturing,

and is done without power applied to the IC. To pass the test, the device must have no change in operation or perfor-

mance due to the event. The USB375x HBM performance is detailed in .

5.2.2

EN/IEC 61000-4-2 PERFORMANCE

The EN/IEC 61000-4-2 ESD specification is an international standard that addresses system-level immunity to ESD

strikes while the end equipment is operational. In contrast, the HBM ESD tests are performed at the device level with

the device powered down.

Microchip contracts with Independent laboratories to test the USB375x to EN/IEC 61000-4-2 in a working system.

Reports are available upon request. Please contact your Microchip representative, and request information on 3rd party

ESD test results. The reports show that systems designed with the USB375x can safely provide the ESD performance

shown in without additional board level protection.

In addition to defining the ESD tests, EN/IEC 61000-4-2 also categorizes the impact to equipment operation when the

strike occurs (ESD Result Classification). The USB375x maintains an ESD Result Classification 1 or 2 when subjected

to an EN/IEC 61000-4-2 (level 4) ESD strike.

Both air discharge and contact discharge test techniques for applying stress conditions are defined by the EN/IEC

61000-4-2 ESD document.

FIGURE 5-2:

USB3751 DEVICE APPLICATION DIAGRAM

Applications

Processor

USB

Connector

DP

DM

VBUS

SHIELD

GND

USB3751

I2C_DAT

I2C_CLK

INT_B

VBUS

DP_C

DM_C

GND

DP_1

DM_1

I2C_DAT

I2C_CLK

VOUT

INT_B

VCC

USB

2.0

PHY

PMIC