Date: 7/19/04

SP202E Series High Performance RS232 Transceivers

© Copyright 2004 Sipex Corporation

9

SW1

SW2

Device

Under

Test

DC Power

Source

SW1

SW2

Figure 9. ESD Test Circuit for Human Body Model

RS and RV add up to 330Ω for IEC1000-4-2.

RS and RV add up to 330Ω for IEC1000-4-2.

Contact-Discharge Module

SW1

SW2

Device

Under

Test

DC Power

Source

SW1

SW2

Contact-Discharge Module

Figure 10. ESD Test Circuit for IEC1000-4-2

with IEC1000-4-2 is that the system is required

to withstand an amount of static electricity when

ESD is applied to points and surfaces of the

equipment that are accessible to personnel during

normal usage. The transceiver IC receives most

of the ESD current when the ESD source is

applied to the connector pins. The test circuit for

IEC1000-4-2 is shown on Figure 10. There are

two methods within IEC1000-4-2, the Air

Discharge method and the Contact Discharge

method.

With the Air Discharge Method, an ESD voltage

is applied to the equipment under test (EUT)

through air. This simulates an electrically charged

person ready to connect a cable onto the rear of

the system only to find an unpleasant zap just

before the person touches the back panel. The

high energy potential on the person discharges

through an arcing path to the rear panel of the

system before he or she even touches the system.

This energy, whether discharged directly or

through air, is predominantly a function of the