SP526 datasheet(20/23 Pages) SIPEX

20 / 23 page

Rev: B Date:7/7/04

SP526 Multi–Mode Serial Transceiver

30A

15A

t=0nS

t=30nS

Figure 37. ESD Test Waveform for IEC1000-4-2

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 36. 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

discharge current rather than the discharge

voltage. Variables with an air discharge such as

approach speed of the object carrying the ESD

Table 2. Transceiver ESD Tolerance Levels

Device Pin

Human Body

IEC1000-4-2

Tested

Model

Air Discharge

Direct Contact

Level

Driver Outputs

±15kV

±8kV

Receiver Inputs

±15kV

±8kV

SW1

SW2

Contact-Discharge Module

Device

Under

Test

DC Power

Source

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

Figure 36. ESD Test Circuit for IEC1000-4-2

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