3

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com

SP3203E_00_2080

DEVICE PIN

HUMAN BODY

IEC61000-4-2

TESTED

MODEL

Air Discharge

Direct Contact

Level

Driver Outputs

±5kV

±5kV

±8kV

4

Receiver Inputs

±5kV

±5kV

±8kV

4

The circuit model in Figures  and 2 repre-

sent the typical ESD testing circuit used for

all three methods. The C

with the DC power supply when the first

switch (SW) is on. Now that the capacitor

is charged, the second switch (SW2) is on

while SW switches off. The voltage stored

in the capacitor is then applied through R

the current limiting resistor, onto the device

under test (DUT). In ESD tests, the SW2

switch is pulsed so that the device under

test receives a duration of voltage.

For the Human Body Model, the current

limitingresistor(R

(C

IEC-000-4-2, the current limiting resistor

(R

an 50pF, respectively.

The higher C

the IEC6000-4-2 model are more stringent

than the Human Body Model. The larger

storage capacitor injects a higher voltage

to the test point when SW2 is switched on.

The lower current limiting resistor increases

the current charge onto the test point.

Figure 3. ESD Test Waveform for IEC6000-4-2

t=0ns

t=30ns

0A

5A

30A

t →

Figure 2. ESD Test Circuit for IEC6000-4-2

Table 4. Transceiver ESD Tolerance Levels