SP3243E datasheet(11/14 Pages) SIPEX

11 / 14 page

Rev.4/08/02

SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers

DEVICE PIN

HUMAN BODY

IEC1000-4-2

TESTED

MODEL

Air Discharge

Direct Contact

Level

Driver Outputs

±15kV

±8kV

Receiver Inputs

±15kV

±8kV

The circuit model in Figures 16 and 17 represent

the typical ESD testing circuit used for all three

methods. The CS is initially charged with the DC

power supply when the first switch (SW1) is on.

Now that the capacitor is charged, the second

switch (SW2) is on while SW1 switches off. The

voltage stored in the capacitor is then applied

through RS, 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 limiting

resistor (R

S) and the source capacitor (CS) are

1.5kW an 100pF, respectively. For IEC-1000-4-

2, the current limiting resistor (R

S) and the source

capacitor (C

S) are 330W an 150pF, respectively.

The higher C

S value and

lower R

S value in the

IEC1000-4-2 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 18. ESD Test Waveform for IEC1000-4-2

t=0ns

t=30ns

15A

30A

t ➙

Figure 17. ESD Test Circuit for IEC1000-4-2

Table 2. Transceiver ESD Tolerance Levels

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

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