SP3203E_05 Datasheet, PDF(14/16 Page) Sipex Corporation – 3V RS-232 Serial Transceiver with Logic Selector and15kV ESD Protection

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SP3203E_05 Datasheet, PDF (14/16 Pages) Sipex Corporation – 3V RS-232 Serial Transceiver with Logic Selector and15kV ESD Protection

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RCC

DC Power

Source

SW1

Contact-Discharge Module

RSS

SW2

Device

CSS

Under

Test

Figure 19. ESD Test Circuit for IEC1000-4-2

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 ) and the source capacitor (C ) are

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

2, the current limiting resistor (RS) and the source

capacitor (CS) are 330W an 150pF, respectively.

The higher CS value and lower RS 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.

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

30A

15A

t=0ns

t=30ns

tâ

Figure 20. ESD Test Waveform for IEC1000-4-2

DEVICE PIN

TESTED

HUMAN BODY

IEC1000-4-2

MODEL

Air Discharge Direct Contact

Driver Outputs

Receiver Inputs

Â±15kV

Â±8kV

Table 2. Transceiver ESD Tolerance Levels

Level

Date: 03/30/05

SP3203E, 3V RS232 Serial Transceiver with Logic Selector and 15kV ESD

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