SP3232EUEASLASHTR datasheet(13/20 Pages) SIPEX

13 / 20 page

Date: 02/31/06

SP3222EU, SP3232EU 3.3V, 1000Kbps RS-232 Transceivers

This method was devised to reduce the

unpredictability of the ESD arc. The dis-

charge current rise time is constant since the

energy is directly transferred without the air-

gap arc. In situations such as hand held

systems, the ESD charge can be directly

discharged to the equipment from a person

already holding the equipment. The current is

transferred on to the keypad or the serial port

of the equipment directly and then travels

through the PCB and finally to the IC.

The circuit models in Figures 20 and 21

represent the typical ESD testing circuits 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.

Figure 20. ESD Test Circuit for Human Body Model

Figure 21. ESD Test Circuit for IEC1000-4-2

SW1

SW2

Device

Under

Test

DC Power

Source

SW1

SW2

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

SP3232EUEA/TR 데이터시트(PDF) 13 Page - Sipex Corporation

SP3232EUEA/TR 데이터시트(HTML) 13 Page - Sipex Corporation

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