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SP213EEA-L Datasheet(PDF) 11 Page - Exar Corporation |
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SP213EEA-L Datasheet(HTML) 11 Page - Exar Corporation |
11 / 19 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309 RS and RV add up to 330Ω for IEC1000-4-2. RC Device Under Test DC Power Source CS RS SW1 SW2 RV Contact-Discharge Model Figure 8. ESD Test Circuit for IEC000-4-2 Figure9.ESDTestWaveformforIEC1000-4-2 The Contact Discharge Method applies the ESDcurrentdirectlytotheEUT.Thismethod was devised to reduce the unpredictability of the ESD arc. The discharge 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 theequipmentfromapersonalreadyholding the equipment. The current is transferred on to the keypad or the serial port of the equipment directly and then travels through thePCBandfinallytotheIC. ThecircuitmodelinFigures7and8represent the typical ESD testing circuit used for all three methods. The C S is initially charged with the DC power supply when the first switch(SW1)ison. Now that the capacitor is charged, the sec- ondswitch(SW2)isonwhileSW1switches off. The voltage stored in the capacitor is then applied through R S, the current limiting resistor,ontothedeviceundertest(DUT). InESDtests,theSW2switchispulsedso that the device under test receives a dura- tion of voltage. For the Human Body Model, the current limitingresistor(R S) and the source capacitor (C S)are1.5kΩan100pF,respectively.For IEC-000-4-2, the current limiting resistor (R S) and the source capacitor (CS)are330Ω an 50pF, respectively. The higher C S value and lower RS value in the IEC000-4-2 model are more stringent than the Human Body Model. The larger storage capacitor injects a higher voltage tothetestpointwhenSW2isswitchedon. The lower current limiting resistor increases the current charge onto the test point. t=0ns t=30ns 0A 5A 30A t |
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