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SP385E Datasheet(PDF) 11 Page - Exar Corporation |
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SP385E Datasheet(HTML) 11 Page - Exar Corporation |
11 / 15 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP385E_100_030811 11 DEVICE PIN HUMAN BODy IEC61000-4-2 TESTED MODEL Air Discharge Direct Contact Level Driver Outputs +15kV +15kV +8kV 4 Receiver Inputs +15kV +15kV +8kV 4 The circuit models in Figures 6 and 7 represent 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) 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 R S, 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 1.5kΩan100pF,respectively. ForIEC-61000-4-2, thecurrentlimitingresistor(R S) and the source ca- pacitor (C S) are 330Ω an 150pF, respectively. The higher C S value and lower RS value in the IEC61000-4-2 model are more stringent than the Human Body Model. The larger storage capaci- tor 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 8. ESD Test Waveform for IEC61000-4-2 Figure 7. ESD Test Circuit for IEC61000-4-2 Table 1. Transceiver ESD Tolerance Levels RS and RV add up to 330Ω for IEC61000-4-2. RC Device Under Test DC Power Source CS RS SW1 SW2 RV Contact-Discharge Model t = 0ns t = 30ns 0A 15A 30A t → |
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