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SP202ECT Datasheet(PDF) 10 Page - Sipex Corporation |
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SP202ECT Datasheet(HTML) 10 Page - Sipex Corporation |
10 / 15 page Date: 7/19/04 SP202E Series High Performance RS232 Transceivers © Copyright 2004 Sipex Corporation 10 SP202E HUMAN BODY IEC1000-4-2 Family MODEL Air Discharge Direct Contact Level Driver Outputs ±15kV ±15kV ±8kV 4 Receiver Inputs ±15kV ±15kV ±8kV 4 Figure 11. ESD Test Waveform for IEC1000-4-2 t=0ns t=30ns 0A 15A 30A t ➙ Table 2. Transceiver ESD Tolerance Levels discharge current rather than the discharge voltage. Variables with an air discharge such as approach speed of the object carrying the ESD potential to the system and humidity will tend to change the discharge current. For example, the rise time of the discharge current varies with the approach speed. The Contact Discharge Method applies the ESD current directly to the EUT. This method 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 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 9 and 10 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 1.5k Ω an 100pF, respectively. For IEC-1000-4- 2, the current limiting resistor (R S) and the source capacitor (C S) are 330Ω 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. |
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