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SP2209EEY Datasheet(PDF) 11 Page - Sipex Corporation |
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SP2209EEY Datasheet(HTML) 11 Page - Sipex Corporation |
11 / 15 page 11 SP2209E DS/06 SP2209E High ESD Dual Port RS-232 Transceivers © Copyright 2000 Sipex Corporation equipment that are accessible to personnel during normal usage. The transceiver IC receives most of the ESD current when the ESD source is applied to the connector pins. The test circuit for EN61000-4-2 is shown on Figure 11. There are two methods within EN61000-4-2, the Air Discharge method and the Contact Discharge method. With the Air Discharge Method, an ESD voltage is applied to the equipment under test (EUT) through air. This simulates an electrically charged person ready to connect a cable onto the rear of the system only to find an unpleasant zap just before the person touches the back panel. The high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. This energy, whether discharged directly or through air, is predominantly a function of the 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 Figure 10. ESD Test Circuit for Human Body Model 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 model in Figures 10 and 11 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 EN61000-4-2, 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 EN61000-4-2 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. APPLICATIONS With six drivers and ten receivers, the SP2209E device is ideal for applications requiring two RS-232 ports such as in desktop or portable computers. Refer to Figure 13. For typical DB9 serial ports for Data Terminal Equipment (DTE) R RC C C CSS R RSS SW1 SW1 SW2 SW2 RC Device Under Test DC Power Source CS RS SW1 SW2 |
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