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SP207EET-L Datasheet(PDF) 10 Page - Exar Corporation |
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SP207EET-L Datasheet(HTML) 10 Page - Exar Corporation |
10 / 19 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309 0 ESD TOLERANCE The SP207E Family incorporates rug- gedized ESD cells on all driver output and receiver input pins. The ESD struc- ture is improved over our previous fam- ily for more rugged applications and environments sensitive to electro-static discharges and associated transients. The improved ESD tolerance is at least +5kV without damage nor latch-up. There are different methods of ESD testing applied: a) MIL-STD-883, Method 305.7 b) IEC000-4-2 Air-Discharge c) IEC000-4-2 Direct Contact The Human Body Model has been the generally accepted ESD testing method for semiconductors. This method is also specifiedinMIL-STD-883,Method3015.7 for ESD testing. The premise of this ESD testisto simulate the human body’spotential to store electro-static energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 7. This method will test the IC’s capability to withstand an ESD transient during normal handling such as in manu- facturing areas where the ICs tend to be handled frequently. The IEC-000-4-2, formerly IEC80-2, is generallyusedfortestingESDonequipment and systems. For system manufacturers, RC Device Under Test DC Power Source CS RS SW1 SW2 theymustguaranteeacertainamountofESD protection since the system itself is exposed to the outside environment and human pres- ence. The premise with IEC000-4-2 is that thesystemisrequiredtowithstandanamount of static electricity when ESD is applied to points and surfaces of the 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 IEC000-4-2 is shown on Figure 8. There are two methods within IEC000-4-2, 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)throughair.Thissimulatesan electrically charged person ready to connect a cable onto the rear of the system only to findanunpleasantzapjustbeforetheperson 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 throughair,ispredominantlyafunctionofthe discharge current rather than the discharge voltage. Variableswithanairdischargesuch asapproachspeedoftheobjectcarryingthe 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. Figure 7. ESD Test Circuit for Human Body Model |
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