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MAX3322E Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3322E Datasheet(HTML) 8 Page - Maxim Integrated Products |
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8 / 13 page  IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not refer specifically to integrated circuits. The MAX3322E/ MAX3323E help the user design equipment that meets level 4 of IEC 1000-4-2, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is a higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 7 shows the IEC 1000-4-2 model. Figure 8 shows the current waveform it generates when discharged into a low impedance. The Air-Gap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized. Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis- tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports. Applications Information The capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci- tors for 3.3V operation. For other supply voltages, see Table 2 for required capacitor values. Do not use val- ues smaller than those listed in Table 2. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple ±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications 8 ____________________________________________________ CHARGE-CURRENT- LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 100pF RC 1M Ω RD 1.5k Ω HIGH- VOLTAGE DC SOURCE DEVICE UNDER TEST Figure 5. Human Body ESD Test Model IP 100% 90% 36.8% tRL TIME tDL CURRENT WAVEFORM PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) Ir 10% 0 0 AMPERES Figure 6. Human Body Model Current Waveform CHARGE-CURRENT- LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 150pF RC 50 Ω to 100Ω RD 330 Ω HIGH- VOLTAGE DC SOURCE DEVICE UNDER TEST Figure 7. IEC 1000-4-2 ESD Test Model tr = 0.7ns TO 1ns 30ns 60ns t 100% 90% 10% I Figure 8. IEC 1000-4-2 ESD Generator Current Waveform |
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