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MAX1488 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1488 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page IEC1000-4-2 The IEC1000-4-2 standard covers ESD testing and per- formance of finished equipment; it does not specifically refer to integrated circuits. The MAX1488E helps you design equipment that meets Level 4 (the highest level) of IEC1000-4-2, without additional ESD-protection com- ponents. The major difference between tests done using the Human Body Model and IEC1000-4-2 is higher peak current in IEC1000-4-2. Because series resistance is lower in the IEC1000-4-2 ESD test model (Figure 3a), the ESD withstand voltage measured to this standard is generally lower than that measured using the Human Body Model. Figure 3b shows the current waveform for the ±6kV IEC1000-4-2 Level 4 ESD Contact-Discharge test. The Air-Gap test involves approaching the device with a charged probe. The Contact-Discharge method con- nects the probe to the device before the probe is ener- gized. Machine Model The Machine Model for ESD testing uses a 200pF stor- age capacitor and zero-discharge resistance. Its objec- tive is to mimic the stress caused by contact that occurs with handling and assembly during manufactur- ing. Of course, all pins (not just RS-232 inputs and out- puts) require this protection during manufacturing. Therefore, the Machine Model is less relevant to the I/O ports than the Human Body Model and IEC1000-4-2. __________Applications Information Use proper layout to ensure other devices on your board are not damaged in an ESD strike. Currents as high as 60A can instantaneously pass into the ground, so it is important to minimize the ground-lead return path to the power supply. A separate return path to the power supply is recommended. Trace widths should be greater than 40 mils. VCC and VEE must be bypassed with 0.1µF capacitors as close to the part as possible to ensure maximum ESD protection. ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver _______________________________________________________________________________________ 5 CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 100pF RC 1M RD 1500Ω HIGH- VOLTAGE DC SOURCE DEVICE UNDER TEST Figure 2a. 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 2b. Human Body Model Current Waveform CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 150pF RC 50M to 100M RD 330Ω HIGH- VOLTAGE DC SOURCE DEVICE UNDER TEST Figure 3a. IEC1000-4-2 ESD Test Model tr = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% I Figure 3b. IEC1000-4-2 ESD Generator Current Waveform |
Similar Part No. - MAX1488 |
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Similar Description - MAX1488 |
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