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MAX3233ECWP Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX3233ECWP Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page ±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors _______________________________________________________________________________________ 9 event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits: 1) ±15kV using the Human Body Model 2) ±8kV using the Contact Discharge method specified in IEC 1000-4-2 3) ±15kV using IEC 1000-4-2’s Air-Gap Discharge method ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. Human Body Model Figure 5a shows the Human Body Model and Figure 5b shows the current waveform it generates when dis- charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of inter- est, which is then discharged into the test device through a 1.5k Ω resistor. IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and per- formance of finished equipment; it does not specifically refer to integrated circuits. The MAX3233E/MAX3235E help you design equipment that meets Level 4 (the high- est level) 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 higher peak cur- rent 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 FORCEON MASTER SHDN LINE 0.1µF 1M FORCEOFF MAX3233E MAX3235E POWER- MANAGEMENT UNIT Figure 4. AutoShutdown Plus Initial Turn-On to Wake Up Another System IP 100% 90% 36.8% tRL TIME tDL CURRENT WAVEFORM PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) Ir 10% 0 0 AMPERES Figure 5b. Human Body Current Waveform CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 100pF RC 1M RD 1500Ω HIGH- VOLTAGE DC SOURCE DEVICE UNDER TEST Figure 5a. Human Body ESD Test Model Figure 6a. IEC 1000-4-2 ESD Test Model CHARGE CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 150pF RC 50M to 100M RD 330Ω HIGH- VOLTAGE DC SOURCE DEVICE UNDER TEST |
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