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MAX3230EEBV-T Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX3230EEBV-T Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page ±15kV ESD-Protected +2.5V to +5.5V RS-232 Transceivers in UCSP _______________________________________________________________________________________ 9 which is then discharged into the test device through a 1.5kΩ 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 ICs. The MAX3230E/MAX3231E aid in designing equipment that meets Level 4 (the highest 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 a higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with- stands voltage measured to IEC 1000-4-2 and is gener- ally lower than that measured using the Human Body Model. Figure 6a shows the IEC 1000-4-2 model, and Figure 6b shows the current waveform for the ±8kV IEC 1000-4-2 Level 4 ESD Contact Discharge test. The Air-Gap 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 resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufactur- ing. Of course, all pins require this protection during manufacturing, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports. Applications Information Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation; either polarized or nonpolarized capacitors can be used. However, ceramic chip capaci- tors with an X7R or X5R dielectric work best. The charge pump requires 0.1µF capacitors for 3.3V operation. For other supply voltages, see Table 3 for required capaci- tor values. Do not use values smaller than those listed in Table 3. Increasing the capacitor values (e.g., by a fac- tor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing the vaue of C1. Caution: Do not increase C1 without also increasing the values of C2, C3, and C4 to maintain the proper ratios (C1 to the other capacitors). When using the minimum required capacitor values, make sure the capacitor value does not degrade exces- sively with temperature. If in doubt, use capacitors with Figure 3. AutoShutdown Trip Levels V- VCC 0 V+ 0 VCC tINVL tWU INVALID REGION RECEIVER INPUT VOLTAGE (V) INVALID OUTPUT (V) tINVH TRANSMITTERS ENABLED, INVALID HIGH AutoShutdown, TRANSMITTERS DISABLED, 1µA SUPPLY CURRENT, INVALID LOW TRANSMITTERS ENABLED, INVALID HIGH a) b) -2.7V -0.3V +2.7V +0.3V 0 INDETERMINATE INDETERMINATE Figure 4. AutoShutdown with Initial Turn-On to Wake Up a Mouse or Another System FORCEON MASTER SHDN LINE 0.1µF1MΩ FORCEOFF MAX3230E MAX3231E POWER- MANAGEMENT UNIT |
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