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MAX3241EEUI Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3241EEUI Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 22 page ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers ______________________________________________________________________________________ 11 For the MAX3237E, all logic and RS-232 I/O pins are characterized for protection to ±15kV per the Human Body Model. 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 4a shows the Human Body Model, and Figure 4b 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 interest, 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 performance of finished equipment; it does not specifi- cally refer to integrated circuits. The MAX3222E/ MAX3232E/MAX3237E/MAX3241E/MAX3246E help you design 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 higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with- stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 5a shows the IEC 1000-4-2 model, and Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 level 4 ESD Contact Discharge test. 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, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports. Table 2. Required Minimum Capacitor Values -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 0 123456789 10 LOAD CURRENT PER TRANSMITTER (mA) VOUT+ VOUT- VOUT+ VOUT- VCC VCC = 3.0V Figure 6a. MAX3241E Transmitter Output Voltage vs. Load Current Per Transmitter Table 3. Logic-Family Compatibility with Various Supply Voltages VCC (V) C1 (µF) C2, C3, C4 (µF) MAX3222E/MAX3232E/MAX3241E 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.1 0.47 MAX3237E/MAX3246E 3.0 to 3.6 0.22 0.22 3.15 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1.0 SYSTEM POWER-SUPPLY VOLTAGE (V) VCC SUPPLY VOLTAGE (V) COMPATIBILITY 3.3 3.3 Compatible with all CMOS families 55 Compatible with all TTL and CMOS families 5 3.3 Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS |
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