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MAX3233ECWP-TG36 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3233ECWP-TG36 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page 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 resis- tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. Of course, all pins require this protec- tion 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 Charge Pumps The MAX3233E/MAX3235E do not require external capacitors to operate their internal charge pumps. The MAX3235E can be operated down to 3.0V by par- alleling the internal C1 capacitor with an external 0.1µF. When using an external capacitor across the C1 termi- nals, check to confirm that the total supply voltage measured from V+ to V- does not exceed the absolute maximum voltage of 13V. With the external 0.1µF capacitor added, the MAX3235E should not be used with a supply greater than +3.9V. Power-Supply Decoupling In most applications, a 0.1µF VCC bypass capacitor is adequate. Connect bypass capacitors as close to the IC as possible. Transmitter Outputs when Exiting Shutdown Figure 7 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans- mitter outputs are shown going to opposite RS-232 levels (one transmitter input is high, the other is low). ±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors 10 ______________________________________________________________________________________ tr = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% I Figure 6b. IEC 1000-4-2 ESD Generator Current Waveform 10 µs/div T1OUT T2OUT 5V/div 0 2V/div 0 10V/div 0 VCC = 3.3V FORCEON = FORCEOFF Figure 7. Transmitter Outputs when Exiting Shutdown or Powering Up MAX3233E MAX3235E 5k Ω R_ IN R_ OUT FORCEON VCC CBYPASS VCC FORCEOFF T_ OUT T_ IN GND VCC 1000pF Figure 8. Loopback Test Circuit |
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