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MAX202IDW Datasheet(PDF) 7 Page - Texas Instruments |
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MAX202IDW Datasheet(HTML) 7 Page - Texas Instruments |
7 / 20 page www.ti.com APPLICATION INFORMATION 11 10 8 1 2 3 4 7 ROUT2 DIN2 9 RIN1 16 13 12 15 14 DIN1 5 6 + – V CC C2+ C1+ GND C1– ROUT1 C2– + – CBYPASS =0.1 F, m V+ + – + – RIN2 + – DOUT1 DOUT2 † C3canbeconnectedtoV orGND. CC NOTES: A .Resistorvaluesshownarenominal. V– C1 0.1 F, m 6.3V C3 † 0.1 F m 16V C2 0.1 F, m 16V 5kW 5kW C4 0.1 F m , 16V B.Nonpolarizedceramiccapacitorsareacceptable.Ifpolarizedtantalumorelectrolyticcapacitorsareused,theyshouldbe connectedasshown. Capacitor Selection ESD Protection MAX202 5-V DUAL RS-232 LINE DRIVER/RECEIVER WITH ±15-kV ESD PROTECTION SLLS576E – JULY 2003 – REVISED APRIL 2007 Figure 4. Typical Operating Circuit and Capacitor Values The capacitor type used for C1–C4 is not critical for proper operation. The MAX202 requires 0.1- µF capacitors, although capacitors up to 10 µF can be used without harm. Ceramic dielectrics are suggested for the 0.1-µF capacitors. When using the minimum recommended capacitor values, make sure the capacitance value does not degrade excessively as the operating temperature varies. If in doubt, use capacitors with a larger (e.g., 2 ×) nominal value. The capacitors' effective series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V–. Use larger capacitors (up to 10 µF) to reduce the output impedance at V+ and V–. Bypass VCC to ground with at least 0.1 µF. In applications sensitive to power-supply noise generated by the charge pumps, decouple VCC to ground with a capacitor the same size as (or larger than) the charge-pump capacitors (C1–C4). TI MAX202 devices have standard ESD protection structures incorporated on the pins to protect against electrostatic discharges encountered during assembly and handling. In addition, the RS232 bus pins (driver outputs and receiver inputs) of these devices have an extra level of ESD protection. Advanced ESD structures were designed to successfully protect these bus pins against ESD discharge of ±15-kV when powered down. 7 Submit Documentation Feedback |
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