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MAX203ECWP Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX203ECWP Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 25 page _______________________________________________________________________________________ 9 ±15kV ESD-Protected, +5V RS-232 Transceivers V+ MAX2_ _E 0.1 µF* VCC 0.1 µF* T_ R_ 0.1 µF* C1+ C1- C2+ C2- VCC T_OUT R_OUT EN (EN) SHDN (SHDN) 400k Ω 5k Ω 0.1 µF* 0.1 µF* 3k Ω +5V R_IN T_IN MINIMUM SLEW-RATE TEST CIRCUIT 0V (+5V) 0V (+5V) 2500pF V- V+ 0.1 µF* VCC 0.1 µF* R_ T_ 0.1 µF* C1+ C1- C2+ C2- VCC T_OUT R_OUT EN (EN) SHDN (SHDN) 400k Ω 5k Ω 0.1 µF* 0.1 µF* 7k Ω +5V R_IN T_IN MAXIMUM SLEW-RATE TEST CIRCUIT 0V (+5V) 0V (+5V) 50pF V- ( ) ARE FOR MAX213E * 1 µF FOR MAX232E/MAX241E MAX2_ _E TRANSMITTER INPUT PULL-UP RESISTORS, ENABLE, AND SHUTDOWN ARE NOT PROVIDED ON THE MAX202E, MAX203E, AND MAX232E. ENABLE AND SHUTDOWN ARE NOT PROVIDED ON THE MAX207E AND MAX208E. Figure 3. Transition Slew-Rate Circuit _______________Detailed Description The MAX202E–MAX213E, MAX232E/MAX241E consist of three sections: charge-pump voltage converters, drivers (transmitters), and receivers. These E versions provide extra protection against ESD. They survive ±15kV discharges to the RS-232 inputs and outputs, tested using the Human Body Model. When tested according to IEC1000-4-2, they survive ±8kV contact- discharges and ±15kV air-gap discharges. The rugged E versions are intended for use in harsh environments or applications where the RS-232 connection is frequently changed (such as notebook computers). The standard (non-“E”) MAX202, MAX203, MAX205– MAX208, MAX211, MAX213, MAX232, and MAX241 are recommended for applications where cost is critical. +5V to ±10V Dual Charge-Pump Voltage Converter The +5V to ±10V conversion is performed by dual charge-pump voltage converters (Figure 4). The first charge-pump converter uses capacitor C1 to double the +5V into +10V, storing the +10V on the output filter capacitor, C3. The second uses C2 to invert the +10V into -10V, storing the -10V on the V- output filter capacitor, C4. In shutdown mode, V+ is internally connected to VCC by a 1k Ω pull-down resistor, and V- is internally connected to ground by a 1k Ω pull up resistor. RS-232 Drivers With VCC = 5V, the typical driver output voltage swing is ±8V when loaded with a nominal 5k Ω RS-232 receiver. The output swing is guaranteed to meet EIA/TIA-232E and V.28 specifications that call for ±5V minimum output levels under worst-case conditions. These include a 3k Ω load, minimum VCC, and maximum operating temperature. The open-circuit output voltage swings from (V+ - 0.6V) to V-. Input thresholds are CMOS/TTL compatible. The unused drivers’ inputs on the MAX205E–MAX208E, MAX211E, MAX213E, and MAX241E can be left unconnected because 400k Ω pull up resistors to VCC are included on-chip. Since all drivers invert, the pull up resistors force the unused drivers’ outputs low. The MAX202E, MAX203E, and MAX232E do not have pull up resistors on the transmitter inputs. |
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