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MAX204CPE Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX204CPE Datasheet(HTML) 5 Page - Maxim Integrated Products |
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5 / 23 page  +5V, RS-232 Transceivers with 0.1µF External Capacitors 5 Detailed Description The MAX200–MAX209/MAX211/MAX213 consist of three sections: charge-pump voltage converters, drivers (transmitters), and receivers. Each section is described in detail. +5V to ±10V Dual Charge-Pump Voltage Converter The +5V to Q10V conversion is performed by two charge-pump voltage converters (Figure 4). The first uses capacitor C1 to double +5V to +10V, storing +10V on the V+ output filter capacitor, C3. The second charge- pump voltage converter uses capacitor C2 to invert +10V to -10V, storing -10V on the V- output filter capacitor, C4. The MAX201 and MAX209 include only the V+ to V- charge pump, and are intended for applications that have a VCC = +5V supply and a V+ supply in the +9V to +13.2V range. In shutdown mode, V+ is internally connected to VCC by a 1kI pulldown resistor and V- is internally connected to ground by a 1kI pullup resistor. RS-232 Drivers When VCC = +5V, the typical driver output-voltage swing is Q8V when loaded with a nominal 5kI RS-232 receiver. The output swing is guaranteed to meet the EIA/TIA-232E and V.28 specifications, which call for Q5V minimum out- put levels under worst-case conditions. These include a minimum 3kI load, VCC = +4.5V, and the maximum operating temperature. The open-circuit output-voltage swing ranges from (V+ - 0.6V) to V-. Input thresholds are both CMOS and TTL compatible. The inputs of unused drivers can be left unconnected since 400kI pullup resistors to VCC are included on- chip. Since all drivers invert, the pullup resistors force the outputs of unused drivers low. The input pullup resis- tors typically source 15µA; therefore, the driver inputs should be driven high or open circuited to minimize power-supply current in shutdown mode. When in low-power shutdown mode, the driver outputs are turned off and their leakage current is less than 1mA, even if the transmitter output is backdriven between 0V and (VCC + 6V). Below -0.5V, the transmitter output is diode clamped to ground with a 1kI series impedance. The transmitter output is also zener clamped to approxi- mately (VCC + 6V), with a 1kI series impedance. Figure 1. Shutdown Current Test Circuit Figure 2. Receiver Output Enable and Disable Timing ISHDN +5.5V +5.5V +5.5V (0) +5.5V 0V OR +5.5V DRIVE 0.1FF 0.1FF 0.1FF 0.1FF C1+ C1- C2+ C2- 400kI 3kI 5kI GND VCC V+ V- TIN +5.5V T1 T0 T5 R1 T0 R5 TOUT RIN 0.1FF SHDN ROUT (SHDN) EN (EN) MAX200 MAX205 MAX206 MAX211 MAX213 NOTE 1: ( ) ARE FOR MAX213. NOTE 2: CAPACITORS CAN BE POLARIZED OR UNPOLARIZED. +3.5V RECEIVER OUTPUT CL = 150pF +0.8V VOH - 0.1V + 2.5V VOH VOL RL = 1kI VOL + 0.1V OUTPUT ENABLE TIME RECEIVER OUTPUTS +3V 0V EN INPUT OUTPUT ENABLE TIME +3V 0V EN INPUT NOTE: POLARITY OF EN IS REVERSED FOR THE MAX213. |
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