外文翻譯---max232-5v的供電，多通道rs-232接口驅(qū)動(dòng)器接收器-文庫吧資料
2025-01-23 23:34本頁面
【正文】 ins less than 1μA, even if the transmitter output is backdriven between 0V and (VCC + 6V). Below , the transmitter is diode clamped to ground with 1kΩ series impedance. The transmitter is also zener clamped to approximately VCC + 6V, with a series impedance of 1kΩ. The driver output slew rate is limited to less than 30V/μs as required by the EIA/TIA232E and specifications. Typical slew rates are 24V/μs unloaded and 10V/μs loaded with 3Ω and 2500pF.RS232 ReceiversEIA/TIA232E and specifications define a voltage level greater than 3V as a logic 0, so all receivers invert. Input thresholds are set at and , so receiversrespond to TTL level inputs as well as EIA/TIA232E and levels. The receiver inputs withstand an input overvoltage up to 177。8V when loaded with a nominal 5kΩ RS232 receiver and VCC =+5V. Output swing is guaranteed to meet the EIA/TIA232E and specification, which calls for 177。10V (unloaded) for RS232 driver operation. The first converter uses capacitor C1 to double the +5V input to +10V on C3 at the V+ output. The second converter uses capacitor C2 to invert +10V to 10V on C4 at the V output.A small amount of power may be drawn from the +10V (V+) and 10V (V) outputs to power external circuitry (see the Typical Operating Characteristics section), except on the MAX225 and MAX245–MAX247, where these pins are not available. V+ and V are not regulated, so the output voltage drops with increasing load current. Do not load V+ and V to a point that violates the minimum 177。附錄AMAX2325VPowered,Multichannel RS232 Drivers/Receivers The MAX232 is a dual driver/receiver that includes a capacitive voltage generator to supply TIA/EIA232F voltage levels from a single 5V supply. Each receiver converts TIA/EIA232F inputs to 5V TTL/CMOS levels. These receivers have a typical threshold of V, a typical hysteresis of V, and can accept 177。30V inputs. Each driver converts TTL/CMOS input levels into TIA/EIA232F levels. The driver, receiver, and voltagegenerator functions are available as cells in the Texas Instruments LinASIC MAX220–MAX249 contain four sections: dual chargepump DCDC voltage converters, RS232 drivers,RS232 receivers, and receiver and transmitter enable control inputs.Dual ChargePump Voltage ConverterTh
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