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The input to the max232 ic will be of Transistor Transistor Logic (TTL) and its voltage range will be of 5 volt. The output of the max 232 ic will be of Recomended Standard 232 Logic (RS232 logic) and its voltage range will be of 12 volt. The max 232 ic which is operating on 5 volt supply has to step up the 5 volt input to 12 volt. Hence a capacitor is used for pumping the voltage and called as pumping capacitor.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoThe Voltage difference between rs232 and ttl logic demands a need to pump up charge when converting ttl to rs232 levels. for this pumping up operation external capacitors are required. also one of the capacitors is used for level inversion from +15V to -15V
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