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MAX3243E: Interface forum

ttd
Mastermind 8800 points
Part Number: MAX3243E


Dear Technical Support,

I have two questions about capacitor for charge pump.

①Datasheet shows 3 situation about capacitor for charge pump.

    When Vcc = 5V, which case is better , "5 V ± 0.5 V" or "3 V to 5.5 V"?

    I'd like to use "3 V to 5.5 V" , because type of capacitor is less than "5 V ± 0.5 V".

  

② When  the capacitor value is based on "3 V to 5.5 V" of ①, is Voh/Vol guaranteed ?

    Note of datasheet shows only  "5 V ± 0.5 V".

   

Best Regards,

ttd

  • 0
    TI__Mastermind 25705 points

    Hi,

    1) For 5V supply, both configurations are OK. "3V to 5.5V" case may generate a little higher ripples than "5 V ± 0.5 V" case. The detail is discussed in this blog.

    2) It's a good observation. Minimum 5V comes from RS-232 standard, therefore MAX3243E should support it under all supply conditions.

    Please let me know if you have more questions.

    Regards,

    Hao