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Max232 Type Rs232 Chips - What Type Of Capacitors, MAX232 Charge pump capacitors

Discussion in 'General Electronics Discussion' started by dxpwny, May 10, 2014.

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  1. dxpwny

    dxpwny

    30
    0
    Jul 9, 2011
    I am building a project using a type of RS232 level translator that runs on just +5 Vdc.
    The actual part is a Sipex/Exar SP207HCP, but I guess my question would apply to any similar IC that use charge pumps to build up the RS232 level voltages.

    My Question is, must I used polarized capacitors as the charge pump capacitors ?

    I have non-polarized caps that would fit much better and would prefer to use them.

    I'm only going to running at 112K Baud and below - though likely no greater then 56k.
     
  2. davenn

    davenn Moderator

    13,662
    1,888
    Sep 5, 2009
    hi there

    google the datasheet, it has all the info you need :)

    Dave
     
  3. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,270
    Nov 28, 2011
    No, you don't need to use polarised capacitors. It's just that the suggested capacitance values may be easier (and cheaper) to obtain in polarised types (e.g. tantalum, or aluminium electrolytic).

    As long as the capacitors you have are the right value, and your circuit won't be operating at extreme temperatures (ceramic caps can lose quite a lot of capacitance at low temperatures), you'll be OK with non-polarised caps.
     
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