Olin Lathrop wrote:
> If you have a larger than 1uF ceramic cap you can use that instead.
> Anything ceramic of 1uF of higher should be good enough as the power 
> supply
> cap for a MAX232 chip.  Do not substitute electrolytic though.  These 
> don't
> have the frequency response to work in this situation.

Olin, you haven't read the datasheet yourself, have you? It says nothing 
about not using electrolytics.


alan smith wrote:
> For one thing...if an app note says..use a low ESR 1uF cap across these 
> pins, its a pretty safe bet that you need to,

It says nothing about "low ESR", either. Any cap will do.

You guys seem to forget that these are level shifter circuits, not 
microcontrollers. The cap is there simply to keep the voltage on RS232 from 
going too far below 10V, for the duration of the bit.

Vitaliy 

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