The middle one is wrong.

I think the top capacitor (positive to +vs) can have it's negative end taken
to either supply. Taking it to GND puts the device under more strain on
power-up though.

Oliver.

----- Original Message -----
From: "Rick Regan" <rdrdr2k@YAHOO.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: 05 April 2003 00:07
Subject: [EE]: Correct way to hook up MAX232 VS+/VS- pins


> I'm trying to figure out the correct way to hook up
> pin 2 (VS+) and pin 6 (VS-) of a MAX232.  I've looked
> at around 20 or more schematics I found on the web,
> and there seems to be many ways to do it.  I saw
> several permutations of capacitor polarity and
> whether the pins are hooked up to Vdd or GND.
>
> The most popular way seems to be:
>
>   VS+ ---|+  -|---- GND
>   VS- ---|-  +|---- GND
>
> But I've seen:
>
>   VS+ ---|-  +|---- 5V
>   VS- ---|+  -|---- GND
>
> and
>
>   VS+ ---|+  -|---- 5V
>   VS- ---|-  +|---- GND
>
>
> So I guess there's no one right way to do it??
> I suppose if I knew what these pins really did I
> could answer the question myself.
>
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