cctalk Digest, Vol 70, Issue 3

Patrick Finnegan pat at
Wed Jun 3 13:11:51 CDT 2009

On Wednesday 03 June 2009, Chuck Guzis wrote:
> On 3 Jun 2009 at 12:10, Dave McGuire wrote:
> >    The MAX232, if memory serves, is specced at 10V but usually tops
> > out at 8-9V in my experience.  I sure do love those chips. :)
> I get about +/-10 out of the MAX232Ns from TI, but I use 10 uF/25v
> caps instead of 1uF on them (just have more of them in my hellbox).
> There are also the cap-less models from Maxim (can't recall the part
> numbers) that are pretty tempting.
> Some modern equipment gives you +5/0 for "RS232" levels.  My DTV set-
> top-box with a DE9 on the rear panel  labeld "RS232" is such an
> example.
> Although, I suppose we're going to have to start calling it "TIA-
> 232".

I've used the MAX 3233E recently, and it seemed to do what I wanted 
(allow me to hook a serial console up to a device with a 3.3V port), 
and I've used the 5V version (3235) before as well.

It's nice having a 1-chip design for an RS-232 level converter.

Purdue University Research Computing ---
The Computer Refuge                  ---

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