Lpc2000

Thanks to everybody. 
First of all I asked for this alternative circuit for a few reasons. 
My Local Supplier and Sales representative of Maxim, sells Maxim 
chips 3 times what Maxim sells it. So a MAX3237 is nearly 10 dolars. 
Maxim doesn't want to send sample chips directly, and want me to ask 
sample to my sales representative...of course somebody that sells a 
chips 10 dolars, will never give you a free sample (at least here in 
Argentina). And it's very expensive to buy one or two chips from 
USA. It's something reasonable if you buy in quantity, but I only 
need two or perhaps three MAX3232CPE or something similar, to test 
my board and play with it.
Leon, could you send me the transistor interfase for RS232 at 3V?
Also I will look at my MAX232CPE datasheet, and look if the chips 
accepts a 3.3V as a High TTL Level.
Thanks to everybody
Ezequiel Aceto

--- In lpc2000@yahoogroups.com, "J.C. Wren" <jcwren@j...> wrote:
>     I may have missed this if anyone mentioned it before, but if 
you're 
> building that aren't going to be shipped to end users, a MAX232 
runs 
> fine at 3.3V.  You get +-6.6V out of the charge pump, instead of +-
10V, 
> but 6.6V is well within the RS-232 spec.  I used Sipex and Maxim 
parts 
> all the time in this configuration for prototyping, or whipping up 
a 
> quick RS232 interface to a logic level device.
> 
>     I know there was more in this thread, but my mail server 
swallowed 
> it, so I apologize if this idea has already been mentioned.
> 
>     --jc
> 
> Robert Adsett wrote:
> 
> > At 10:45 AM 12/11/04 +0000, you wrote:
> > >Unfortunately I cannot obtain any RS232 Driver for 3.3V, yes 
for 5V.
> > >In My LPC board I have 5V, so I was thinking about adding some
> > >transistor and convert the 3.3V from the LPC2106 to 5V and 
viceversa
> > >for the RX pin. I know this is not the best solution, but I 
think it
> > >could work. If not, what about making a Level shifter with
> > >Transistors? Does anybody have a schematic, or can help me with 
this?
> >
> > In addition to all the pointers to 3V level convertors I would 
add;  Why
> > not just use a 5V level convertor since you have the 5V 
available?  
> > Run 5V
> > to you level convertor and then hook it's Rx and Tx lines to the 
> > micro.  If
> > your level convertor is TTL compatible then it's inputs should 
match the
> > drive output.  Check the VIH rating of your convertor.
> >
> >
> > Robert
> >
> > " 'Freedom' has no meaning of itself.  There are always 
restrictions,
> > be they legal, genetic, or physical.  If you don't believe me, 
try to
> > chew a radio signal. "
> >
> >                          Kelvin Throop, III