TI makes a 3V part. I have some good success with it - about $1. Uses .1
or
1uf chip caps, which are cheap. Available from Digikey.
_____
From: acetoel [mailto:]
Sent: Monday, November 08, 2004 3:14 PM
To:
Subject: [lpc2000] Re: MAX3232 and MAX232
--- In , Paul Stoffregen <Paul@P...> wrote: > I tried once to use the TI MAX232 at a lower
voltage, and it did not > work under approx 4 volts.
>
> > Take a look at TI cross. They are much cheaper, widely available.
> >
Hello... I cannot find any supplier in argentina for this MAX
version. In fact, I think I'm the only LPC user in
Argentina...jajaja... Well, I'll se....perhaps I'll make a Level
shifter with transistors....
>I tried once to use the TI MAX232 at a lower
voltage, and it did not
>work under approx 4 volts.
>
> > Take a look at TI cross. They are much cheaper, widely available.
> >
On the other hand the TI MAX3238 is rated to 3.3 V and is in my experience
both cheaper and more readily available.
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
Reply by acetoel●November 8, 20042004-11-08
--- In , Paul Stoffregen <Paul@P...> wrote: > I tried once to use the TI MAX232 at a lower
voltage, and it did not > work under approx 4 volts.
>
> > Take a look at TI cross. They are much cheaper, widely available.
> >
Hello... I cannot find any supplier in argentina for this MAX
version. In fact, I think I'm the only LPC user in
Argentina...jajaja... Well, I'll se....perhaps I'll make a Level
shifter with transistors....
Thanks
Ezequiel
Reply by Paul Stoffregen●November 8, 20042004-11-08
I tried once to use the TI MAX232 at a lower voltage, and it did not
work under approx 4 volts.
> Take a look at TI cross. They are much cheaper,
widely available.
>
Reply by Dan Beadle●November 7, 20042004-11-07
Take a look at TI cross. They are much cheaper, widely available.
_____
From: Micron Engineering [mailto:]
Sent: Sunday, November 07, 2004 9:18 AM
To:
Subject: Re: [lpc2000] MAX3232 and MAX232
Leon Heller wrote:
>
>
>>From: "acetoel" <>
>>Reply-To:
>>To:
>>Subject: [lpc2000] MAX3232 and MAX232
>>Date: Sun, 07 Nov 2004 16:50:26 -0000
>>
>>
>>
>>Hello...
>>I'm makign my own board for LPC. May I used a Max232 instead of
the
>>MAX3232 that everybody use? I'm taking in consideration that LPC
>>I/O's are 5V tolerant...
>>
>
>I've had a MAX202 working OK at 3.3V, so a MAX232 will probably be OK.
The
>MAX3232 would be best, if you can get one, as it will be within its spec.
>
>Leon
>
>> Terms of Service.
Reply by Micron Engineering●November 7, 20042004-11-07
Leon Heller wrote:
>
>
>>From: "acetoel" <>
>>Reply-To:
>>To:
>>Subject: [lpc2000] MAX3232 and MAX232
>>Date: Sun, 07 Nov 2004 16:50:26 -0000
>>
>>
>>
>>Hello...
>>I'm makign my own board for LPC. May I used a Max232 instead of
the
>>MAX3232 that everybody use? I'm taking in consideration that LPC
>>I/O's are 5V tolerant...
>>
>
>I've had a MAX202 working OK at 3.3V, so a MAX232 will probably be OK.
The
>MAX3232 would be best, if you can get one, as it will be within its spec.
>
>Leon
>
>Yahoo! Groups Links
>
> MAX232 and MAX202 may work but RS232 voltage levels (and currents)
aren't guaranteed so it is not design a board using MAX202 and MAX232 to
work at a nominal level under +5V. You have to read carefully datasheet
and see output voltage swing in function of Vcc and you may see that may
drop down to 4.5V that is a very bad value.
Reply by Robert Wood●November 7, 20042004-11-07
>> I've had a MAX202 working OK at 3.3V, so a MAX232 will
probably be OK. The
MAX3232 would be best, if you can get one, as it will be within its spec.
<<
Also, the 3V parts aren't difficult to get hold of (at least not in the UK)
and there are quite a few people making drop in equivalents. Intersil and ST
do them to name two off the top of my head. Unless you have a big stash of 5V
parts you need to use up, you really would be best off using the 3V part.
Reply by Micron Engineering●November 7, 20042004-11-07
acetoel wrote:
>Hello...
>I'm makign my own board for LPC. May I used a Max232 instead of the
>MAX3232 that everybody use? I'm taking in consideration that LPC
>I/O's are 5V tolerant...
>Thanks
>Ezequiel
>
>
>Yahoo! Groups Links
>
> Yes you can but this means that you need also a +5V power supply. My
idea is to have only one supply for cpu, memory and i/o because LPC i/o
is +5V tolerant, I may use this scheme.
Reply by Leon Heller●November 7, 20042004-11-07
>From: "acetoel" <>
>Reply-To:
>To:
>Subject: [lpc2000] MAX3232 and MAX232
>Date: Sun, 07 Nov 2004 16:50:26 -0000
>
>Hello...
>I'm makign my own board for LPC. May I used a Max232 instead of the
>MAX3232 that everybody use? I'm taking in consideration that LPC
>I/O's are 5V tolerant...
I've had a MAX202 working OK at 3.3V, so a MAX232 will probably be OK. The
MAX3232 would be best, if you can get one, as it will be within its spec.
Leon
Reply by acetoel●November 7, 20042004-11-07
Hello...
I'm makign my own board for LPC. May I used a Max232 instead of the
MAX3232 that everybody use? I'm taking in consideration that LPC
I/O's are 5V tolerant...
Thanks
Ezequiel