MAX3232 and MAX232
2004-11-07 by acetoel
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
Thread
MAX3232 and MAX232
Re: [lpc2000] MAX3232 and MAX232
2004-11-07 by Micron Engineering
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.
RE: [lpc2000] MAX3232 and MAX232
2004-11-07 by Leon Heller
>From: "acetoel" <acetoel@...> >Reply-To: lpc2000@yahoogroups.com >To: lpc2000@yahoogroups.com >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
Re: [lpc2000] MAX3232 and MAX232
2004-11-07 by Robert Wood
>> 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.
Re: [lpc2000] MAX3232 and MAX232
2004-11-07 by Micron Engineering
Leon Heller wrote: > > >>From: "acetoel" <acetoel@...> >>Reply-To: lpc2000@yahoogroups.com >>To: lpc2000@yahoogroups.com >>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. [Non-text portions of this message have been removed]
RE: [lpc2000] MAX3232 and MAX232
2004-11-07 by Dan Beadle
Take a look at TI cross. They are much cheaper, widely available. _____
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From: Micron Engineering [mailto:micronpn@...] Sent: Sunday, November 07, 2004 9:18 AM To: lpc2000@yahoogroups.com Subject: Re: [lpc2000] MAX3232 and MAX232 Leon Heller wrote: > > >>From: "acetoel" <acetoel@...> >>Reply-To: lpc2000@yahoogroups.com >>To: lpc2000@yahoogroups.com >>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. [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT <http://us.ard.yahoo.com/SIG=129n8uif2/M=295196.4901138.6071305.3001176/D=gr oups/S=1706554205:HM/EXP=1099934156/A=2128215/R=0/SIG=10se96mf6/*http:/compa nion.yahoo.com> click here <http://us.adserver.yahoo.com/l?M=295196.4901138.6071305.3001176/D=groups/S= :HM/A=2128215/rand=704218465> _____ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/lpc2000/ * To unsubscribe from this group, send an email to: lpc2000-unsubscribe@yahoogroups.com <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> * Your use of Yahoo! Groups is subject to the Yahoo! <http://docs.yahoo.com/info/terms/> Terms of Service. [Non-text portions of this message have been removed]
Re: [lpc2000] MAX3232 and MAX232
2004-11-08 by Paul Stoffregen
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. >
Re: MAX3232 and MAX232
2004-11-08 by acetoel
--- In lpc2000@yahoogroups.com, 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
Re: [lpc2000] MAX3232 and MAX232
2004-11-09 by Robert Adsett
At 08:01 AM 11/8/04 -0800, you 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.
> >
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, IIIRE: [lpc2000] Re: MAX3232 and MAX232
2004-11-09 by Dan Beadle
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. _____
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From: acetoel [mailto:acetoel@...] Sent: Monday, November 08, 2004 3:14 PM To: lpc2000@yahoogroups.com Subject: [lpc2000] Re: MAX3232 and MAX232 --- In lpc2000@yahoogroups.com, 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 Yahoo! Groups Sponsor ADVERTISEMENT <http://us.ard.yahoo.com/SIG=1299cn9a3/M=294855.5468653.6549235.3001176/D=gr oups/S=1706554205:HM/EXP=1100042121/A=2376776/R=0/SIG=11ldm1jvc/*http:/promo tions.yahoo.com/ydomains2004/index.html> click here <http://us.adserver.yahoo.com/l?M=294855.5468653.6549235.3001176/D=groups/S= :HM/A=2376776/rand=693868521> _____ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/lpc2000/ * To unsubscribe from this group, send an email to: lpc2000-unsubscribe@yahoogroups.com <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> * Your use of Yahoo! Groups is subject to the Yahoo! <http://docs.yahoo.com/info/terms/> Terms of Service. [Non-text portions of this message have been removed]