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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 |
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MAX3232 and MAX232
Started by ●November 7, 2004
Reply by ●November 7, 20042004-11-07
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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 ●November 7, 20042004-11-07
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>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 |
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Reply by ●November 7, 20042004-11-07
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>> 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 ●November 7, 20042004-11-07
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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. |
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Reply by ●November 7, 20042004-11-07
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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. |
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Reply by ●November 8, 20042004-11-08
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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. > |
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Reply by ●November 8, 20042004-11-08
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--- 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 |
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Reply by ●November 8, 20042004-11-08
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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, III |
Reply by ●November 9, 20042004-11-09
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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.... Thanks Ezequiel <http://us.ard.yahoo.com/SIG99cn9a3/M)4855.5468653.6549235.3001176/D=gr oups/S06554205:HM/EXP00042121/A#76776/R=0/SIGldm1jvc/*http:/promo tions.yahoo.com/ydomains2004/index.html> click here <http://us.adserver.yahoo.com/l?M)4855.5468653.6549235.3001176/D=groups/S= :HM/A#76776/randi3868521 _____ > Terms of Service. |
