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Has anyone tried the Dallas Semiconductor DS275 Transceiver in place of a
MAX232? Seems simpler to use and needs no support capacitors. Whats your experience; liked it - hated it? Any enlightenment will be appreciated. TIA Vic ________________________________________________________ Victor Fraenckel - The Windman victorf ATSIGN windreader DOTcom KC2GUI Home of the WindReader Electronic Theodolite Read the WIND "Victory at all costs, victory in spite of all terror, victory however long and hard the road may be; for without victory there is no survival." - Winston [Leonard Spencer] Churchill (1874 - 1965) "Dost thou not know, my son, with how little wisdom the world is governed?" -Count Oxenstierna (ca 1620) to the young King Gustavus Adolphus "People sleep peacefully in their beds at night only because rough men stand ready to do violence on their behalf." -George Orwell |
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Dallas Semi DS275
Started by ●January 11, 2005
Reply by ●January 11, 20052005-01-11
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I use the MAX233 (not MAX232) and similar devices all the time. The 233 doesn't need external capacitors, either. The MAX3233 is also useful for 3.3V systems and the MAX3235 for 5V systems. I haven't used the Dallas variant. --- In , "Vic Fraenckel" <victorf@w...> wrote: > Has anyone tried the Dallas Semiconductor DS275 Transceiver in place of a > MAX232? Seems simpler to use and needs no support capacitors. Whats your > experience; liked it - hated it? > > Any enlightenment will be appreciated. > > TIA > > Vic > ________________________________________________________ > > Victor Fraenckel - The Windman > victorf ATSIGN windreader DOTcom > KC2GUI > > Home of the WindReader Electronic Theodolite > Read the WIND > > "Victory at all costs, victory in spite of all terror, victory however long > and hard the road may be; for without victory there is no survival." > - Winston [Leonard Spencer] Churchill (1874 - 1965) > > "Dost thou not know, my son, with how little wisdom the world is governed?" > -Count Oxenstierna (ca 1620) to the young King Gustavus Adolphus > > "People sleep peacefully in their beds at night only because rough > men stand ready to do violence on their behalf." > -George Orwell |
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Reply by ●January 11, 20052005-01-11
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At 04:49 AM 1/11/2005, Vic Fraenckel wrote: >Has anyone tried the Dallas Semiconductor DS275 Transceiver in place of a >MAX232? Seems simpler to use and needs no support capacitors. Whats your >experience; liked it - hated it? The main problem with the ds275 is that it derives its negative supply from the incoming serial signal. In other words, it is just an IC version of the simple 1 transistor + diode + cap + resistors serial TX driver circuit seen in so many projects. That means that it suffers the same problems. It will work just fine so long as the device you are connecting to contains a real RS232 port. It won't work if the device you are connecting to uses a similar driver circuit. dwayne -- Dwayne Reid <> Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 20 years of Engineering Innovation (1984 - 2004) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. |
Reply by ●January 11, 20052005-01-11
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Dwayne, Thanks for the info. I'll go with the MAX2xx instead. Regards, Vic ________________________________________________________ Victor Fraenckel - The Windman victorf ATSIGN windreader DOTcom KC2GUI Home of the WindReader Electronic Theodolite Read the WIND "Victory at all costs, victory in spite of all terror, victory however long and hard the road may be; for without victory there is no survival." - Winston [Leonard Spencer] Churchill (1874 - 1965) "Dost thou not know, my son, with how little wisdom the world is governed?" -Count Oxenstierna (ca 1620) to the young King Gustavus Adolphus "People sleep peacefully in their beds at night only because rough men stand ready to do violence on their behalf." -George Orwell |
Reply by ●January 11, 20052005-01-11
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The DS275 is a clever hack that works 99.9% of the time (a made-up
number), but if you really need to meet the letter of the RS232
specification, you need to go with a REAL RS232 device. As it happens, I
designed all three of the devices (with internal capacitors) you
mentioned at Maxim, so I may have a bias on the topic; but since Dallas
is now part of Maxim, I don't care which device you use. Bob Underwood Maxim Design At 08:03 AM 1/11/2005, you wrote: I use the MAX233 (not MAX232) and similar devices all the time. The |
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