Author: RsKDate: 09:15 19-11-06
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Please tell me what is the main difference between MAX232 and DS275 and
is there any disadvantage of using DS275 or advantages?
regards,
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RsK ha escrito:
> Please tell me what is the main difference between MAX232 and DS275 and
> is there any disadvantage of using DS275 or advantages?
> regards,
It seems that the main advantage is its much lower power consumption
because its takes power from the input lines when these are in their
negative state (negative voltages), whereas a standard 232 IC will
drain a little bit more current from its positive power pin in this
situation. The typical power consumption is like 10 times or more
smaller in a DS275 or DS276 than in a RS232.
There only seems to be the 8-pin package for the DS27x so one
disadvantage is you won=B4t have multichannel ICs or an industrial
temperature range, at least for the moment as you can see on the Maxim
website.
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Author: Jerry AvinsDate: 13:39 19-11-06
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RsK wrote:
> Please tell me what is the main difference between MAX232 and DS275 and
> is there any disadvantage of using DS275 or advantages?
> regards,
Get a hold of the data sheets. They will answer questions you didn't
even think to ask.
Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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Author: =?UTF-8?B?UGFsaW5kcuKYu21l?=Date: 13:57 19-11-06
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Jerry Avins wrote:
> RsK wrote:
>
>> Please tell me what is the main difference between MAX232 and DS275 and
>> is there any disadvantage of using DS275 or advantages?
>> regards,
>
>
> Get a hold of the data sheets. They will answer questions you didn't
> even think to ask.
>
<piggyback>
The MAX232 produces true RS232 signals (with the correct amplitudes).
The DS275 does not, but should work in most applications - it is smaller
and has a lower component count. However, there is a possibility that
the link will not work because the output voltages are not correct for
RS232.
If you have control over what is used at each end of the RS232 link -
the DS275 uses less power, less components and less board space.
If you want the serial link to work with any (unspecified) RS232 device
- then use the MAX232.
--
Sue
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Author: Jon HylandsDate: 14:53 19-11-06
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On Sun, 19 Nov 2006 18:57:26 +0000, Palindr?me <me9@privacy.net> wrote:
> The DS275 does not, but should work in most applications - it is smaller
> and has a lower component count. However, there is a possibility that
> the link will not work because the output voltages are not correct for
> RS232.
The only issue to be aware of with the DS-275 is that your comm speed is
limited to about 19,200 baud...
Later,
Jon
--------------------------------------------------------------
Jon Hylands Jon@huv.com http://www.huv.com/jon
Project: Micro Seeker (Micro Autonomous Underwater Vehicle)
http://www.huv.com
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Author: Robert BaerDate: 19:30 19-11-06
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RsK wrote:
> Please tell me what is the main difference between MAX232 and DS275 and
> is there any disadvantage of using DS275 or advantages?
> regards,
>
Well, Maxim and Dallas ICs only exist in ads...
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Author: Tim AutonDate: 09:33 20-11-06
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In sci.electronics.design RsK <rizkhan7@gmail.com> wrote:
> Please tell me what is the main difference between MAX232 and DS275 and
> is there any disadvantage of using DS275 or advantages?
> regards,
A MAX232 generates is own RS232 signalling levels from +5V. A DS275
'steals' power from the signal lines - it is powered by the RS232
transmitter at the other end of the cable. DS275 are slower, will have
more trouble with very long cables and you can't use one at both ends
of a cable (because they rely on the other end to power them). DS275s
use less power from their host and are smaller, so are nice for
tiny/cheap things which will be attached to a PC.
Tim
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Author: Jim HewittDate: 17:17 20-11-06
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"Tim Auton" <tim.auton@uton.borg.invalid> wrote in message
news:fuq834-dii.ln1@bertha.auton.me.uk...
> DS275s use less power from their host and are smaller, so are nice
> for tiny/cheap things which will be attached to a PC.
But they themselves are not so cheap. MAX232 on other order of $1 each;
DS275 $4 or $5.
And harder to find.
Jim
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Author: Jerry AvinsDate: 20:01 20-11-06
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Jim Hewitt wrote:
> "Tim Auton" <tim.auton@uton.borg.invalid> wrote in message
> news:fuq834-dii.ln1@bertha.auton.me.uk...
>> DS275s use less power from their host and are smaller, so are nice
>> for tiny/cheap things which will be attached to a PC.
>
> But they themselves are not so cheap. MAX232 on other order of $1 each;
> DS275 $4 or $5.
>
> And harder to find.
http://www.futurlec.com/Dallas/DS275pr.shtml
Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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Author: ZakDate: 16:31 21-11-06
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Tim Auton wrote:
> A MAX232 generates is own RS232 signalling levels from +5V. A DS275
> 'steals' power from the signal lines - it is powered by the RS232
> transmitter at the other end of the cable. DS275 are slower, will have
> more trouble with very long cables and you can't use one at both ends
> of a cable (because they rely on the other end to power them).
A friend designed something with very minimal components (2 transistors,
maybe a diode and some passives I remember) which did the same.
His design worked as well if the other side did the same, but it would
fall back to 0-5 volt signaling. I can probably dig the board up
somewhere, but I have a feeling there is a PNP transistor for xmit.
Thomas
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Author: Piotr PiatekDate: 17:00 21-11-06
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On Tue, 21 Nov 2006 22:31:03 +0100, Zak wrote:
>> A MAX232 generates is own RS232 signalling levels from +5V. A DS275
>> 'steals' power from the signal lines - it is powered by the RS232
>> transmitter at the other end of the cable. DS275 are slower, will have
>> more trouble with very long cables and you can't use one at both ends
>> of a cable (because they rely on the other end to power them).
>
>A friend designed something with very minimal components (2 transistors,
>maybe a diode and some passives I remember) which did the same.
Perhaps like this one: http://www.pisi.com.pl/piotr433/tape20.png
The circuit was tested up to 9600 baud.
Piotr
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