From: "petrus bitbyter"
Subject: Re: Level shifter design
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
Date: Fri, 27 Sep 2002 13:21:05 GMT
NNTP-Posting-Date: Fri, 27 Sep 2002 15:21:05 MET DST
Organization: chello broadband
What do you mean by making it yourself? MAX3223 and SP3223 are only IC's you
can use to build the level shifter you need. You can find all the schematics
you need on MAXIM's website http://www.maxim-ic.com in the datasheets. You
may also look for MAX232. It's by far the easiest way. You only need a small
5V power supply, the chip and some discrete components like capacitors and
If you like it more difficult you can use a MC1488 and a MC1489 or their
equivalents. Look at Texas, Motorola or others for the datasheets. You wil
need a +5V and a -5V power supply.
If you do not have the skills to build the circuits mentioned, I advise not
to try a circuit build with discrete components. You can get an idea of the
complexity of this circuits by looking at the internals of the 1488/89 in
"Jerome" schreef in bericht
> I would like to design and make a level shifter to plug a GPS to a
> RS232 port.
> The level on the serial port of the GPS is CMOS (3.3V). SO I was told
> that a good level shifter would be a MAX 3223 or SP3223.
> I would like to make the level shifter myself, but I don't know how to
> do it ( what I need, schema, ....). I have not a lot of information
> about it.