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Re: Caller ID unit.
On Wed, 2003-07-02 at 00:20, David Gumbrell wrote:
> Well, you beat me to it then.
>
> The Mitel (MT88E43BS) is the chip with the RS232 almost compatible
output.
Pin 17 of the chip is data out, (5th up from the bottom right) but at
CMOS level rather than TTL.
Jon Payne's circuit
(http://www.photon.dyndns.org/projects/btcd50conversion/index.html)
uses
a MAX232 chip to convert to RS232 (hint, get a free sample of them from
www.maxim-ic.com), the data sheet for which says input is either cmos
compatible.
Can someone confirm that Jon's circuit will work with CMOS level input?
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