On Wed, 23 Oct 2002, llile@SALTONUSA.COM wrote:

*>I constructed a circuit using an NPN transistor yesterday, C to VDD, E to
*>MCLR, B to my filtered input voltage. (many ways are possible).  I am not
*>happy with it because of excessive parts count, and also the whole shebang
*>rebooted a time or two when a noise pulse came along on the Vdd line.

Excessive parts count ? I thought you say part, not parts, for a single
transistor, no ? You should try  Dwayne Ried's circuit. PNP with C to GND,
B to Vdd, E to MCLR, and input your signal to MCLR through a resistor.

*>I'll try your simpler diode clamp to VDD today and see how far I get with
*>it.  Apparently people are saying if MCLR does not rise more than a diode
*>drop above Vdd it should be safe, although I cannot determine that from
*>the spec sheets.

Look at the absolute maximum ratings. It should be there somehwere.

Peter

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