At 07:09 AM 29/04/98 -0400, you wrote:
>Piclisters!
>I am currently using DS1233 econo-resets that hold the MCLR line low for
>approx. 15ms, just after power-up.  My PIC application is automotive.  I
>have a very clean 5v regulator supply.  Slow power-up is not a problem.
>
>My question is:  Is this uP supervisor necessary w/ the PIC (16c76, 16c63,
>and 16F84) ????
>
>Cya-
>                         6500
>                              7000
>Dave Celsnak                    ___7500
>                               / /     8000     (Shift!)
>                             /-/
>                           / /              RPM
>                         / /
>                       / /
>
>

Slow power up may not be your problem in automotive, but brown out is. The
GM spec puts the 12V supply down to 4Volts under cranking condtions. If the
support cicruits connected to the PIC have the same supply rating, then
there is not a problem. I do think that a reset chip should be used, as
there are other considerations such as the location of the target device in
the auto and what other things are active (On the same loom)


Dennis