> The spec sheet states a Vdd voltage level below which the processor should
> be in reset mode and above which it should be operational. No requirements
> are placed on the rise time of Vdd to meet reset conditions.

In theory if they don't say it matters, than it shouldn't.  On the other
hand, they didn't come right out and give a rise time spec or say that it is
allowed to be infinitely slow.  I would consider this spec as "missing"
rather than interpret it that infinitely slow is OK.  I would talk to the
manufacturer.  If they are unwilling or unable to guarantee the infinite
rise time spec and deliver parts to that spec, then you have two choices:

1 - Use a different part if you can find one.

2 - Redesign the circuit to guarantee a maximum rise time.

I know you don't like either option, but that's where you're at.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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