Re: Power-On Reset
From: Keith Williams (krw_at_att.bizzzz)
Date: 02/22/05
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Date: Tue, 22 Feb 2005 15:01:49 -0500
In article <c1vm119m9fhregkak342gsrdupevesdiq6@4ax.com>,
thegreatone@example.com says...
> On Tue, 22 Feb 2005 13:27:05 -0500, Keith Williams <krw@att.bizzzz>
> wrote:
>
> >In article <6drm11lo7k4pad5b1rcuooknfh6bqchodh@4ax.com>,
> >thegreatone@example.com says...
> [snip]
> >>
> >> My application isn't hot-swap, but it's similar... even has a
> >> charge-pump, which turned out to be helpful in making the POR timing
> >> ;-)
> >
> >Does your charge-pump operate with 1.7V rails? ;-) .25V?
>
> The specification requires 1.65V <= VDD <= 5.5V, over process corners
> and -40°C to +105°C
>
> I PASS ;-)
I chose .25V because one POR circuit requirement was for an active low
to be guaranteed above a .25V VCC, until the power supply was within
spec and stable for some period. Forcing a low voltage with a .25V
rail, under worst case conditions, wasn't an easy thing to guarantee.
-- Keith
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