Re: Power-On Reset

From: Jim Thompson (thegreatone_at_example.com)
Date: 02/22/05 

Date: Tue, 22 Feb 2005 10:43:35 -0700

On Tue, 22 Feb 2005 16:57:16 GMT, Paul Rako
<s_p_ortsterpa_u_l@yahoo.com> wrote:

[snip]
>
>If JT has a circuit that he can vary process corners it looks like he
>understands the grief of doing a POR.

I've been thru MUCH grief in my design lifetime, that's why I'm
cautious as hell.

>I have worked with a lot of
>digital guys that just can't comprehend that gate-level SPICE just
>does not work when the rails are at 1.7 volts.

Digital guys are amusing, aren't they ?:-)

>Heck, Bob Pease would
>say that analog SPICE doesn't work much better (;^o)-

I think Bob is becoming over-exaggerative in his old age. Picks
absurd examples. Must be running out of material for his column.

(Of course I'm a young man compared to Bob. He graduated MIT in 1961,
I graduated MIT in 1962 :-)

>
>Hot-swap circuits are equally non-trivial. Did the card get stuck
>in for a millisecond, then yanked out, then stuck back in-- what is
>the state of all the circuits on both the mother and daughtercard..
>ect ect ect
>
>Paul
>
[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
;-)

                                        ...Jim Thompson 

-- 
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
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