Author: Robert Hyatt
Date: 20:42:08 02/11/00
Go up one level in this thread
On February 11, 2000 at 12:10:31, Tom Kerrigan wrote:
>On February 11, 2000 at 08:29:37, Robert Hyatt wrote:
>
>>Sure... but give me a citation for a faster switching time. I am looking at
>
>Microelectronic Circuits, fourth edition, Sedra & Smith. ("The Book.") Middle of
>page 375. Vt and k' change with temperature. Now look at page 1054 and 1055.
>tPHL and tPLH are both dependent on k'.
>
>>a data book right this second, that is describing the properties of a specific
>>OR gate. It gives the settling time for the range of temperatures 0c - 60c,
>
>Are you looking at a TTL OR chip? I bet there are a number of reasons why you
>shouldn't compare a TTL chip to the Athlon...
>
>>and the settling time is constant. I don't see any way to operate a gate
>>below 0c in a real machine. IE Cray couldn't do it because any exposure to
>
>Are you confusing C with K? 0C is freezing. You're suggesting that my pocket
>calculator wouldn't work if I took it outside right now... :)
>
>-Tom
I am definitely talking about 0c. You take the cpu to that temp, it won't last
long as you get ice crystals, which play hell with gigahertz frequencies. That
was why the cray was never taken below freezing until the immersion versions and
they were not much below 0.
at 0c, in a room with 70 degrees, 50% relative humidity, you get condensation
as you approach 0c. And you get ice if you go below that... that was the
problem I was talking about..
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