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Politics : Formerly About Advanced Micro Devices
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To: Bill Jackson who wrote (82313)12/8/1999 12:54:00 AM
From: Elmer  Read Replies (1) of 1576887
 
Re: "Elmer, How long does it take to do a thermal dissipation test on a finished CPU? Does Intel do 100 million of them?
Or do they do parametric testing and from that with reference to a data base of tested parts determine that this will be a hot part and that will be a cool part and rate them accordingly? I suspect it is done this way. It would take 10-20 minutes for an equilibium to be reached, so they must have a data base of voltage versus current versus speeds of clock and they run those points and place the part in that "data cube" and from there they mark and sell it. Now one of you works for a railroad, and i do not think it is Petz."

Bill, I have answered all these questions already. I guess you missed them twice.

The heat dissipation properties of the package are known. The test temperature is known because it is controlled so the ability for the package to wick away the heat is easily calculated. The voltage is known and the average current is measured. Therefore the heat generated by the die is known. A limit can be set whereby an excess current, would consume more power than specified in the data sheet, as well as exceed the ability of the package to dissipate the heat if the test conditions were to be continued. It is not based on empirical data but physics. Such a test would consume perhaps 100ms. This is not a unique test used only by Intel or AMD but industry standard test methodology and I'm getting a little tired of discussing IC Test Methodology 101. If you don't believe me then... don't believe me.

EP
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