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Technology Stocks : Advanced Micro Devices - Moderated (AMD) -- Ignore unavailable to you. Want to Upgrade?

To: Bill Jackson who wrote (66680)	12/30/2001 8:44:38 PM
From: Elmer	Read Replies (1) \| Respond to of 275872

Elmer, I see, there is not much the wafer can do to get rid of heat so they will make the test short and possibly slower and use some kind of propagation test to see where the parts will speed bin(approx). Does the entire wafer speed bin more or less the same or is there wide or gradual variation as you roam the wafer? The wafer could be heated intentionally on the wafer and sometimes this is done but now many companies are actually chilling the wafers for test. This guarantees cold operation. So even a speed test at wafer sort in inconclusive because speed is worst case hot. As for variation, in general there is more variation lot to lot than wafer to wafer and still less die to die on the same wafer. Incidently, speed correlates closely with leakage currents because leakage correlates with channel lengths. This is one of the reasons AMD will not publish their standby currents at 100deg like Intel does. If they did it would show how they are running their process on the ragged edge. EP