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AT-89C52
125°C DYNAMIC OPERATING LIFE TEST
LOT
NUMBER
DATE
CODE
SAMPLE
SIZE
TOTAL
CKT-HRS(K)
NUMBER
OF FAILURES
4D1707
4D1707A
5A1634
4B9441
4D9505
5A9517
115
164
143
287.5
410.0
357.5
0
0
0
FAILURE RATE
TOAL DEVICE HOURS
BEST ESTIMATE
50°C AMBIENT
1,055,000 DEVICE HOURS
λ = 0.07% PER 1,000 HOURS
EXTRAPOLATION TO 50°C.VIA
ARREHENNIUS EQUATION AND
ACTIVATION ENERGY OF 0.5eV
λ = 0.002% PER 1,000 HOURS (23 FITS)
CONFIDENCE ESTIMATE
λ 60 = 0.003% PER 1,000 HOURS
60% CONFIDENCE (30 FITS)
λ 90 = 0.007% PER 1,000 HOURS
90% CONFIDENCE (74 FITS)
ATMEL [ ATMEL ]
