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AT91M55800A Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT91M55800A Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 29 page 5 AT91M55800A 1727E–ATARM–01/04 Thermal and Reliability Considerations Thermal Data In Table 5, the device lifetime is estimated with the MIL-217 standard in the “moderately controlled” environmental model (this model is described as corresponding to an instal- lation in a permanent rack with adequate cooling air), depending on the device Junction Temperature. (For details see the section “Junction Temperature” on page 6.) Note that the user must be extremely cautious with this MTBF calculation: as the MIL- 217 model is pessimistic with respect to observed values due to the way the data/mod- els are obtained (test under severe conditions). The life test results that have been measured are always better than the predicted ones. Table 6 summarizes the thermal resistance data related to the package of interest. Reliability Data The number of gates and the device die size are provided for the user to calculate reli- ability data with another standard and/or in another environmental model. Table 5. MTBF Versus Junction Temperature Junction Temperature (TJ) (°C) Estimated Lifetime (MTBF) (Year) 100 25 125 14 150 8 175 5 Table 6. Thermal Resistance Data Symbol Parameter Condition Package Typ Unit θ JA Junction-to-ambient thermal resistance Still Air TQFP176 21 °C/ W PBGA176 66 θ JC Junction-to-case thermal resistance TQFP176 9.2 PBGA176 20.1 Table 7. Reliability Data Parameter Data Unit Number of Logic Gates 524 K gates Number of Memory Gates 400 K gates Device Die Size 29.0 mm2 |
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