Some questions around the max temp that an AVR can run at:
1) Atmega's come in three temp ratings, industrial (up to 85degC) extended industrial (up to 105 degC) and Automotive (up to 125 degC). But what actually is the difference in terms of what's in the IC? Is there ANY difference? or are the EOL qualification tests just different?
2) When you 'overheat' an IC what actually happens? Assuming you stay under the temp the solder melts at, so it doesn't fall off the pcb ;-) what happens to the physics of the thing that results in it's temperature rating?