Hi All,

We usually care about how high the ambient or die temp is, sometimes we choose 85C or 150C as our datasheet max temp.
At high temp, data stored in the memory could be lost, modeling can be not accurate, leakage goes high...

And here comes the question, what could go wrong at very low temp so that we usually want to limit it to be -40C.
What in the manufacturing process can allow us to go lower than that?

Considerations for operation of CMOS integrated circuits outside their cataloged temperature
Designing for Extreme Temperatures
Low Temperature Effects on CMOS Circuits