Originally Posted by
dbsonic
What's nominal voltage rating on the Microchip IC? Industry standard is +/- 10% VCC for all physical design rule checks at tapeout and also later for characterization. Beyond that on the high end you risk electromigration(hold time checks could fail too on the sequential logic etc, list goes on).
Absolute maximum Ratings for VCC (for stress test only, functionality not guaranteed but no physical damage to the device) is -0.3V ... +6.5V
DC Charasteristics (Operational conditions ratings): 1.8/2.5 - 5.5V depending on the used frequency.
I don't know Microchips internal VCC design targets.
Ilkka