I've got some 5V MCUs whose rating is 3.3V Min to 5.5V Max. My question is whether running them at a "nominal" 3.3V is OK.
I can imagine that a 3.3V source runs typically at ~3.35V, so no problem. And I know that if the voltage drops to 3.29V the MCU won't suddenly quit - probably.
The reason I ask is that I have some 3.3V components that I'd like to interface to it, and they can't handle 5V as well as it can handle 3.3V. Given that most 3.3V components max out at 3.6V, maybe I should run them all at 3.45V (if I can design the non-standard power supply)?
I guess I'm asking whether 'tis better to use a "standard" voltage, or up it a little to satisfy both sides of the equation.
As requested: the datasheet. Please see page 423, under "DC Specification (5V MCU)"