# Driving 3V chips from 3V3 chips and vice versa

Are there going to be any problems mixing logic levels derived from chips driven by those different voltages? My initial view is "no" because of the 300mV clamping diode drops, but just checking other opinions...

• Step 1: Check whether the 3.3V parts will run at 3V and vice versa. More often than not you can fun them from the same supply. – Matt Young May 7 '15 at 13:16
• No problem running at either voltage – Dirk Bruere May 7 '15 at 13:23

I don't think that would be a problem - just make sure the 3V part's $V_{OH}$ is higher than the 3.3V part's $V_{IH}$ and the 3.3V part's $V_{OL}$ is lower than the 3V part's $V_{IL}$, and if you are really paranoid add a resistor on the line.