I'm thinking of migrating from an I2C bus at 400 kHz to one running at nearly 1 MHz.
I am using 1.2k pull-ups at the moment and on the clock and data lines, I get a rise time of 383ns average when sending out pulses. Fall time is approaching the limits of a 100 MHz oscilloscope at ~15ns. Are there potential issues with this kind of rise time? What about noise and signal integrity? Clock jitter? etc. Would there be significant issues? I will probably stick with 400 kHz on my breadboard which works fine, but the final product may use 1 MHz I2C.