driven. Open-Drain on the other hand can be handled with a MOSFET for
two-way or even a diode for one-way depending on the levels, but this means
significant numbers of external components if the number of lines is large.
So, selecting a fixed voltage (such as 1.8v or 3.3v) results in a bit of a
problem: external level-shifting is required on pretty much absolutely every
driven. Open-Drain on the other hand can be handled with a MOSFET for
two-way or even a diode for one-way depending on the levels, but this means
significant numbers of external components if the number of lines is large.
So, selecting a fixed voltage (such as 1.8v or 3.3v) results in a bit of a
problem: external level-shifting is required on pretty much absolutely every