In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Excellent clean solution Bean.  You can easily use debugging too.

I have been checking an it seems 74HC?? are the best logic to use with 3.3, but they use a bit more power than the 4000 series and the 74C?? logic.  The later seem to have more quirks due to their earlier design and may have more trouble reaching down to 3.3v.

Is that correct?

I suppose much of this many not be an issue as most of the devices that interface with the SXes don't require bits of logic and are rated at 3.3V or not.  But I still seem to thing that there is always the need to use these elements to 'glue together' something innovative.

Nobody has mentioned the big advantage that 3.3volts provides to avoid EMI problems.  Less voltage and less amps mean less power to drive those harmonics at the higher frequency.  And, a lot less internal heat in the microprocesser.  It just gets better and better.

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