For the purposes of long-term time accuracy, power mains frequency is just as accurate as the NITS Atomic Clock. Because all the utility companies maintain the grid frequency against WWV.
Yeah that 'NITS' atomic clock isn't all it's hyped up to be
To satisfy my curiosity (which you're obviously under no obligation to do...), can you point to something that documents this? Oh wait, here it is: Utility frequency - Wikipedia
Digikey (where I'm buying from) only sells minimum 880. How about a cheaper 14-bit unit with a toggle (2-bit) connected to the output? 2^14*2 = 32.768kHz.
But eight dual flip flops would be 16 flip flops total... 2^16 = 65536. I'm looking for 2^15. If I use seven dual flip flops, what should I use to take the frequency from 2hz to 1hz?
I just hit my self in the head b/c I realized I am being WAY to harsh on myself. I'll just use a 65.536kHz crystal and use a dual 8-bit (16 bits total) binary counter to bring it down to 1 hz.