sbright33:
...Or even 10ppm with some effort which is 1 second every 100 days, or 3 seconds per year....
Pardon my ignorance. I thought lower PPMs were better than higher PPMs re: clock drift. Why would an increase to 10PPM drift be preferable to 1PPM? Did you perhaps mean 0.1PPM or 100PPB?
I thought the whole point of adjusting the aging trim in the DS1307 or DS3201 was to minimize the clock drift.