I surveyed I2C RTC chips for a new product 6 months ago. At the time, I
found the DS1307 to be the best in terms of price/availability ($1.70/in
stock at lots of places).

The 10 year backup with a single CR2032 battery is nice too.

Paul

> Hello,
>
>     I think this was already covered here, but I've searched the archives
> and found nothing interesting.
>
>     The PIC is very precise for using one of the interrupts as an RTC?
> Obviously, I mean a PIC in equipment that is always on.
>
>     Or is it more recomendable to use an RTC-on-a-chip like the ones from
> Dallas (DS1307)? What is the more common/cheap/simple RTC that uses I2C?
>

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