Real time clock integrated module and device implementing such a module

Abstract

A device implementing a real time clock integrated module for outputting data indicating a time-of-day. The real time clock integrated module includes: a high-precision oscillator or atomic clock having an accuracy of 50 ppb (parts per billion) or better; a timing circuit for generating time-of-day data according to a clock signal outputted from the oscillator or atomic clock; a power source allowing the timing circuit to maintain time when the device is powered off. The timing circuit includes a real time clock and a logic device storing a timestamp. The timing circuit is configured when the device is powered off to update the timestamp value based on the oscillator or atomic clock and to generate a time reference signal and to provide to the device the updated timestamp value and the time reference signal that the device can use as a time reference once the device is powered up again.