Real time clock integrated module and device implementing such a module

A device implementing a real time clock integrated module for outputting data indicating a time-of-day and suitable for use in the device, said real time clock integrated module comprising:

• a high-precision oscillator or atomic clock having an accuracy of 50 ppb (parts per billion) or better;
• a timing circuit configured to generate time-of-day data according to a clock signal outputted from said high-precision oscillator or atomic clock;
• and
• a primary power source or a connection for connecting to a primary power source to provide power to the timing circuit when the device is powered up;
• and
• a back-up power source configured to allow the timing circuit to maintain time when the device in which the real time clock integrated module is implemented is powered off;
• said timing circuit comprising a real time clock and a logic device storing a timestamp, said timing circuit being configured to, when the device is powered off, update the timestamp value based on the high-precision oscillator or atomic clock and generate a time reference signal, said timing circuit being also configured to provide to the device said updated timestamp value and said time reference signal that the device can use as a time reference to reinitialize a timing system of the device once the device is powered up again.