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The V3025 is a low power CMOS real time clock with an integrated battery switchover. The standby current is typically 2.5µA and the access time is 50ns. The interface is a multiplexed address and data 8 bits bus. The input line A/D handles multiplexing of address and data. There are no busy flags in the V3025, internal time update cycles are invisible to the user’s software. Time data can be read from the V3025 in 12 or 24-hour data formats. An external signal puts the V3025 in standby mode. Even in standby, the V3025 pulls the IRQ pin active low on an internal alarm interrupt. Calendar functions include leap year correction and week number calculation. The V3025 can be synchronized to an external 50 Hz signal or to the nearest second or minute. The integrated battery switch-over supply the real time clock part by VDD as long as VDD is higher than VBAT. When VDD decreases under VBAT, the output /PFO comes active and the real clock is supplied by the battery or the supercap.