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The V3023 is a low power CMOS real time clock with a built-in crystal. Standby current is typically 1.2µA and the access time is 50ns. The interface is 8 bits with multiplexed address and data bus. The input line A/D handles multiplexing of address and data. There are no busy flags in the V3023, internal time update cycles are invisible to the user’s software. Time data can be read from the V3023 in 12 or 24 hour data formats. An external signal puts the V3023 in standby mode. Even in standby, the V3023 pulls the IRQ pin active low on an internal alarm interrupt. Calendar functions include leap year correction and week number calculation. Time precision can be achieved by digital trimming. The V3023 can be synchronized to an external 50Hz signal or to the nearest second or minute.