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The A3024 is a low power CMOS real time clock. Standby current is typically 1.2 µA and the access time is 50 ns. The interface is 8 bits with multiplexed address and data bus. Multiplexing of address and data is handled by the input line A/D. There are no busy flags in the A3024, internal time update cycles are invisible to the user’s software. Time data can be read from the A3024 in 12 or 24 hour data formats. An external signal puts the A3024 in standby mode. Even in standby, the A3024 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 triming. The A3024 can be synchronized to an external 50 Hz signal or to the nearest second or minute.