The Maxim DS1337U+T&R is a Clock/Calendar real-time clock with an I²C (2-wire serial) interface, integrating alarm, leap-year compensation, and a programmable square-wave output.
Timekeeping current — why 0.6 µA matters for the BOM
The 0.6 µA maximum timekeeping current at 1.3 V–1.8 V is the headline spec for battery-life budgeting. In a coin-cell-backed RTC application, that draw extends backup runtime.
I²C interface and features
Communication is over a standard I²C (2-wire serial) bus, compatible with virtually every modern MCU. The alarm output and square-wave output (programmable frequency) can serve as a wake-up source or a periodic interrupt without polling the bus.