MM58274CN

MM58274CN: Microprocessor-Compatible CMOS Real-Time Clock/Calendar IC, featuring timekeeping registers spanning from tenths of seconds up to tens of years. Operating down to a 2.2V threshold to accommodate low-power battery backup installations, it incorporates a built-in 32.768 kHz crystal oscillator control loop, leap-year compilation, and an open-drain interrupt output, housed in a standard 16-pin through-hole plastic DIP package profile. Manufactured by National Semiconductor. [1, 2, 3, 4]