DS1307ZN+, Часы реального времени, будильник, ОЗУ 56-бит, последовательный интерфейс, 3В, 500нА, [SO-8]

Real Time Clock with NV Memory, Maxim Integrated Real Time Clock with NV Memory, Integrated
A range of real-time clock products from Maxim incorporating non-volatile RAM memory for data retention. The clock/calendar functions provide seconds, minutes, hours, day, date, month, and year information. The clocks generally operate in either the 12 or 24-hour format with an AM/PM indicator. Additional features may include watchdog timers, alarms and trickle-charging facilities for external back-up batteries; some devices are available which include an integrated crystal for the clock oscillator.

Real-Time Clock (RTC)