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BUY DS12885 https://www.utsource.net/itm/p/26355.html
Real Time Clock
Description: Real-Time Clock/Calendar Features: - 24-pin DIP package - Battery-backed RAM - Clock/calendar provides seconds, minutes, hours, day, date, month, and year information - Programmable square-wave output signal - Interrupt output signal Applications: - Automotive - Industrial - Telecommunications - Networking - Computing - Medical (For reference only)