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BUY DS1302 https://www.utsource.net/itm/p/911546.html
Using the Dallas Tricklecharge Timekeeper
Description: The DS1302 Real-Time Clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Features: Low-power consumption Real-time clock/calendar 56 bytes of NV SRAM Simple serial port Battery-backed power Low-voltage design 2-wire bidirectional data transfer Clock/calendar registers Programmable square-wave output Trickle-charge facility Applications: Battery-backed clock/calendar Automotive Industrial Consumer Portable Computer peripherals Security systems Telecommunications (For reference only)