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BUY DS1302ZN+ https://www.utsource.net/itm/p/11708924.html
IC RTC CLK/CALENDAR SER 8-SOIC
Description: The DS1302ZN+ is a Real-Time Clock (RTC) and Calendar integrated circuit from Maxim Integrated. It is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Features: Low-power operation: 0.4 μA at 1.8 V Real-time clock/calendar 56 bytes of NV SRAM BCD clock/calendar Programmable square-wave output Power sense and reset input Low-voltage operation SPI compatible Applications: Automotive Industrial Medical Consumer Networking Telecommunications (For reference only)