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BUY DS1307N+ https://www.utsource.net/itm/p/11540368.html
IC RTC CLK/CALENDAR I2C 8-DIP
Description: The DS1307N+ is a Real-Time Clock (RTC) IC from Maxim Integrated. It 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 I2C/SMBus compatible Automatic power-fail detect and switch Battery-backup input Temperature-compensated crystal oscillator Programmable square-wave output Operating temperature range: -40°C to +85°C Applications: Automotive Industrial Medical Portable devices Wearable devices Home appliances Security systems Smart meters (For reference only)