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BUY DS1338Z-33+ https://www.utsource.net/itm/p/4400901.html
IC RTC CLK/CALENDAR I2C 8-SOIC
Description: The DS1338Z-33+ 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 CMOS technology Operating voltage range: 2.3V to 5.5V 56 bytes of NV SRAM Programmable square-wave output Battery-backed power Programmable alarms Automatic power-fail detect and switch Automatic power-on reset Automatic leap-year compensation Applications: Automotive Industrial Home appliances Medical Wearable devices IoT (For reference only)