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BUY DS1338Z-33 https://www.utsource.net/itm/p/1111241.html
I2C RTC with 56-Byte NV RAM
Description: The DS1338Z-33 is a low-power, real-time clock/calendar with an integrated crystal and backup battery. Features: Low-power operation: 0.45μA at VCC = 3V I2C interface 56-byte, battery-backed, nonvolatile RAM Programmable square-wave output Battery-backed, power-fail input Programmable alarms Automatic power-fail detect and switchover Operating voltage range: 2.3V to 5.5V Applications: Automotive Industrial Home appliances Medical Networking and communications Security systems Wearable electronics (For reference only)