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BUY M41T81SM6E https://www.utsource.net/itm/p/4838620.html
Serial Access Real-Time Clock with Alarms
Description: Real-Time Clock Features: Low power consumption I2C-bus interface Clock/calendar provides seconds, minutes, hours, day, date, month, and year information Programmable clock-out frequency Programmable square-wave output Battery switchover Automatic power-fail detect and switch Operating supply voltage range: 2.2V to 5.5V Operating temperature range: -40°C to +85°C Applications: Automotive Industrial Medical Home appliances Networking Communications (For reference only)