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BUY DS1339U-33+T&R https://www.utsource.net/itm/p/11685569.html
IC RTC CLK/CALENDAR I2C 8-USOP
Description: Real-Time Clock/Calendar with Alarm and Trickle-Charge FET Features: Real-Time Clock/Calendar Counts Seconds, Minutes, Hours, Date, Month, Day, and Year with Leap Year Compensation Valid Up to 2100 Two Time-of-Day Alarms Programmable Square-Wave Output Programmable Interrupt Output Programmable Trickle-Charge FET Battery-Backup Input I2C Interface Operating Temperature Range: 40°C to +85°C 8-Pin MSOP Package Applications: Networking Automotive Industrial Medical Consumer Telecommunications (For reference only)