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BUY DS1305N https://www.utsource.net/itm/p/1223529.html
Serial Alarm Real-Time Clock
Description: The DS1305N is a Real-Time Clock (RTC) IC from Maxim Integrated. Features: Low power CMOS technology Battery-backed RAM Real-time clock/calendar Programmable square-wave output Leap year compensation valid up to 2100 ±2 minutes/year accuracy Operating voltage range: 2.0V to 5.5V Operating temperature range: -40°C to +85°C Applications: Automotive Industrial Home appliances Medical Wearable devices Networking (For reference only)