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BUY DS1305 https://www.utsource.net/itm/p/26295.html
Serial Alarm Real Time Clock RTC（RTC）
Description: The DS1305 is a real-time clock (RTC) and calendar with 56 bytes of nonvolatile user RAM. Features: Real-time clock/calendar with leap year compensation valid up to 2100 56 bytes of nonvolatile user RAM Timekeeping accuracy of ±2 minutes/year at 25°C Programmable clock/calendar with two alarms Power-fail detect and reset Battery backup input for continuous timekeeping Low power CMOS technology Available in 8-pin PDIP, 8-pin SOIC, and 20-pin TSSOP packages Applications: Personal computers Network servers Point-of-sale terminals Set-top boxes Industrial controllers Home automation systems Security systems (For reference only)