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BUY DS1642-100 https://www.utsource.net/itm/p/11655454.html

Description: The DS1642 is a nonvolatile timekeeping device that includes a real-time clock/calendar and 56 bytes of battery-backed RAM. Features: Real-time clock/calendar with century 56 bytes of battery-backed RAM Clock accuracy of 卤2 minutes/month at 25掳C Battery-backed write protection Battery-backed RAM write protection Low power CMOS technology Automatic power-fail detect and switch Multiple power-fail detect options Low power consumption Available in DIP24 package Applications: The DS1642 is ideal for applications that require an accurate real-time clock/calendar and battery-backed RAM. Examples include: Automotive systems Industrial control systems Networking systems Point-of-sale systems Security systems Telecom systems (For reference only)