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BUY DS1743P-100+ https://www.utsource.net/itm/p/4401076.html
IC RTC CLK/CALENDAR PAR 34-PCM
The DS1743P-100+ is a 34-pin CMOS nonvolatile RAM (NVRAM) chip manufactured by Dallas Semiconductor. It is a low-power, low-voltage device that is used to store data in a non-volatile manner. The device features a 32K x 8 bit NVRAM memory array, a real-time clock/calendar, and a watchdog timer. It also has a built-in power-fail detection circuit that can detect when the power supply voltage drops below a certain threshold. The DS1743P-100+ is used in a variety of applications, including industrial control systems, medical equipment, and automotive systems. It is also used in embedded systems, data logging systems, and other applications that require reliable data storage. (For reference only)