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BUY DS1248YP-70+ https://www.utsource.net/itm/p/4399050.html

The DS1248YP-70+ is a nonvolatile static RAM (NVRAM) manufactured by Dallas Semiconductor. It is a 32K x 8 bit NVRAM with an integrated lithium battery backup. The device is packaged in a 24-pin DIP package. The device has a low power CMOS design that allows it to retain data for up to 10 years with a lithium battery backup. It also has a built-in power-fail detection circuit that will detect when the power is lost and switch to the battery backup. The device is used in applications where data needs to be retained in the event of a power failure. It is commonly used in industrial and automotive applications, as well as in medical and military applications. It is also used in embedded systems, such as routers and switches. (For reference only)