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BUY DS1220AD-120 https://www.utsource.net/itm/p/1568540.html
NVRAM Battery Based
Description: The DS1220AD-120 is a nonvolatile SRAM memory device manufactured by Dallas Semiconductor. It is a 24-pin DIP package. Features: Low power consumption Nonvolatile memory Fast access time Low standby current High reliability Easy to use Low cost Applications: Automotive Industrial Medical Networking Telecommunications Data logging Security systems (For reference only)