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BUY DS1220AD-150 https://www.utsource.net/itm/p/1406418.html
NVRAM Battery Based
Description: The DS1220AD-150 is a nonvolatile static RAM (NVSRAM) from Dallas Semiconductor. It is a 24-pin DIP package device with a 150ns access time. Features: - 150ns access time - Low power consumption - Nonvolatile memory - 24-pin DIP package - Data retention of 10 years - Low voltage operation Applications: - Automotive applications - Industrial control systems - Data logging - Embedded systems - Battery-backed RAM (For reference only)