BUY DS1225AB-100 https://www.utsource.net/itm/p/367440.html
Low-Noise, High-Speed, 16-Bit Accurate CMOS Operational Amplifier 10-MSOP -40 to 125
The DS1225AB-100 is a non-volatile static RAM (NVRAM) chip manufactured by Dallas Semiconductor. It is a 28-pin DIP package. The DS1225AB-100 is a 256K x 8 bit NVRAM which provides a combination of static RAM and non-volatile memory. It is designed to retain data for extended periods of time without the need for an external power source. The chip is also equipped with a lithium battery backup system that will maintain data for up to 10 years. The DS1225AB-100 is ideal for applications that require data retention in the event of a power failure. It is commonly used in industrial control systems, medical instruments, and other applications that require reliable data storage. (For reference only)