BUY DS1235YW-150 https://www.utsource.net/itm/p/1457407.html
256kSRAM
Description: The DS1235YW-150 is a nonvolatile SRAM manufactured by Dallas Semiconductor. It is a 28-pin DIP (dual in-line package) device that provides a low-power, low-cost, and reliable alternative to battery-backed RAM. Features: - Low power consumption - Nonvolatile memory - Fast access time - Easy to use - Low cost Applications: - Automotive - Industrial - Medical - Telecommunications - Networking - Embedded systems - Data logging (For reference only)