BUY DS1221 https://www.utsource.net/itm/p/941422.html
Nonvolatile Controller x 4 Chip
The DS1221 is a nonvolatile, 16-pin DIP memory module manufactured by Dallas Semiconductor. It is a 1024-bit, low-voltage, CMOS NVRAM (nonvolatile random access memory) device that provides a reliable, low-power, nonvolatile storage solution for a wide variety of applications. The DS1221 features a 1024-bit nonvolatile memory array organized as 128 bytes of 8 bits each. It is a low-voltage device that operates from a single +3V to +5.5V supply. The device also features a write protect pin that can be used to protect the memory contents from accidental write operations. The DS1221 is ideal for applications requiring nonvolatile storage of data and parameters, such as industrial and consumer electronics, medical equipment, automotive systems, and embedded systems. It is also suitable for applications requiring low-power operation and long data retention. (For reference only)