The M28C64 series from STMicroelectronics is a lineup of various Electrically Erasable Programmable Read-Only Memory (EEPROM) chips, available in different package types and speeds. These EEPROMs are commonly used in a wide range of embedded systems and applications where non-volatile storage is needed but frequent reprogramming isn't required. If you're working on projects that need to store small amounts of configuration data or calibration values that don't change often, these EEPROMs are a go-to solution.

One thing worth noting is the variety in package options—these chips come in DIP, SOIC, TSSOP, and QFN packages, which makes them adaptable to a broad spectrum of board designs. Engineers tend to reach for this when they need a simple, reliable way to store data that needs to persist through power cycles but doesn't require the speed or complexity of Flash memory.

Another practical aspect is their speed. While they aren't designed for high-speed data transfer, the M28C64 series offers reasonable write and read times, making them suitable for tasks like storing configuration settings or sensor calibration data. They also support I2C and SPI interfaces, which simplifies integration into microcontroller-based systems.

Overall, the M28C64 series provides a robust and flexible solution for non-volatile storage in embedded systems, offering a good balance between performance and cost.