The Microchip 24LC256-I/SN: A Benchmark in Serial Memory Design

In the realm of embedded systems and data storage, the ability to reliably retain configuration parameters, calibration data, or event logs is paramount. The Microchip 24LC256-I/SN stands as a preeminent solution in this space, representing a robust and highly versatile 256K I2C serial EEPROM memory chip. This device has become a cornerstone for designers seeking a simple, efficient, and dependable non-volatile memory solution.

Engineered for maximum compatibility and ease of integration, the 24LC256-I/SN boasts a 256-Kbit capacity, organized as 32,768 words of 8 bits each. This provides ample space for a wide array of applications without complicating the design. Its most defining feature is its communication protocol: the I2C (Inter-Integrated Circuit) serial interface. This two-wire interface (comprising Serial Data (SDA) and Serial Clock (SCL) lines) drastically reduces the number of I/O pins required on a microcontroller, simplifying board layout and minimizing component count. The device supports a 400 kHz clock rate, ensuring adequate speed for most data logging and retrieval tasks.

A key operational advantage of this EEPROM is its software-controlled write protection. By connecting the WP (Write Protect) pin to VCC, the entire memory array can be locked against inadvertent write operations, safeguarding critical data from corruption. Conversely, tying it to VSS allows normal read and write functions. This feature is invaluable in final production systems where data integrity is non-negotiable.

The 24LC256-I/SN is designed for resilience and endurance. It features a 1,000,000 erase/write cycle endurance per byte and a data retention period of over 200 years. These specifications ensure that data remains intact through countless system updates and over the extremely long operational life of the end product. Furthermore, its voltage range of 1.7V to 5.5V makes it perfectly suited for both low-power and wide-voltage-range applications, from battery-operated IoT sensors to industrial 5V systems.

Housed in a space-saving 8-lead SOIC (SN) package, it is ideal for modern, compact PCB designs. Its operating temperature range of -40°C to +85°C qualifies it for use in demanding industrial and automotive environments.

ICGOODFIND: The Microchip 24LC256-I/SN is an industry-standard I2C EEPROM that masterfully balances capacity, physical size, power efficiency, and data reliability. Its simple two-wire interface and robust feature set make it an indispensable component for engineers across countless applications, from consumer electronics to advanced industrial controls.

Keywords: I2C Interface, Non-Volatile Memory, Data Retention, Serial EEPROM, Low-Power Operation