The Microchip 24LC256-I/ST: A Deep Dive into a High-Density Serial Memory Solution

In the realm of embedded systems and electronics design, reliable non-volatile memory is a fundamental component for data storage and configuration settings. The Microchip 24LC256-I/ST stands out as a premier solution, offering designers a robust and high-capacity EEPROM in a compact package. This 256-Kbit serial memory chip provides a simple interface and dependable performance, making it an ideal choice for a vast array of applications.

Architecture and Key Specifications

At its core, the 24LC256 is a 32768 x 8 (256 Kbit) electrically erasable PROM (EEPROM). Its endurance is rated for 1,000,000 erase/write cycles, ensuring long-term reliability for data that is updated frequently. Furthermore, it boasts an impressive data retention period of over 200 years, guaranteeing that critical information remains intact. The device operates on a single power supply voltage, ranging from 1.7V to 5.5V, making it compatible with both 3.3V and 5V systems and ideal for low-power and battery-operated devices.

The Power of the I2C Interface

A significant advantage of the 24LC256 is its use of the I2C (Inter-Integrated Circuit) serial communication protocol. This two-wire interface (comprising Serial Data (SDA) and Serial Clock (SCL) lines) drastically reduces the number of pins required to connect the memory to a microcontroller. This simplicity minimizes board space, simplifies layout, and lowers overall system cost. The chip supports a 400 kHz clock speed for fast data transfer and features hardware write-protection via a dedicated pin, safeguarding memory contents from unintended corruption.

Applications and Usage

The versatility of the 24LC256-I/ST allows it to be deployed in countless scenarios. It is commonly used for:

Storing system configuration parameters and calibration data.

Data logging in industrial sensors and metering equipment.

Preserving user settings and high-scores in consumer electronics.

Providing memory expansion for microcontrollers with limited internal EEPROM.

Its small TSSOP (Thin Shrink Small Outline Package) form factor ("ST" suffix) is perfectly suited for space-constrained PCB designs.

ICGOOODFIND: The Microchip 24LC256-I/ST is a quintessential high-density serial EEPROM that masterfully balances capacity, reliability, and ease of integration. Its industry-standard I2C interface, exceptional endurance, and wide voltage range make it a go-to component for engineers seeking a proven and trustworthy non-volatile memory solution across a diverse spectrum of electronic products.

Keywords:

1. I2C EEPROM

2. Non-volatile Memory

3. 256Kbit

4. Serial Communication

5. Data Storage