The Microchip 24LC256T-I/ST: A Deep Dive into a High-Density Serial EEPROM Solution

In the realm of embedded systems and electronics design, the reliable non-volatile storage of data is a fundamental requirement. For applications ranging from consumer electronics to industrial systems, the Microchip 24LC256T-I/ST stands out as a premier solution, offering a robust combination of high density, simplicity, and low-power operation. This 256-Kbit I2C serial EEPROM memory chip provides designers with a versatile and dependable component for data logging, configuration storage, and parameter retention.

Core Features and Architectural Advantages

The 24LC256T-I/ST is built on Microchip's advanced CMOS technology, which is central to its exceptionally low power consumption during both active read/write operations and standby modes. This makes it an ideal candidate for battery-powered and portable devices where energy efficiency is paramount.

A key feature of this chip is its density of 256 Kbits, organized as 32,768 words of 8 bits each. This substantial memory space is managed through a sophisticated internal architecture that supports random and sequential read operations. The device operates on a single power supply voltage, ranging from 2.5V to 5.5V, providing significant flexibility for integration into both 3.3V and 5V systems.

Communication is handled via the ubiquitous I2C (Inter-Integrated Circuit) serial protocol. This two-wire interface (comprising Serial Data SDA and Serial Clock SCL lines) drastically reduces the number of I/O pins required on the host microcontroller, simplifying board layout and minimizing system cost. The 24LC256T-I/ST supports clock frequencies up to 400 kHz, ensuring adequate data transfer speeds for a wide array of applications.

Enhanced Reliability and Data Protection

Data integrity is a critical concern. This EEPROM incorporates several features to safeguard information. It features a hardware write-protect (WP) pin that, when asserted, prevents any write operations to the entire memory array, protecting vital data from accidental corruption. Furthermore, the device is designed for high endurance, supporting over 1 million erase/write cycles per byte. Its data retention period is rated at an impressive 200 years, ensuring that information remains intact for the lifetime of virtually any product.

The chip is offered in an 8-lead TSSOP (ST) package, which is well-suited for space-constrained PCB designs. Its industrial temperature range (-40°C to +85°C) guarantees stable and reliable operation even in harsh environmental conditions.

Typical Applications

The 24LC256T-I/ST finds its place in a diverse set of applications:

Storing calibration data, user settings, and system parameters in industrial control systems.

Data logging in portable medical devices and meters.

Acting as a memory expansion for microcontrollers in automotive subsystems.

Storing network configuration and event history in smart grid and IoT nodes.

ICGOOODFIND

The Microchip 24LC256T-I/ST is a high-performance, high-density serial EEPROM that masterfully balances capacity, power efficiency, and physical size. Its industry-standard I2C interface and robust data protection features make it an exceptionally versatile and reliable choice for designers seeking a non-volatile memory solution for demanding applications.

Keywords:

1. I2C Serial EEPROM

2. Non-Volatile Memory

3. Low-Power Consumption

4. Data Retention

5. Hardware Write-Protect