AT24C128C-MAHM-T: A Deep Dive into a High-Density Serial EEPROM Solution

The AT24C128C-MAHM-T is a 128-kilobit (128Kb) serial Electrically Erasable Programmable Read-Only Memory (EEPROM) integrated circuit, representing a cornerstone component for non-volatile data storage in a vast array of modern electronic systems. Manufactured by Microchip Technology, this device offers a reliable and efficient method for storing critical parameters, calibration data, and system settings.

Key Features and Architecture

Organized as 16,384 words of 8 bits each (16K x 8), the AT24C128C provides ample storage space for complex applications. Its core functionality is built around the ubiquitous I2C (Inter-Integrated Circuit) serial interface, enabling communication with a host microcontroller (MCU) using only two bidirectional lines: Serial Data (SDA) and Serial Clock (SCL). This two-wire interface drastically reduces wiring complexity and saves valuable MCU I/O pins, making it ideal for space-constrained PCB designs.

A significant feature of this chip is its 1.7V to 5.5V wide voltage operation. This allows it to function seamlessly across various power domains, from legacy 5V systems to modern low-power 1.8V platforms, ensuring design flexibility and longevity. Furthermore, the device supports a 1 MHz (5V) and 400 kHz (1.7V, 2.5V, 2.7V) clock frequency, facilitating high-speed data transfer.

For enhanced system integration and addressing flexibility, the AT24C128C incorporates hardware write-protection. When the Write Protect (WP) pin is driven high, the entire memory array is locked against write operations, safeguarding firmware and data from accidental corruption. The device also features 8 internally allocated unique device addresses, allowing up to eight identical EEPROMs to coexist on the same I2C bus, effectively expanding the available non-volatile memory to 1 Megabit on a single bus.

Reliability and Endurance

Engineered for robustness, this EEPROM boasts an impressive endurance of 1,000,000 write cycles per byte, far exceeding many alternative non-volatile memory technologies. It also guarantees 100 years of data retention, ensuring information integrity over the entire lifespan of the end product. These characteristics make it suitable for applications where data is frequently updated and must be preserved for decades.

Applications

The AT24C128C-MAHM-T is deployed across numerous industries. Common applications include:

Consumer Electronics: Storing user preferences and calibration data in smart TVs, set-top boxes, and audio equipment.

Telecom Infrastructure: Holding configuration parameters for network routers, switches, and base stations.

Industrial Automation: Storing calibration constants, device identities, and production logs in sensors, PLCs, and control systems.

Automotive Systems: Used in modules requiring non-volatile memory for fault codes and trim settings (outside of extreme temperature engine compartments).

Medical Devices: Safeguarding device settings and usage logs in various portable and stationary medical equipment.

ICGOODFIND Summary

The AT24C128C-MAHM-T is a highly versatile and reliable 128Kb serial EEPROM that excels due to its industry-standard I2C interface, wide voltage range, and exceptional data retention and endurance. Its ability to share a bus with multiple devices and its hardware write-protection feature make it a superior choice for designers seeking a robust, high-density, non-volatile memory solution.

Keywords:

I2C Interface

Serial EEPROM

Non-Volatile Memory

Data Retention

128Kb