The 24AA128-I/ST: A High-Density I2C EEPROM Solution from Microchip

In the realm of non-volatile memory, serial EEPROMs remain a cornerstone for storing critical data in countless embedded systems. The Microchip 24AA128-I/ST stands out as a robust and reliable 128 Kbit electrically erasable programmable read-only memory (EEPROM) component. This chip provides a simple and efficient method for adding significant non-volatile storage to a design using the ubiquitous I²C (Inter-Integrated Circuit) serial communication protocol.

Housed in a space-saving TSSOP-8 package, the 24AA128 is ideal for applications where board real estate is at a premium. Its 128-kilobit capacity, organized as 16,384 x 8, offers ample space for storing system parameters, calibration data, user settings, and transaction logs. A key feature of this memory chip is its I2C-compatible serial interface, which requires only two bidirectional lines (SDA and SCL) for communication, dramatically reducing the number of I/O pins required from the controlling microcontroller.

The device operates across a broad voltage range of 1.7V to 5.5V, making it perfectly suited for both 5V and modern low-voltage 3.3V systems. This wide operating range ensures compatibility with a vast array of microcontrollers and processors. Furthermore, it boasts impressive endurance of 1,000,000 erase/write cycles and data retention of over 200 years, guaranteeing data integrity over the lifetime of the product.

Internally, the 24AA128-I/ST includes built-in write protection. A WP (Write Protect) pin, when tied to VCC, activates hardware write protection for the entire memory array, preventing accidental data corruption. For more granular control, the chip also supports software-controlled page write protection. It features a 64-byte page write buffer, allowing for more efficient data transfers.

With three address pins (A0, A1, A2), up to eight 24AA128 devices can be connected on the same I2C bus, enabling a total of up to 1 Mbit of memory expansion. It is designed for low-power operation, making it an excellent choice for battery-powered and portable devices.

Typical applications include:

Smart meters and instrumentation

Automotive systems

Data logging modules

Medical devices

Industrial control systems

Consumer electronics

ICGOODFIND: The Microchip 24AA128-I/ST is a premier choice for designers seeking a high-reliability, high-density, and low-power serial EEPROM. Its combination of a simple two-wire interface, substantial storage capacity, and robust data protection features makes it an incredibly versatile memory solution for modern electronic products.

Keywords: I2C EEPROM, Non-volatile Memory, 128Kbit, Microchip, Serial Interface