The AT24C256C-XHL-T: A High-Density I2C Serial EEPROM Solution from Microchip

In the realm of embedded systems and IoT devices, the need for reliable, non-volatile memory for data storage and configuration settings is paramount. The AT24C256C-XHL-T from Microchip Technology stands out as a robust and efficient solution, offering 256 kilobits (32 kilobytes) of serial Electrically Erasable Programmable Read-Only Memory (EEPROM). This memory chip provides a critical function for storing data that must be retained even when system power is removed.

A key feature of the AT24C256C-XHL-T is its utilization of the I2C (Inter-Integrated Circuit) serial interface. This two-wire serial protocol, comprising a Serial Data Line (SDA) and a Serial Clock Line (SCL), drastically reduces the number of pins required for communication with a host microcontroller (MCU). This simplicity makes it an ideal choice for space-constrained PCB designs, simplifying layout and reducing overall system cost. The device supports a 400 kHz (Fast-mode) clock frequency, enabling efficient and sufficiently rapid data transfer for a wide array of applications, from sensor data logging to device parameter storage.

The internal 256Kb memory space is organized as 32,768 words of 8 bits each. To effectively manage this space, the chip incorporates advanced addressing. It supports up to four devices on the same I2C bus through hardware-configurable address pins (A0, A1, and A2), allowing for a combined total of 128KB of memory from a single bus. Furthermore, it features sequential read capability, which allows the internal address pointer to automatically increment after each read operation, enabling the host MCU to stream large blocks of data efficiently without the need to transmit the memory address for every byte.

Designed for resilience and longevity, this EEPROM is built for demanding environments. It is rated for endurance of 1,000,000 write cycles per byte, significantly higher than many flash memory alternatives, making it suitable for applications with frequent data updates. Data retention is guaranteed for over 100 years, ensuring integrity for the lifetime of virtually any product. The device also features a hardware write-protect pin that, when asserted, safeguards the entire memory array from inadvertent writes, adding a crucial layer of data security.

Housed in a space-saving 8-lead TSSOP package, the AT24C256C-XHL-T is well-suited for modern, compact electronic designs. Its extended industrial temperature range (-40°C to +85°C) ensures reliable operation in harsh conditions, making it a versatile component for automotive, industrial, medical, and consumer applications.

ICGOOODFIND: The Microchip AT24C256C-XHL-T is a highly reliable and industry-standard I2C EEPROM. Its optimal blend of density, interface simplicity, and proven durability makes it a default choice for designers seeking a no-compromise non-volatile memory solution.

Keywords: I2C Interface, Serial EEPROM, Non-Volatile Memory, Data Storage, Microchip Technology.