AT24C256 2ECL IIC/I2C EEPROM Serial Interface Memory Module

AT24C256 2ECL IIC/I2C EEPROM Serial Interface Memory Module is a 256K-bit Electrically Erasable Programmable Read-Only Memory (EEPROM) device that communicates using the I2C interface. This module is ideal for microcontroller-based systems requiring non-volatile data storage such as configuration settings, calibration data, and user preferences. It supports multiple I2C addresses and provides reliable, rewritable memory over many cycles.

Key Features:

• Large Capacity: 256Kb (32KB) of non-volatile memory.
• I2C Interface: Supports standard two-wire serial communication.
• Multiple Device Support: Up to 8 modules can be connected on the same bus via address jumpers.
• Low Power Consumption: Efficient standby and write modes.
• Reliable Write/Erase Cycles: Over 1 million write/erase cycles with data retention of up to 100 years.

Technical Specifications:

• Memory Size: 256Kb (32KB)
• Interface: I2C (Two-Wire Serial Bus)
• Operating Voltage: 1.7V to 5.5V
• Write Time: 5ms typical
• Max Clock Frequency: 400kHz
• Addressing: 7-bit address with up to 8 selectable devices

Mechanical Specifications:

• Module Dimensions: Approx. 25mm × 15mm
• PCB Material: FR-4 with dual mounting holes
• Pin Headers: 4-pin male header (VCC, GND, SDA, SCL)
• Mounting: Breadboard and PCB compatible

Mounting Options:

• Breadboard Use: Easily plug into breadboards using 2.54mm pitch pins.
• PCB Mounting: Solderable through-hole pins for permanent installation.

Schematic Diagram, Connection, Wiring and Pinout:

• Pinout: VCC (3.3V/5V), GND, SDA (Data), SCL (Clock)
• Connection: Connect SDA/SCL to microcontroller I2C lines with pull-up resistors if needed.
• Address Jumpers: A0, A1, A2 pads for setting I2C address manually.

Datasheet and Documentation:

• Download AT24C256 Datasheet (PDF)

Applications:

• Microcontroller Projects: Store user preferences, logs, and runtime data.
• Embedded Systems: Maintain configuration or calibration data.
• RTC Modules: Pair with real-time clocks to log timestamped data.
• Industrial Systems: Non-volatile storage in control boards.
• Sensor Modules: Save thresholds or last measured values.

Equivalent Models:

• AT24C128: Lower capacity variant with same I2C interface
• 24LC256: Microchip-compatible EEPROM with similar specs
• CAT24C256: ON Semiconductor alternative with full I2C compatibility

Package Includes:

• 1 x AT24C256 IIC/I2C EEPROM Serial Memory Module