The AT25256B is a 256Kbit serial EEPROM (Electrically Erasable Programmable Read-Only Memory) from Atmel, now Microchip Technology. It utilizes a standard SPI (Serial Peripheral Interface) for communication, allowing for easy integration with microcontrollers and other digital systems. The device is commonly used for storing configuration data, user settings, or other non-volatile information in embedded applications.

Applications

• Storing configuration settings
• Storing user preferences
• Data logging
• Storing calibration data
• Secure storage of keys or certificates

Features

• 256Kbit (32K x 8) EEPROM
• Standard SPI interface
• Low-voltage operation
• Write protect feature
• Self-timed write cycle
• High reliability and endurance

Benefits

• Non-volatile storage - data is retained even when power is removed
• Simple SPI interface - easy to connect to microcontrollers
• Low power consumption - suitable for battery-powered applications
• Write protection - prevents accidental data modification
• High endurance - can withstand many write cycles

Additional Details

The AT25256B supports SPI clock frequencies up to a specified maximum. It features a self-timed write cycle, simplifying write operations. The device incorporates a write protect input to prevent accidental data corruption. The AT25256B is available in various packages, including SOIC and TSSOP. It is an End-Of-Life part from Atmel/Microchip, so availability should be considered in new designs.