The AT25040B is a 4 Kbit Serial Electrically Erasable Programmable Read-Only Memory (EEPROM) from Atmel. It is organized as 512 words of 8 bits each and features a Serial Peripheral Interface (SPI) for communication. This device is designed for applications requiring low-density, non-volatile memory storage.

Applications:

• Consumer electronics
• Industrial control systems
• Medical devices
• Automotive applications
• Data logging
• Configuration storage
• Robotics

Features:

• 4 Kbit (512 x 8) EEPROM
• Serial Peripheral Interface (SPI)
• High-speed clock frequency: Up to 10 MHz
• Low-voltage operation: 1.8V to 5.5V
• Write protect feature for hardware data protection
• High reliability: 1 million erase/write cycles
• Data retention: 100 years
• Self-timed write cycle
• Available in various packages: SOIC, TSSOP, PDIP

Benefits:

• Non-volatile data storage: Retains data even when power is removed.
• Fast SPI interface: Enables high-speed data transfer.
• Low voltage operation: Suitable for battery-powered applications.
• Data protection: Prevents accidental data corruption.
• High endurance: Can withstand a large number of write cycles, extending product lifespan.
• Small form factor: Available in compact packages, saving board space.

Additional Details:

The AT25040B is accessed via a standard SPI interface, allowing for easy integration with microcontrollers and other SPI-compatible devices. The write protect feature can be used to prevent accidental overwriting of data. The self-timed write cycle simplifies the programming process. It's essential to consult the datasheet for specific timing characteristics, voltage levels, and other operational details. The operating temperature range typically spans from -40°C to +85°C. This is the B revision of the part which typically denotes improvements or errata fixes.