AT45DB041B-CNU

Memory IC Overview

The AT45DB041B is a 4-megabit (4,325,376 bits) SPI-compatible serial interface Flash memory organized into 2048 pages of 264 bytes each. It features two 264-byte SRAM data buffers that enable continuous data streaming and efficient reprogramming. The device operates on a single power supply ranging from 2.5V to 3.6V or 2.7V to 3.6V, supporting clock frequencies up to 20 MHz with typical active read current consumption of 4 mA and standby current of 2 µA.

Memory IC Feature Summary

• Dual 264-byte SRAM data buffers allow receiving data while the main memory array is being reprogrammed, facilitating continuous data streams.
• Single-cycle reprogramming capability combines erase and program operations for efficient page updates without requiring separate erase cycles.
• Hardware data protection via the Write Protect pin secures the first 256 pages of the main memory array against unintended modification.
• Continuous read capability through the entire array supports code shadowing applications by allowing seamless reading across page boundaries.

Memory IC Applications

• Digital voice storage
• Image storage
• Program code storage
• Data logging

Memory IC Procurement Notes

Verify the specific voltage range variant required for your design, as the AT45DB041B is available in both 2.5V-3.6V and 2.7V-3.6V specifications. Confirm package availability matches your PCB layout requirements, noting that older packages like 28-SOIC are not recommended for new designs. Ensure RoHS compliance documentation is obtained if environmental regulations apply to your manufacturing process.

Memory IC Selection Notes

Select this component when a low-pin-count, serial interface is preferred over parallel Flash memories to simplify hardware layout and reduce switching noise. It is suitable for applications requiring EEPROM-like byte alterability through its Read-Modify-Write operation. Consider the dual buffer architecture if your system demands high throughput or continuous data handling during write cycles.

Memory IC Part Context

The AT45DB041B belongs to the DataFlash family, which integrates Flash memory with SRAM buffers to overcome traditional random access limitations. This architecture allows sequential data access via SPI, reducing package size and active pin count compared to conventional parallel interfaces. It is designed for commercial and industrial environments where low voltage and low power consumption are critical.

Memory IC Replacement Considerations

For new designs, Microchip recommends using the AT45DB041D instead of the AT45DB041B. The successor devices may offer updated features or packaging options not available in the legacy model.

Memory IC FAQ

How does the AT45DB041B handle EEPROM emulation?

EEPROM emulation is handled through a self-contained three-step Read-Modify-Write operation, allowing bit or byte alterability within the Flash memory pages.

What is the function of the RDY/BUSY pin?

The RDY/BUSY pin indicates the device's operational status. It is driven low when the device is busy with internal self-timed operations like programming or erasing, and high when ready to accept new commands.