AT45DB321D-MU-SL955

Memory IC Overview

The AT45DB321D-MU-SL955 is a 32Mbit serial flash memory IC manufactured by Renesas Electronics Corporation. It utilizes an SPI-compatible RapidS interface with a maximum clock frequency of 66MHz. The device features a main memory array organized into 8,192 pages of 512 bytes each and includes two SRAM data buffers for flexible read/write operations. It operates on a single power supply ranging from 2.7V to 3.6V and supports industrial temperature ranges from -40°C to +85°C. The component is housed in an 8-VDFN (6x5) package.

Memory IC Feature Summary

• Supports high-speed sequential access via SPI compatible modes 0 and 3 up to 66MHz
• Includes dual SRAM buffers allowing data reception while reprogramming the flash array
• Offers flexible erase options including page, block, sector, and chip erase capabilities
• Provides hardware and software data protection with sector lockdown and security registers

Memory IC Applications

• Digital voice storage applications
• Image data storage systems
• Program code shadowing
• General data-storage solutions

Memory IC Procurement Notes

Verify component authenticity through authorized distributors as this part number is marked as obsolete. Confirm that the specific ordering suffix matches the required package type and environmental compliance standards. Check for valid replacement parts such as the AT45DB321E series if current production availability is required for new designs.

Memory IC Selection Notes

Select this component for applications requiring low pin count and simple hardware layout due to its serial interface. Ensure the system voltage aligns with the 2.7V to 3.6V operating range. Consider the dual buffer architecture if continuous data streaming or efficient data logging is necessary. Verify that the 8-VDFN package dimensions fit the PCB footprint constraints.

Memory IC Part Context

This device belongs to the Atmel DataFlash family, which uses a serial interface for sequential data access rather than random parallel access. This architecture reduces switching noise and package size. The AT45DB321D specifically targets commercial and industrial environments where low voltage operation and high density are essential requirements for embedded memory solutions.

Memory IC Replacement Considerations

Direct substitutes include the AT45DB321E-MHF2B-T and AT45DB321E-MWHF2B-T. These newer variants offer improved speed and extended longevity but may require firmware adjustments due to potential command set differences.