AT45DB021B-RC

Memory IC Overview

The AT45DB021B-RC is a 2-megabit serial Flash memory device from the DataFlash family, manufactured by Microchip Technology. It operates on a single 2.7V to 3.6V supply and features a Serial Peripheral Interface (SPI) compatible interface with a maximum clock frequency of 20 MHz. The memory array consists of 1024 pages, each containing 264 bytes. The device includes two 264-byte SRAM data buffers that facilitate continuous data streaming and allow data reception while main memory reprogramming occurs.

Memory IC Feature Summary

• Dual 264-byte SRAM data buffers enable simultaneous data reception and main memory reprogramming for efficient continuous data streaming.
• Supports single-cycle reprogram operations combining erase and program functions within one command sequence.
• Hardware write protection feature allows selective locking of the first 256 pages of the main memory array.
• Continuous read capability across the entire memory array without delays at page boundaries.

Memory IC Applications

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

Memory IC Procurement Notes

Verify the specific suffix RC against official Microchip documentation to confirm package type and temperature range specifications. Confirm current production status as legacy products may have limited availability or end-of-life designations. Ensure compatibility with existing system voltage levels and SPI interface requirements before procurement.

Memory IC Selection Notes

Select this component when a high-density serial Flash solution with integrated SRAM buffers is required for data logging or code execution. The dual-buffer architecture simplifies software development by handling data streams efficiently. Verify that the 20 MHz clock speed and 2.7V minimum operating voltage align with the target system's performance and power constraints.

Memory IC Part Context

The AT45DB021B belongs to the AT45DB series of DataFlash devices, which are designed for low-voltage, low-power applications. This series is characterized by its SPI interface and SRAM buffer architecture, distinguishing it from conventional parallel Flash memories. The device is fully compatible with earlier AT45DB021 and AT45DB021A models, allowing for straightforward upgrades in existing designs.

Memory IC Replacement Considerations

The datasheet explicitly states 100% compatibility with the AT45DB021 and AT45DB021A models. These parts can be considered direct replacements if pinout and electrical characteristics match the specific RC suffix requirements.