This document introduces Atmel's DataFlash series, a Flash memory designed for data and code storage applications using NOR technology. It offers small page sizes, providing system designers with flexibility and simplifying data modifications. DataFlash also features a simple serial interface, facilitating hardware layout, increasing system reliability, and minimizing switching noise. It is well-suited for digital voice, image, code, and data storage applications, especially where low power consumption is required.
The document introduces Atmel’s DataFlash family and focuses on the AT45DB041B device, highlighting its small 264‑byte page size, dual serial/parallel interfaces, and suitability for voice, image, code and data storage applications. It describes the internal architecture, including the flash array, two on‑chip buffers and a simple SPI‑compatible serial interface.
Technical details cover the serial interface pinout, supported SPI modes (0 and 3), command set, status register operation, system considerations such as signal integrity and power requirements, and recommended external components. The note concludes with a summary of the DataFlash’s advantages for designers handling frequently changing non‑volatile data.
| Page size | 264 bytes |
|---|---|
| Number of pages | 2048 |
| Total density | 4,325,376 bits |
| Maximum bus speed | 20 MHz |
| Number of active pins | 4 |
| Supported SPI modes | 0 and 3 |
Each page contains 264 bytes.
The device uses four active pins.
It supports SPI modes 0 and 3.