AT45DB321D-SU.pdf

### AT45DB321D Flash Memory Datasheet Key Points #### 1. **Overview and Technical Specifications** - **Title**: AT45DB321D Flash Memory - **Description**: The AT45DB321D is a 2.7-volt, serial interface sequential access Flash memory device that is well-suited for various digital voice, image, program code, and data storage applications. - **Operating Voltage**: Single 2.7V to 3.6V supply voltage - **Serial Interface**: RapidS™ serial interface with a maximum clock frequency of 66 MHz, compatible with SPI modes 0 and 3. #### 2. **Memory Organization and Page Size Configuration** - **Memory Size**: 34,603,008 bits (32 Mbits) - **Page Size Options**: User-configurable page size options: - 512 bytes per page - 528 bytes per page - Factory pre-configurable for 512 bytes/page. - **Number of Pages**: 8,192 pages (512/528 bytes/page) in the main memory. #### 3. **Programming and Erasing Operations** - **Page Program Operation**: Intelligent programming operation that allows the user to write data to a page. - **Erase Options**: Flexible erase options include: - Page Erase (512 bytes) - Block Erase (4 Kbytes) - Sector Erase (64 Kbytes) - Chip Erase (32 Mbits) #### 4. **Data Buffers and Continuous Read Capability** - **SRAM Data Buffers**: Two SRAM data buffers (512/528 bytes each) allow receiving data while reprogramming the Flash array. - **Continuous Read**: The device supports continuous read capability throughout the entire array, making it ideal for code shadowing applications. #### 5. **Performance Characteristics** - **Power Consumption**: - Active Read Current: Typically 7 mA - Standby Current: Typically 25 μA - Deep Power Down Current: Typically 5 μA - **Endurance**: Minimum 100,000 program/erase cycles per page. - **Data Retention**: 20 years. #### 6. **Security and Data Protection Features** - **Sector Lockdown**: For secure code and data storage, individual sectors can be locked down. - **Security Register**: A 128-byte security register provides an additional layer of protection. - **User-Programmable Space**: A 64-byte space for user-programmable features. - **Device Identifier**: A unique 64-byte device identifier is included. #### 7. **Additional Features** - **EEPROM Emulation**: Supports a self-contained three-step read-modify-write operation for bit or byte alterability, similar to EEPROM functionality. - **Standard IDs**: JEDEC standard manufacturer and device ID read capabilities. - **Temperature Range**: Industrial temperature range support. - **Packaging**: Green (Pb/Halide-free/RoHS compliant) packaging options are available. #### 8. **Technical Details** - The AT45DB321D uses a RapidS serial interface to provide high-speed operations up to 66 MHz, which is compatible with SPI modes 0 and 3. - Unlike conventional Flash memories that use multiple address lines and a parallel interface, the DataFlash memory uses a serial interface for data access. - The device is organized into 8,192 pages of either 512 or 528 bytes each. - The two SRAM buffers enable concurrent data reception and programming, enhancing efficiency and performance. - The sector lockdown feature and security register provide robust security mechanisms for sensitive data storage. - The EEPROM emulation capability simplifies bit or byte-level modifications without the need for complex hardware configurations. - The AT45DB321D is designed to meet industrial temperature requirements, ensuring reliable operation across a wide range of environmental conditions. - The green packaging options make this device suitable for environmentally conscious applications and comply with RoHS regulations. In summary, the AT45DB321D is a highly versatile and efficient Flash memory device designed for a wide range of applications requiring high-speed operations, flexible data management, and robust security features. Its combination of advanced features, low power consumption, and industrial-grade specifications makes it a valuable component for digital systems that demand reliability and performance.