【产品介绍】

    The AT45DB321D is a 2.7-volt, serial-interface sequential access Flash memory ideally suited for a wide variety of digital voice-, image-, program code- and data-storage applications. The AT45DB321D supports RapidS serial interface for applications requiring very high speed operations. RapidS serial interface is SPI compatible for frequencies up to 66 MHz. Its 34,603,008 bits of memory are organized as 8,192 pages of 512 bytes or 528 bytes each. In addition to the main memory, the AT45DB321D also contains two SRAM buffers of 512/528 bytes each. The buffers allow the receiving of data while a page in the main Memory is being reprogrammed, as well as writing a continuous data stream. EEPROM emulation (bit or byte alterability) is easily handled with a self-contained three step read-modify-write operation. Unlike conventional Flash memories that are accessed randomly with multiple address lines and a parallel interface, the DataFlash uses a RapidS serial interface to sequentially access its data. The simple sequential access dramatically reduces active pin count, facilitates hardware layout, increases system reliability, minimizes switching noise, and reduces package size. The device is optimized for use in many commercial and industrial applications where high-density, low-pin count, low-voltage and low-power are essential.

Single 2.7V - 3.6V Supply
RapidS™ Serial Interface: 66 MHz Maximum Clock Frequency
   SPI Compatible Modes 0 and 3
User Configurable Page Size
   512 Bytes per Page
   528 Bytes per Page
   Page Size Can Be Factory Pre-configured for 512 Bytes
Page Program Operation
   Intelligent Programming Operation
   8,192 Pages (512/528 Bytes/Page) Main Memory
Flexible Erase Options
   Page Erase (512 Bytes)
   Block Erase (4 Kbytes)
   Sector Erase (64 Kbytes)
   Chip Erase (32 Mbits)
Two SRAM Data Buffers (512/528 Bytes)
   Allows Receiving of Data while Reprogramming the Flash Array
Continuous Read Capability through Entire Array
   Ideal for Code Shadowing Applications
Low-power Dissipation
   7 mA Active Read Current Typical
   25 µA Standby Current Typical
   5 µA Deep Power Down Typical
Hardware and Software Data Protection Features
   Individual Sector
Sector Lockdown for Secure Code and Data Storage
   Individual Sector
Security: 128-byte Security Register
   64-byte User Programmable Space
   Unique 64-byte Device Identifier
JEDEC Standard Manufacturer and Device ID Read
100,000 Program/Erase Cycles Per Page Minimum
Data Retention    20 Years
Industrial Temperature Range
Green (Pb/Halide-free/RoHS Compliant) Packaging Options

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