Features
• Single 2.7V to 3.6V Supply
• RapidS Serial Interface: 66MHz Maximum Clock Frequency
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– SPI Compatible Modes 0 and 3
User Configurable Page Size
– 256-Bytes per Page
– 264-Bytes per Page
– Page Size Can Be Factory Pre-configured for 256-Bytes
Page Program Operation
– Intelligent Programming Operation
– 1,024 Pages (256/264-Bytes/Page) Main Memory
Flexible Erase Options
– Page Erase (256-Bytes)
– Block Erase (2-Kbytes)
– Sector Erase (32-Kbytes)
– Chip Erase (2-Mbits)
One SRAM Data Buffer (256/264-Bytes)
Continuous Read Capability through Entire Array
– Ideal for Code Shadowing Applications
Low-power Dissipation
– 7mA Active Read Current Typical
– 25µA Standby Current Typical
– 15µA 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
2-megabit
2.7V Minimum
DataFlash
Atmel AT45DB021D
Description
The Atmel® AT45DB021D is a 2.7V, serial-interface Flash memory ideally suited for a
wide variety of digital voice-, image-, program code- and data-storage applications.
The Atmel AT45DB021D supports Atmel RapidS™ serial interface for applications
requiring very high speed operations. RapidS serial interface is SPI compatible for frequencies up to 66MHz. Its 2-,162-,688-bits of memory are organized as 1,024-pages
of 256-bytes or 264-bytes each. In addition to the main memory, the AT45DB021D
also contains one SRAM buffer of 256-/264-bytes. 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 Atmel 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.
Atmel RapidS
3638J–DFLASH–5/10
