Features

Single 2.3V - 3.6V supply

Serial Peripheral Interface (SPI) compatible

Supports SPI modes 0 and 3

Supports RapidS™ operation

Continuous read capability through entire array

Up to 85MHz

Low-power read option up to 15MHz

Clock-to-output time (tV
) of 6ns maximum

User configurable page size

512 bytes per page

528 bytes per page (default)

Page size can be factory pre-configured for 512 bytes

Two fully independent SRAM data buffers (512/528 bytes)

Flexible programming options

Byte/Page Program (1 to 512/528 bytes) directly into main memory

Buffer Write

Buffer to Main Memory Page Program

Flexible erase options

Page Erase (512/528 bytes)

Block Erase (4 KB)

Sector Erase (64 KB)

Chip Erase (32 Mbits)

Program and Erase Suspend/Resume

Advanced hardware and software data protection features

Individual sector protection

Individual sector lock-down to make any sector permanently read-only

128-byte, One-Time Programmable (OTP) Security Register

64 bytes factory programmed with a unique identifier

64 bytes user programmable

Hardware and software controlled reset options

JEDEC Standard Manufacturer and Device ID Read

Low-power dissipation

400nA Ultra-Deep Power-Down current (typical)

3µA Deep Power-Down current (typical)

25µA Standby current (typical)

7mA Active Read current (typical)

Endurance: 100,000 program/erase cycles per page minimum

Data retention: 20 years

Green (Pb/Halide-free/RoHS compliant) packaging options

8-lead SOIC (0.208" wide)

8-pad Ultra-thin DFN (5 x 6 x 0.6mm)

Die in Wafer Form

Description
The Adesto®
AT45DB321E is a 2.3V minimum, serial-interface sequential access Flash memory ideally suited for a wide
variety of digital voice, image, program code, and data storage applications. The AT45DB321E also supports the RapidS
serial interface for applications requiring very high speed operation. 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 AT45DB321E also contains two SRAM
buffers of 512/528 bytes each. The buffers allow receiving of data while a page in the main memory is being
reprogrammed. Interleaving between both buffers can dramatically increase a system's ability to write a continuous data
stream. In addition, the SRAM buffers can be used as additional system scratch pad memory, and E2PROM emulation
(bit or byte alterability) can be 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
Adesto DataFlash®
uses a serial interface to sequentially access its data. The simple sequential access dramatically
reduces active pin count, facilitates simplified 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.
To allow for simple in-system re-programmability, the AT45DB321E does not require high input voltages for
programming. The device operates from a single 2.3V to 3.6V power supply for the erase and program and read
operations. The AT45DB321E is enabled through the Chip Select pin (CS) and accessed via a 3-wire interface consisting
of the Serial Input (SI), Serial Output (SO), and the Serial Clock (SCK).
All programming and erase cycles are self-timed.