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Features
• Single 2.5V - 3.6V or 2.7V - 3.6V Supply
• Serial Peripheral Interface (SPI) Compatible
• 20 MHz Max Clock Frequency
• Page Program Operation
¨C Single Cycle Reprogram (Erase and Program)
¨C 2048 Pages (264 Bytes/Page) Main Memory
• Supports Page and Block Erase Operations
• Two 264-byte SRAM Data Buffers ¨C Allows Receiving of Data
while Reprogramming the Flash Memory Array
• Continuous Read Capability through Entire Array
¨C Ideal for Code Shadowing Applications
• Low Power Dissipation
¨C 4 mA Active Read Current Typical
¨C 2 ¦ÌA CMOS Standby Current Typical
• Hardware Data Protection Feature
• 5.0V-tolerant Inputs: SI, SCK, CS, RESET, and WP Pins
• Commercial and Industrial Temperature Ranges
• Green (Pb/Halide-free/RoHS Compliant) Package Options

Description
The AT45DB041B is an SPI compatible serial interface Flash memory ideally suited
for a wide variety of digital voice-, image-, program code- and data-storage applications.
Its 4,325,376 bits of memory are organized as 2048 pages of 264 bytes each. In
addition to the main memory, the AT45DB041B also contains two SRAM data buffers
of 264 bytes each.
The buffers allow receiving of data while a page in the main memory is being reprogrammed,
as well as reading or 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 SPI serial interface
to sequentially access its data. DataFlash supports SPI mode 0 and mode 3. The
simple serial interface facilitates hardware layout, increases system reliability, minimizes
switching noise, and reduces package size and active pin count. 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. The device operates at clock
frequencies up to 20 MHz with a typical active read current consumption of 4 mA.
To allow for simple in-system reprogrammability, the AT45DB041B does not require
high input voltages for programming. The device operates from a single power supply,
2.5V to 3.6V or 2.7V to 3.6V, for both the program and read operations. The
AT45DB041B is enabled through the chip select pin (CS) and accessed via a threewire
interface consisting of the Serial Input (SI), Serial Output (SO), and the Serial
Clock (SCK).
All programming cycles are self-timed, and no separate erase cycle is required before
programming.

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