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Atmel Electronic Components Datasheet

AT26DF041 Datasheet

SERIAL FIRMWARE DATAFLASH-R

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Features
Single 3.0V - 3.6V or 2.7V - 3.6V Supply
Serial Peripheral Interface (SPI) Compatible
33 MHz Max Clock Frequency
Byte Program Operation
Page Program Operation
– 2048 Pages (256 Bytes/Page) Main Memory
– Single Cycle Reprogram Capability (Page Erase and Program)
Supports Optional Page and Block (2 KB or 4 KB) Erase Operations
Continuous Read Capability through Entire Array
– Ideal for Code Shadowing Applications
Hardware Data Protection Feature for the Top 64 KB of Memory
Low Power Dissipation
– 4 mA Active Read Current Typical
– 2 µA CMOS Standby Current Typical
5.0V-tolerant Inputs: SI, SCK, CS, and WP Pins
100,000 Program/Erase Cycles Typical
Data Retention – 20 years
4-megabit
3.0-volt Only or
2.7-volt Only
Serial Firmware
DataFlash®
1. Description
The AT26DF041 is a 3.0-volt or 2.7-volt only, serial interface Flash memory ideally
suited for a wide variety of program code- and data-storage applications. Its 4,194,304
bits of memory are organized as 2048 pages of 256 bytes each. Unlike conventional
Flash memories that are accessed randomly with multiple address lines and a parallel
interface, the DataFlash® uses an SPI serial interface to sequentially access its data.
The DataFlash supports SPI mode 0 and mode 3. The simple serial interface facili-
tates 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. To allow for simple in-system reprogrammability, the
AT26DF041 does not require high input voltages for programming. The device oper-
ates from a single power supply, 3.0V to 3.6V or 2.7V to 3.6V, for both the program
and read operations. The AT26DF041 is enabled through the chip select pin (CS) and
accessed via a three-wire interface consisting of the Serial Input (SI), Serial Output
(SO), and the Serial Clock (SCK).
AT26DF041
Table 1-1.
Pin Name
CS
SCK
SI
SO
WP
Pin Configurations
Function
Chip Select
Serial Clock
Serial Input
Serial Output
CS
SO
WP
GND
8-SOIC
18
27
36
45
8-MLF Top View
VCC
NC
SCK
SI
CS 1
SO 2
WP 3
GND 4
8 VCC
7 NC
6 SCK
5 SI
Hardware Write
Protect Pin
3495B–DFLSH–8/05


Atmel Electronic Components Datasheet

AT26DF041 Datasheet

SERIAL FIRMWARE DATAFLASH-R

No Preview Available !

To allow for simple in-system reprogrammability, the AT26DF041 does not require high input
voltages for programming. The device operates from a single power supply, 3.0V to 3.6V or
2.7V to 3.6V, for both the program and read operations. The AT26DF041 is enabled through
the chip select pin (CS) and accessed via a three-wire interface consisting of the Serial Input
(SI), Serial Output (SO), and the Serial Clock (SCK).
All program and erase cycles are self-timed, and no separate erase cycle is required when
using the Page Program with Auto-Erase feature.
2. Block Diagram
WP
WP
LOGIC
STATUS
REGISTER
FLASH MEMORY ARRAY
PAGE (256 BYTES)
BUFFER (256 BYTES)
SCK
CS
VCC
GND
I/O INTERFACE
SI SO
3. Memory Array
To provide optimal flexibility, the memory array of the AT26DF041 is divided into three levels
of granularity comprising of sectors, blocks, and pages. The Memory Architecture Diagram
illustrates the breakdown of each level and details the number of pages per sector and block.
All program operations to the DataFlash occur either on a byte basis or on a page-by-page
basis; however, the optional erase operations can be performed at the block or page level.
2 AT26DF041
3495B–DFLSH–8/05


Part Number AT26DF041
Description SERIAL FIRMWARE DATAFLASH-R
Maker ATMEL Corporation
Total Page 20 Pages
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