AT26DF041 Datasheet, PDF (1/20 Pages) ATMEL Corporation – 4-MEGABIT 3.0-VOLT ONLY OR 2.7-VOLT ONLY SERIAL FIRMWARE DATAFLASH-R

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
1
8
2
7
3
6
4
5
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