at26df041 ATMEL Corporation, at26df041 Datasheet - Page 2

• Manufacturer Part Number: at26df041
• Description: 4-megabit 3.0-volt Only Or 2.7-volt Only Serial Firmware Dataflash At26df041 For New Designs Use At26f004
• Manufacturer: ATMEL Corporation

2. Block Diagram
3. Memory Array
2
AT26DF041
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.
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.
GND
VCC
SCK
WP
CS
REGISTER
STATUS
LOGIC
WP
PAGE (256 BYTES)
FLASH MEMORY ARRAY
SI
BUFFER (256 BYTES)
I/O INTERFACE
SO
3495C–DFLSH–11/05