at45db041a-cc ATMEL Corporation, at45db041a-cc Datasheet - Page 2

• Manufacturer Part Number: at45db041a-cc
• Description: At45db041a 4-megabit 2.5-volt Only Serial Dataflash
• Manufacturer: ATMEL Corporation

memories that are accessed randomly with multiple
address lines and a parallel interface, the DataFlash uses a
serial interface to sequentially access its data. The simple
serial interface facilitates hardware layout, increases sys-
tem 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. Typical applications for the DataFlash
are digital voice storage, image storage, and data storage.
The device operates at clock frequencies up to 13 MHz
with a typical active read current consumption of 4 mA.
Block Diagram
Memory Array
To provide optimal flexibility, the memory array of the
AT45DB041A is divided into three levels of granularity
comprising of sectors, blocks, and pages. The Memory
Architecture Diagram illustrates the breakdown of each
2
RDY/BUSY
AT45DB041A
RESET
GND
VCC
SCK
WP
CS
PAGE (264 BYTES)
BUFFER 1 (264 BYTES)
SI
FLASH MEMORY ARRAY
I/O INTERFACE
To allow for simple in-system reprogrammability, the
AT45DB041A does not require high input voltages for pro-
gramming. The device operates from a single power
supply, 2.5V to 3.0V or 2.7V to 3.6V, for both the program
and read operations. The AT45DB041A 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 programming cycles are self-timed, and no separate
erase cycle is required before programming.
level and details the number of pages per sector and block.
All program operations to the DataFlash occur on a page-
by-page basis; however, the optional erase operations can
be performed at the block or page level.
BUFFER 2 (264 BYTES)
SO