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AT25DF321-S3U Datasheet(PDF) 4 Page - ATMEL Corporation

Part # AT25DF321-S3U
Description  32-megabit 2.7-volt Only Serial Firmware DataFlash Memory
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT25DF321-S3U Datasheet(HTML) 4 Page - ATMEL Corporation

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4
3669A–DFLASH–07/07
AT25DF321
3.
Block Diagram
4.
Memory Array
To provide the greatest flexibility, the memory array of the AT25DF321 can be erased in four lev-
els of granularity including a full chip erase. In addition, the array has been divided into physical
sectors of uniform size, of which each sector can be individually protected from program and
erase operations. The size of the physical sectors is optimized for both code and data storage
applications, allowing both code and data segments to reside in their own isolated
regions. Figure 4-1 on page 5 illustrates the breakdown of each erase level as well as the break-
down of each physical sector.
Figure 2-1.
8-SOIC Top View
Figure 2-2.
16-SOIC Top View
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
HOLD
VCC
NC
NC
NC
NC
CS
SO
SCK
SI
NC
NC
NC
NC
GND
WP
FLASH
MEMORY
ARRAY
Y-GATING
CS
SCK
SO
SI
Y-DECODER
X-DECODER
I/O BUFFERS
AND LATCHES
CONTROL AND
PROTECTION LOGIC
SRAM
DATA BUFFER
WP
INTERFACE
CONTROL
AND
LOGIC
HOLD


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