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Atmel Electronic Components Datasheet

AT26DF321 Datasheet

(AT25DF321 / AT26DF321) 32M-Bit Serial Firmware Dataflash Memory

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Features
Single 2.7V - 3.6V Supply
Serial Peripheral Interface (SPI) Compatible
– Supports SPI Modes 0 and 3
66 MHz Maximum Clock Frequency
Flexible, Uniform Erase Architecture
– 4-Kbyte Blocks
– 32-Kbyte Blocks
– 64-Kbyte Blocks
– Full Chip Erase
Individual Sector Protection with Global Protect/Unprotect Feature
– Sixty-Four 64-Kbyte Physical Sectors
Hardware Controlled Locking of Protected Sectors
Flexible Programming
– Byte/Page Program (1 to 256 Bytes)
Automatic Checking and Reporting of Erase/Program Failures
JEDEC Standard Manufacturer and Device ID Read Methodology
Low Power Dissipation
– 7 mA Active Read Current (Typical)
– 4 µA Deep Power-Down Current (Typical)
Endurance: 100,000 Program/Erase Cycles
Data Retention: 20 Years
Complies with Full Industrial Temperature Range
Industry Standard Green (Pb/Halide-free/RoHS Compliant) Package Options
– 8-lead SOIC (200-mil wide)
– 16-lead SOIC (300-mil wide)
1. Description
The AT26DF321 is a serial interface Flash memory device designed for use in a wide
variety of high-volume consumer based applications in which program code is shad-
owed from Flash memory into embedded or external RAM for execution. The flexible
erase architecture of the AT26DF321, with its erase granularity as small as 4-Kbytes,
makes it ideal for data storage as well, eliminating the need for additional data storage
EEPROM devices.
The physical sectoring and the erase block sizes of the AT26DF321 have been opti-
mized to meet the needs of today's code and data storage applications. By optimizing
the size of the physical sectors and erase blocks, the memory space can be used
much more efficiently. Because certain code modules and data storage segments
must reside by themselves in their own protected sectors, the wasted and unused
memory space that occurs with large sectored and large block erase Flash memory
devices can be greatly reduced. This increased memory space efficiency allows addi-
tional code routines and data storage segments to be added while still maintaining the
same overall device density.
32-megabit
2.7-volt Only
Serial Firmware
DataFlash®
Memory
AT26DF321
For New
Designs Use
AT25DF321
See applicable errata in
Section 17.
3633E–DFLASH–10/07


Atmel Electronic Components Datasheet

AT26DF321 Datasheet

(AT25DF321 / AT26DF321) 32M-Bit Serial Firmware Dataflash Memory

No Preview Available !

www.DataSheet4U.com
The AT26DF321 also offers a sophisticated method for protecting individual sectors against
erroneous or malicious program and erase operations. By providing the ability to individually pro-
tect and unprotect sectors, a system can unprotect a specific sector to modify its contents while
keeping the remaining sectors of the memory array securely protected. This is useful in applica-
tions where program code is patched or updated on a subroutine or module basis, or in
applications where data storage segments need to be modified without running the risk of errant
modifications to the program code segments. In addition to individual sector protection capabili-
ties, the AT26DF321 incorporates Global Protect and Global Unprotect features that allow the
entire memory array to be either protected or unprotected all at once. This reduces overhead
during the manufacturing process since sectors do not have to be unprotected one-by-one prior
to initial programming.
Specifically designed for use in 3-volt systems, the AT26DF321 supports read, program, and
erase operations with a supply voltage range of 2.7V to 3.6V. No separate voltage is required for
programming and erasing.
2. Pin Descriptions and Pinouts
Table 2-1. Pin Descriptions
Symbol
CS
SCK
SI
SO
WP
VCC
GND
Name and Function
CHIP SELECT: Asserting the CS pin selects the device. When the CS pin is deasserted, the
device will be deselected and normally be placed in standby mode (not Deep Power-Down mode),
and the SO pin will be in a high-impedance state. When the device is deselected, data will not be
accepted on the SI pin.
A high-to-low transition on the CS pin is required to start an operation, and a low-to-high transition
is required to end an operation. When ending an internally self-timed operation such as a program
or erase cycle, the device will not enter the standby mode until the completion of the operation.
SERIAL CLOCK: This pin is used to provide a clock to the device and is used to control the flow of
data to and from the device. Command, address, and input data present on the SI pin is always
latched on the rising edge of SCK, while output data on the SO pin is always clocked out on the
falling edge of SCK.
SERIAL INPUT: The SI pin is used to shift data into the device. The SI pin is used for all data input
including command and address sequences. Data on the SI pin is always latched on the rising
edge of SCK.
SERIAL OUTPUT: The SO pin is used to shift data out from the device. Data on the SO pin is
always clocked out on the falling edge of SCK.
WRITE PROTECT: The WP pin controls the hardware locking feature of the device. Please refer to
“Protection Commands and Features” on page 11 for more details on protection features and the
WP pin.
The WP pin is internally pulled-high and may be left floating if hardware controlled protection will
not be used. However, it is recommended that the WP pin also be externally connected to VCC
whenever possible.
DEVICE POWER SUPPLY: The VCC pin is used to supply the source voltage to the device.
Operations at invalid VCC voltages may produce spurious results and should not be attempted.
GROUND: The ground reference for the power supply. GND should be connected to the system
ground.
Asserted
State
Low
Low
Type
Input
Input
Input
Output
Input
Power
Power
2 AT26DF321
3633E–DFLASH–10/07


Part Number AT26DF321
Description (AT25DF321 / AT26DF321) 32M-Bit Serial Firmware Dataflash Memory
Maker ATMEL Corporation
Total Page 30 Pages
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