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AT25SF081-SHD-B Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers

Part # AT25SF081-SHD-B
Description  8-Mbit, 2.5V Minimum SPI Serial Flash Memory with Dual-I/O and Quad-IO Support
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AT25SF081
DS-25SF081A–045B–5/2014
Description
The Adesto® AT25SF081 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 shadowed from Flash memory into embedded or external RAM
for execution. The flexible erase architecture of the AT25SF081 is ideal for data storage as well, eliminating the need for
additional data storage devices.
The erase block sizes of the AT25SF081 have been optimized to meet the needs of today's code and data storage
applications. By optimizing the size of the 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 erase regions, the wasted and
unused memory space that occurs with large block erase Flash memory devices can be greatly reduced. This increased
memory space efficiency allows additional code routines and data storage segments to be added while still maintaining
the same overall device density.
The device also contains three pages of Security Register that can be used for purposes such as unique device
serialization, system-level Electronic Serial Number (ESN) storage, locked key storage, etc. These Security Register
pages can be individually locked.
1.
Pin Descriptions and Pinouts
Table 1-1.
Pin Descriptions
Symbol
Name and Function
Asserted
State
Type
CS
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.
Low
Input
SCK
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 in on the rising edge of SCK, while output data on the SO pin is always
clocked out on the falling edge of SCK.
-
Input
SI (I/O
0)
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 in on
the rising edge of SCK.
With the Dual-Output and Quad-Output Read commands, the SI Pin becomes an output pin
(I/O0) in conjunction with other pins to allow two or four bits of data on (I/O3-0) to be clocked
in on every falling edge of SCK
To maintain consistency with the SPI nomenclature, the SI (I/O
0) pin will be referenced as
the SI pin unless specifically addressing the Dual-I/O and Quad-I/O modes in which case it
will be referenced as I/O0
Data present on the SI pin will be ignored whenever the device is deselected (CS is
deasserted).
-
Input/Output


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