SA25F020 Advanced Information
SAIFUN
2
General Description
The SA25F020 is a 2Mb (512K X 4) CMOS
non-volatile serial Flash Memory. This
device fully conforms to the SPI 4-wire
protocol, is enabled through the Chip Select
(CSb) pin, and uses Clock (SCK), Data-in
(SI)
and
Data-out
(SO)
pins
to
synchronously
control
data
transfer
between the SPI microcontroller and the
Serial FLASH memory.
The memory can be programmed from 1 up
to 256 bytes at a time via the Page
Program (PP) instruction.
The memory is organized into four sectors.
Each sector contains 256 pages, with each
page being 256 bytes wide. The entire
memory can therefore be viewed as
consisting of 1024 pages, or 262,144 bytes.
The memory can be erased in one of the
following ways:
•= 256 bytes at a time, using the Page
Erase (PE) instruction
•= 512 Kb at a time, using the Sector
Erase (SE) instruction
•= 2 Mb at a time, using the Bulk
Erase (BE) instruction
Each device requires only a 3.0V power
supply (2.7 V to 3.6 V) for both read and
write functions. Internally generated and
regulated voltages are provided for the
program
and
erase
operations.
The
SA25F020 does not require a VPP supply.
The HOLDb pin may be used to suspend
any serial communication without resetting
the serial sequence. In addition, the serial
interface
allows
a
minimal-pin-count
packaging designed to simplify PC board
layout requirements and offers the designer
a variety of low-voltage and low-power
options.
The
SA25F020
is
available
in
a
space-saving, 8-lead narrow SOIC package
The SA25F020 is part of the SPI Flash and
EEPROM family. It is designed to work with
any
SPI-compatible,
high-speed
microcontroller, and offers both hardware
(WPb pin) and Software (“block protect”)
data protection. For example, programming
a 2-bit code into the status register prevents
program with top ¼, top ½ or entire array
write protection and enables block write
protection. Separate program enable and
program disable instructions are provided
for additional data protection. Hardware
data protection is provided via the WPb pin
to protect against inadvertent write attempts
to the status register.
Saifun’s SPI Serial Flash products are
designed and tested for applications
requiring high endurance and low power
consumption for a continuously reliable
non-volatile solution for all markets.
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