FM25W256
256Kb Wide Voltage SPI F-RAM
Features
Write Protection Scheme
Hardware Protection
Software Protection
256K bit Ferroelectric Nonvolatile RAM
Organized as 32,768 x 8 bits
High Endurance 100 Trillion (1014) Read/Writes
38 Year Data Retention (@ +75ºC)
NoDelay™ Writes
Low Power Operation
Wide Voltage Operation 2.7V – 5.5V
15 µA (typ.) Standby Current
Advanced High-Reliability Ferroelectric Process
Very Fast Serial Peripheral Interface - SPI
Up to 20 MHz Frequency
Industry Standard Configurations
Industrial Temperature -40 C to +85 C
8-pin “Green”/RoHS SOIC (-G)
Direct Hardware Replacement for EEPROM
SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Description
Pin Configuration
The FM25W256 is a 256-kilobit nonvolatile memory
employing an advanced ferroelectric process. A
ferroelectric random access memory or F-RAM is
nonvolatile and performs reads and writes like a
RAM. It provides reliable data retention for 38 years
while eliminating the complexities, overhead, and
system level reliability problems caused by
EEPROM and other nonvolatile memories.
1
2
3
4
8
7
6
5
CS
SO
VDD
HOLD
SCK
SI
WP
VSS
The FM25W256 performs write operations at bus
speed. No write delays are incurred. Data is written to
the memory array immediately after it has been
successfully transferred to the device. The next bus
cycle may commence immediately without the need
for data polling. In addition, the product offers
substantial write endurance compared with other
nonvolatile memories. The FM25W256 is capable of
supporting 1014 read/write cycles, or 100 million
times more write cycles than EEPROM.
Pin Name
/CS
/WP
/HOLD
SCK
SI
Function
Chip Select
Write Protect
Hold
Serial Clock
Serial Data Input
Serial Data Output
SO
VDD
VSS
Supply Voltage (2.7 to 5.5V)
Ground
These capabilities make the FM25W256 ideal for
nonvolatile memory applications requiring frequent
or rapid writes or low power operation. Examples
range from data collection, where the number of
write cycles may be critical, to demanding industrial
controls where the long write time of EEPROM can
cause data loss.
Ordering Information
FM25W256-G
FM25W256-GTR “Green”/RoHS 8-pin SOIC,
“Green”/RoHS 8-pin SOIC
Tape & Reel
The FM25W256 provides substantial benefits to
users of serial EEPROM as a hardware drop-in
replacement. The FM25W256 uses the high-speed
SPI bus, which enhances the high-speed write
capability
of
F-RAM
technology.
Device
specifications are guaranteed over an industrial
temperature range of -40°C to +85°C.
This product conforms to specifications per the terms of the Ramtron standard warranty. The product has completed Ramtron’s
internal qualification testing and has reached production status.
Cypress Semiconductor Corporation
Document Number: 001-84506 Rev. **
•
198 Champion Court
•
San Jose, CA 95134-1709
•
408-943-2600
Revised February 25, 2013
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