Pre-Production
FM24W256
256Kb Wide Voltage Serial F-RAM
Features
Low Power Operation
256K bit Ferroelectric Nonvolatile RAM
Organized as 32,768 x 8 bits
Wide Voltage Operation 2.7V-5.5V
100 A Active Current (100 kHz)
15 A Standby Current (typ.)
High Endurance 100 Trillion (1014) Read/Writes
38 year Data Retention (@ +75ºC)
NoDelay™ Writes
Industry Standard Configuration
Industrial Temperature -40 C to +85 C
8-pin “Green”/RoHS SOIC Package
Advanced High-Reliability Ferroelectric Process
Fast Two-wire Serial Interface
Up to 1 MHz maximum bus frequency
Direct hardware replacement for EEPROM
Supports legacy timing for 100 kHz & 400 kHz
Description
Pin Configuration
The FM24W256 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
A0
A1
VDD
WP
A2
SCL
SDA
VSS
The FM24W256 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 FM24W256 is capable of
supporting 1014 read/write cycles, or 100 million
times more write cycles than EEPROM.
Pin Names
A0-A2
SDA
SCL
WP
Function
Device Select Address
Serial Data/Address
Serial Clock
Write Protect
Ground
VSS
VDD
Supply Voltage
These capabilities make the FM24W256 ideal for
nonvolatile memory applications requiring frequent
or rapid writes. 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. The
combination of features allows more frequent data
writing with less overhead for the system.
Ordering Information
FM24W256-G
8-pin “Green”/RoHS SOIC
FM24W256-GTR
8-pin “Green”/RoHS SOIC, Tape
& Reel
FM24W256-EG*
FM24W256-EGTR*
8-pin “Green”/RoHS EIAJ SOIC
8-pin “Green”/RoHS EIAJ SOIC,
Tape & Reel
* Not Recommended for New Designs
The FM24W256 provides substantial benefits to
users of serial EEPROM, yet these benefits are
available in a hardware drop-in replacement. The
FM24W256 is available in industry standard 8-pin
SOIC package using a familiar two-wire protocol. It
is guaranteed over an industrial temperature range of
-40°C to +85°C.
This is a product in the pre-production phase of development. Device characterization is complete and Ramtron does not expect to
change the specifications. Ramtron will issue a Product Change Notice if any specification changes are made.
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose, CA 95134-1709
•
408-943-2600
Document Number: 001-84464 Rev. *A
Revised March 07, 2013