Preliminary
FM25L04B
4Kb Serial 3V F-RAM Memory
Features
Sophisticated Write Protection Scheme
4K bit Ferroelectric Nonvolatile RAM
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Hardware Protection
Software Protection
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Organized as 512 x 8 bits
High Endurance 100 Trillion (1014) Read/Writes
38 Year Data Retention (
NoDelay™ Writes
Advanced High-Reliability Ferroelectric Process
@ +75ºC)
Low Power Consumption
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Low Voltage Operation 2.7-3.6V
200 µA Active Current (1 MHz)
3 µA (typ.) Standby Current
Very Fast Serial Peripheral Interface - SPI
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Up to 20 MHz Frequency
Direct Hardware Replacement for EEPROM
SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Industry Standard Configuration
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Industrial Temperature -40°C to +85°C
8-pin “Green”/RoHS SOIC and TDFN Packages
Description
Pin Configuration
The FM25L04B is a 4-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
8
7
6
5
CS
VDD
HOLD
SCK
SI
2
SO
3
WP
4
VSS
Top View
The FM25L04B performs write operations at bus
speed. No write delays are incurred. Data is written to
the memory array immediately after each byte has
been transferred to the device. The next bus cycle
may commence without the need for data polling.
The FM25L04B is capable of supporting 1014
read/write cycles, or a million times more write
cycles than EEPROM.
1
2
3
4
8
7
6
5
VDD
/CS
SO
/WP
VSS
/HOLD
SCK
SI
Pin Name
/CS
Function
Chip Select
Write Protect
Hold
These capabilities make the FM25L04B 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.
/WP
/HOLD
SCK
SI
SO
VDD
VSS
Serial Clock
Serial Data Input
Serial Data Output
Supply Voltage
Ground
The FM25L04B provides substantial benefits to users
Ordering Information
of serial EEPROM as
a
hardware drop-in
FM25L04B-G
“Green”/RoHS 8-pin SOIC
“Green”/RoHS 8-pin SOIC,
Tape & Reel
replacement. The FM25L04B uses the high-speed
SPI bus, which enhances the high-speed write
FM25L04B-GTR
capability
of
F-RAM
technology.
Device
FM25L04B-DG
“Green”/RoHS 8-pin TDFN
specifications are guaranteed over an industrial
temperature range of -40°C to +85°C.
FM25L04B-DGTR “Green”/RoHS 8-pin TDFN,
Tape & Reel
This is a product that has fixed target specifications but are subject
to change pending characterization results.
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-F-RAM, (719) 481-7000
www.ramtron.com
Rev. 1.3
Feb. 2011
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