FM25V20
2Mb Serial 3V F-RAM Memory
Features
2M bit Ferroelectric Nonvolatile RAM
Organized as 256K x 8 bits
High Endurance 100 Trillion (1014) Read/Writes
10 Year Data Retention
NoDelay™ Writes
Advanced High-Reliability Ferroelectric Process
Very Fast Serial Peripheral Interface - SPI
Up to 40 MHz Frequency
Direct Hardware Replacement for Serial Flash
SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Write Protection Scheme
Hardware Protection
Software Protection
Description
The FM25V20 is a 2-megabit 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 10 years
while eliminating the complexities, overhead, and
system level reliability problems caused by Serial
Flash and other nonvolatile memories.
Device ID
Device ID reads out Manufacturer ID & Part ID
Low Voltage, Low Power
Low Voltage Operation 2.0V – 3.6V
100 A Standby Current (typ.)
3 A Sleep Mode Current (typ.)
Industry Standard Configurations
Industrial Temperature -40C to +85C
8-pin “Green”/RoHS EIAJ SOIC Package
8-pin “Green”/RoHS TDFN Package
8-pin “Green”/POHS PDIP Package
Device ID that allows the host to determine the
manufacturer, product density, and product revision.
The device is guaranteed over an industrial
temperature range of -40°C to +85°C.
Pin Configuration
Top View
/S
These capabilities make the FM25V20 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 controls
where the long write time of Serial Flash can cause
data loss.
The FM25V20 provides substantial benefits to users
of Serial Flash as a hardware drop-in replacement.
The device uses the high-speed SPI bus, which
enhances the high-speed write capability of F-RAM
technology. The device incorporates a read-only
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.
Rev. 3.0
August 2012
8
VDD
2
7
/HOLD
/W
3
6
C
VSS
Unlike Serial Flash, the FM25V20 performs write
operations at bus speed. No write delays are incurred.
Data is written to the memory array immediately
after it has been transferred to the device. The next
bus cycle may commence without the need for data
polling. The product offers very high write
endurance, orders of magnitude more endurance than
Serial Flash. Also, F-RAM exhibits lower power
consumption than Serial Flash.
1
Q
4
5
D
S
1
8
VDD
Q
2
7
HOLD
W
3
6
C
VSS
4
5
D
Pin Name
Function
/S
/W
/HOLD
C
D
Q
VDD
VSS
Chip Select
Write Protect
Hold
Serial Clock
Serial Data Input
Serial Data Output
Supply Voltage
Ground
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
http://www.ramtron.com
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