FM25CL64
64Kb Serial 3V F-RAM Memory
Features
64K bit Ferroelectric Nonvolatile RAM
• Organized as 8,192 x 8 bits
• Unlimited Read/Write Cycles
• 45 Year Data Retention
• NoDelay™ Writes
• Advanced High-Reliability Ferroelectric Process
Sophisticated Write Protection Scheme
• Hardware Protection
• Software Protection
Low Power Consumption
• Low Voltage Operation 2.7-3.65V
• 1 µA Standby Current
D
E
D S
N N
E G
M SI 4B
M E L6
O D 5C
C
2
E W FM
R E ve:
T N ati
O R ern
N O Alt
F
Very Fast Serial Peripheral Interface - SPI
• Up to 20 MHz Frequency
• Direct Hardware Replacement for EEPROM
• SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Description
The FM25CL64 is a 64-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 45 years
while eliminating the complexities, overhead, and
system level reliability problems caused by
EEPROM and other nonvolatile memories.
Unlike serial EEPROMs, the FM25CL64 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. In addition, the
product offers virtually unlimited write endurance,
orders of magnitude more endurance than EEPROM.
F-RAM also exhibits much lower power during
writes than EEPROM since write operations do not
require an internally elevated power supply voltage
for write circuits.
These capabilities make the FM25CL64 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 FM25CL64 provides substantial benefits to users
of serial EEPROM as a hardware drop-in
replacement. The FM25CL64 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.
Rev. 3.5
Feb. 2011
Industry Standard Configuration
• Industrial Temperature -40°C to +85°C
• 8-pin “Green”/RoHS SOIC and TDFN Packages
• Grade 3 AEC-Q100 Qualified (SOIC only)
Pin Configuration
CS
1
8
VDD
SO
2
7
HOLD
WP
3
6
VSS
4
5
SCK
SI
/CS
1
8
VDD
SO
2
7
/HOLD
/WP
3
6
SCK
VSS
4
5
SI
Top View
Pin Name
Function
/CS
/WP
/HOLD
SCK
SI
SO
VDD
VSS
Chip Select
Write Protect
Hold
Serial Clock
Serial Data Input
Serial Data Output
Supply Voltage
Ground
Ordering Information
FM25CL64-G †
FM25CL64-GTR †
“Green” 8-pin SOIC
“Green” 8-pin SOIC,
Tape & Reel
FM25CL64-DG
“Green” 8-pin TDFN
FM25CL64-DGTR
“Green” 8-pin TDFN,
Tape & Reel
FM25CL64-S *
8-pin SOIC
FM25CL64-STR *
8-pin SOIC, Tape & Reel
† Grade 3 AEC-Q100 Qualified
* End of life. Last time buy June 2009.
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
http://www.ramtron.com
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