FM25040A Datasheet, PDF (1/13 Pages) Ramtron International Corporation – 4Kb FRAM Serial Memory

FM25040A
4Kb FRAM Serial Memory
Features
4K bit Ferroelectric Nonvolatile RAM
• Organized as 512 x 8 bits
• High Endurance 1 Trillion (10¹²) Read/Writes
• 45 year Data Retention
• NoDelay™ Writes
• Advanced High-Reliability Ferroelectric Process
Very Fast Serial Peripheral Interface - SPI
• Up to 20 MHz maximum Bus Frequency
• Direct hardware replacement for EEPROM
• SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Description
The FM25040A is a 4-kilobit nonvolatile memory
employing an advanced ferroelectric process. A
ferroelectric random access memory or FRAM is
nonvolatile but operates in other respects as 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 FM25040A performs
write operations at bus speed. No write delays are
incurred. Data is written to the memory array in the
cycle 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 FM25040A is capable of supporting
up to 10¹² read/write cycles -- far more than most
systems will require from a serial memory.
These capabilities make the FM25040A 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 FM25040A provides substantial benefits to users
of serial EEPROM, in a hardware drop-in
replacement. The FM25040A uses the high-speed
SPI bus which enhances the high-speed write
capability of FRAM 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. 3.0
May 2006
Sophisticated Write Protection Scheme
• Hardware Protection
• Software Protection
Low Power Consumption
• 10 µA Standby Current
Industry Standard Configuration
• Industrial Temperature -40° C to +85° C
• 8-pin SOIC (-S)
• “Green” 8-pin SOIC (-G)
Pin Configuration
CS
1
SO
2
WP
3
VSS
4
8
VDD
7
HOLD
6
SCK
5
SI
Pin Names
/CS
/WP
/HOLD
SCK
SI
SO
VDD
VSS
Function
Chip Select
Write Protect
Hold
Serial Clock
Serial Data Input
Serial Data Output
Supply Voltage 5V
Ground
Ordering Information
FM25040A-S 8-pin SOIC
FM25040A-G “Green” 8-pin SOIC
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, [phone]
www.ramtron.com
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