參數(shù)資料
型號(hào)： FM25W256-S
廠商： Electronic Theatre Controls, Inc.
英文描述： 256Kb FRAM Wide Voltage Serial Memory
中文描述： 寬電壓的256Kb串行FRAM的記憶
文件頁(yè)數(shù)： 1/13頁(yè)
文件大?。?/td> 165K
代理商： FM25W256-S
Preliminary
FM25W256
256Kb FRAM Wide Voltage Serial Memory
Features
This is a product that has fixed target specifications but are subject
to change pending characterization results.
Rev. 1.0
Aug. 2004
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
www.ramtron.com
Page 1 of 13
256K bit Ferroelectric Nonvolatile RAM
Organized as 32,768 x 8 bits
Unlimited Read/Write Cycles
10 Year Data Retention
NoDelay Writes
Advanced High-Reliability Ferroelectric Process
Very Fast Serial Peripheral Interface - SPI
Up to 25 MHz Frequency
Direct Hardware Replacement for EEPROM
SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Description
The FM25W256 is a 256-kilobit nonvolatile memory
employing an advanced ferroelectric process. A
ferroelectric random access memory or FRAM 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
EEPROM and other nonvolatile memories.
Unlike serial EEPROMs, the FM25W256 performs
write operations at bus speed. No write delays are
incurred. The next bus cycle may commence
immediately without the need for data polling. The
next bus cycle may start immediately. In addition, the
product offers virtually unlimited write endurance.
Also,
FRAM
exhibits
consumption than EEPROM.
These capabilities make the FM25W256 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.
The FM25W256 provides substantial benefits to
users of serial EEPROM as a hardware drop-in
replacement. The FM25W256 uses the high-speed
SPI bus, which enhances the high-speed write
capability
of
FRAM
specifications are guaranteed over an industrial
temperature range of -40°C to +85°C.
Write Protection Scheme
Hardware Protection
Software Protection
Wide Operating Range
Wide Voltage Operation 2.7V – 5.5V
Industry Standard Configurations
Industrial Temperature -40
°
C to +85
°
C
8-pin SOIC (-S)
“Green” 8-pin SOIC (-G)
much
lower
power
technology.
Device
Pin Configuration
Pin Name
/CS
/WP
/HOLD
SCK
SI
SO
VDD
VSS
Function
Chip Select
Write Protect
Hold
Serial Clock
Serial Data Input
Serial Data Output
Supply Voltage (2.7 to 5.5V)
Ground
Ordering Information
FM25W256-S
FM25W256-G
8-pin SOIC
“Green” 8-pin SOIC
CS
SO
WP
VSS
VDD
HOLD
SCK
SI
1
2
3
4
8
7
6
5
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