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FM25256B-G

製品説明
仕様・特性

FM25256B 256Kb FRAM Serial 5V Memory Features 256K bit Ferroelectric Nonvolatile RAM • Organized as 32,768 x 8 bits • Virtually Unlimited Endurance (1014 Cycles) • 45 Year Data Retention • NoDelay™ Writes • Advanced High-Reliability Ferroelectric Process Write Protection Scheme • Hardware Protection • Software Protection Wide Operating Range • Wide Voltage Operation 4.0V – 5.5V D E D S N N E G M SI 256 M E W O D 25 C E W t: FM R E en T N cem O R la N O ep F R 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 FM25256B 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 45 years while eliminating the complexities, overhead, and system level reliability problems caused by EEPROM and other nonvolatile memories. Unlike serial EEPROMs, the FM25256B 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 much lower power consumption than EEPROM. These capabilities make the FM25256B 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 FM25256B provides substantial benefits to users of serial EEPROM as a hardware drop-in replacement. The FM25256B 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. 3.2 Nov. 2010 Industry Standard Configurations • Industrial Temperature -40°C to +85°C • 8-pin “Green”/RoHS SOIC (-G) Pin Configuration CS 1 8 VDD SO WP 2 7 3 6 HOLD SCK VSS 4 5 SI 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 (4.0 to 5.5V) Ground Ordering Information FM25256B-G FM25256B-GTR “Green”/RoHS 8-pin SOIC “Green”/RoHS 8-pin SOIC in Tape & Reel Ramtron International Corporation 1850 Ramtron Drive, Colorado Springs, CO 80921 (800) 545-FRAM, (719) 481-7000 http://www.ramtron.com Page 1 of 13

ブランド

RAMTRON

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