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FM24C256

256Kb FRAM Serial Memory Features

Low Power Operation 256Kbit Ferroelectric Nonvolatile RAM • 5V Operation • Organized as 32,768 x 8 bits • 200 µ A Active Current (100 kHz) • High Endurance 10 Billion (10
10 ) Read/Writes • 100 µ A Standby Current • 45 year Data Retention • NoDelay™ Writes Industry Standard Configuration • Advanced High-Reliability Ferroelectric Process • Industrial Temperature -40 ° C to +85 ° C • 8-pin “Green”/RoHS EIAJ SOIC Package Fast Two-wire Serial Interface • Up to 1 MHz Maximum Bus Frequency • Supports Legacy Timing for 100 kHz & 400 kHz

Description Pin Configuration

The FM24C256 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. The FM24C256 performs write operations at bus speed. No write delays are incurred. The next bus cycle may commence immediately without the need for data polling. In addition, the product offers write endurance orders of magnitude higher than EEPROM. Also, FRAM 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 FM24C256 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 combination of features allows more frequent data writing with less overhead for the system. The FM24C256 is available in an 8-pin EIAJ SOIC package using an industry standard two-wire protocol. Ramtron’s “green” packages are RoHS compliant. Specifications are guaranteed over an industrial temperature range of -40°C to +85°C.

A0A1 A2VSSVDDWP SCL SDA

12348765 Pin Names Function A0-A2 Device Select Address SDA Serial Data/Address SCL Serial Clock WP Write Protect VSS Ground VDD Supply Voltage 5V

Ordering Information

FM24C256-G “Green”/RoHS 8-pin EIAJ SOIC
This product conforms specifications per the terms of the Ramtron Ramtron International Corporation standard warranty. The product has completed Ramtron’s internal 1850 Ramtron Drive, Colorado Springs, CO 80921 qualification testing and has reached production status. (800) 545-FRAM, (719) 481-7000 http://www.ramtron.com Rev. 3.2 May 2008 Page 1of 12