View fm1808 datasheet:

FM1808 256Kb Bytewide FRAM Memory Features SRAM & EEPROM Compatible 256Kbit Ferroelectric Nonvolatile RAM • JEDEC 32Kx8 SRAM & EEPROM pinout • Organized as 32,768 x 8 bits • 70 ns Access Time • High Endurance 10 Billion (1010) Read/Writes • 130 ns Cycle Time • 10 year Data Retention • NoDelay™ Writes Low Power Operation • Advanced High-Reliability Ferroelectric Process • 25 mA Active Current • 20 µA Standby Current Superior to BBSRAM Modules • No Battery Concerns Industry Standard Configuration • Monolithic Reliability • Industrial Temperature -40° C to +85° C • True Surface Mount Solution, No Rework Steps • 28-pin SOIC or DIP • Superior for Moisture, Shock, and Vibration • Resistant to Negative Voltage Undershoots Description Pin Config