High-Density 512 kBit SPI F-RAM for Industrial Applications with Wide Operating Range The FM25V05-GTR is a 512-Kbit (64K × 8) serial F-RAM with a high-speed SPI interface up to 40 MHz, providing virtually unlimited endurance of 100 trillion (1e14) read/write cycles and 151-year data retention. Operating from 2.0 V to 3.6 V over –40°C to +85°C, it features low active (0.3 mA at 1 MHz) and standby (90 μA typ) currents, 5 μA sleep mode, and robust hardware and software write protection.