The FM25640B-GTR is a 64-Kbit (8K × 8) serial F-RAM offering nonvolatile memory with high endurance and fast SPI interface. It supports up to 100 trillion read/write cycles and guarantees 151-year data retention at 65°C. Operating from 4.5 V to 5.5 V over -40 to 85°C, it features NoDelay™ writes, hardware and software write protection, and low power consumption. With up to 20 MHz SPI clock speed, it is ideal for frequent-write industrial and control applications.