High-Density 64 kBit SPI F-RAM Memory device | 20MHz, -40 to 85°C, Pure Sn Finish - Ideal for Industrial Applications The FM25CL64B-GTR is a 64-Kbit (8K × 8) serial F-RAM with SPI interface, supporting up to 20 MHz clock and operating from 2.7 V to 3.65 V over –40°C to +85°C. It features 100 trillion read/write cycle endurance, 151-year data retention at 65°C, and NoDelay™ writes at bus speed, eliminating write delays.