The CY15B104QN-20BFXI is a 4-Mb EXCELON™ LP ferroelectric RAM (F-RAM) providing nonvolatile storage with virtually unlimited endurance of 1e15 read/write cycles and 151-year data retention. It features a high-speed SPI interface up to 50 MHz, operates from 1.8 V to 3.6 V, and supports industrial temperatures from –40°C to +85°C.