The CY15B104QN-50SXI is a 4-Mb EXCELON™ LP ferroelectric RAM (F-RAM) organized as 512K × 8, offering virtually unlimited endurance of 10^15 read/write cycles and 151-year data retention at 60°C. Operating from 1.8 V to 3.6 V across –40°C to +85°C, it supports high-speed SPI up to 50 MHz.