4Mb 3.0V Industrial 108MHz QSPI EXCELON™ F-RAM in 8-pin SOIC The CY15B104QSN-108SXI is a 4-Mbit EXCELON™ Ultra Ferroelectric RAM (F-RAM) with a quad SPI interface, organized as 512K × 8 and supporting up to 108 MHz SDR and 54 MHz DDR operation. It delivers instant non-volatile writes, virtually unlimited endurance of 100 trillion cycles, and 151-year data retention at 65°C.