CY14B104NA-ZS45XI is a 4-Mbit nvSRAM organized as 256K × 16, combining fast SRAM with QuantumTrap nonvolatile storage. It runs from 2.7 V to 3.6 V and supports hands-off AutoStore on power-down and RECALL on power-up, with software or pin-initiated STORE/RECALL. Rated for 45 ns access, 1 million STORE cycles, and 20-year data retention in a 44-pin TSOP II industrial grade (-40°C to 85°C).