CY14C512PA CY14B512PA CY14E512PA 512-Kbit (64 K .
Cypress Semiconductor
CY14B512PA - 512-Kbit (64 K x 8) SPI nvSRAM
CY14C512PA CY14B512PA CY14E512PA 512-Kbit (64 K × 8) SPI nvSRAM with Real Time Clock 512-Kbit (64 K × 8) SPI nvSRAM with Real Time Clock Features 51.