NON volatile SRAM, non volatile SRAM types, Ram digital, High speed SRAM

 M24C02 Series 2 Kb (256 x 8) 2.5 V SMT Serial I²C Bus EEPROM - SOIC-8

https://www.futureelectronics.com/p/semiconductors--memory--RAM--nvram--quantum-trap-nvsram/m24c02-wmn6p-stmicroelectronics-4434775