Volatile memory, Random Access Memory, Computer memory, battery backed SRAM

 CY62148EV30 Series 4 Mb (512 K x 8) 3 V 45 ns CMOS SRAM - TSOP II-32

https://www.futureelectronics.com/p/semiconductors--memory--RAM--static-ram--asynchronous/cy62148ev30ll-45zsxi-infineon-5338926