Synchronous ram, sram devices, sram devices, Static RAM, semiconductor memory

 AS6C4008 Series 4-Mbit (512 K x 8) 3 V 55 ns CMOS Static RAM - SOIC-32

https://www.futureelectronics.com/p/semiconductors--memory--RAM--static-ram--asynchronous/as6c4008-55sin-alliance-memory-2652931