What is synchronous SRAM, Types of SRAM, RAM memory, Static RAM

 CY62148E Series 4 Mb (512 K x 8) 5.5 - 5.5 V 55 ns Static RAM-SOIC-32

https://www.futureelectronics.com/p/semiconductors--memory--RAM--static-ram--asynchronous/cy62148ell-55sxi-cypress-7506892