Asynchronous sram, Static ram, SRAM memory, Ram digital, SRAM memories,

 23A256 Series 256 Kb (32 K x 8) 20 MHz SPI Bus Low-Power Serial SRAM - TSSOP-8

https://www.futureelectronics.com/p/semiconductors--memory--RAM--static-ram--synchronous/23a256t-i-st-microchip-7084325