Alliance Memory SRAM- 4Mbit, Organisation: 256k x 16 bit, Number of Bits per Word: 16bit, Maximum Random Access Time: 55ns, Address Bus Width: 18bit, Low Power: Yes, Timing Type: Asynchronous, Mounting Type: Surface Mount, Package Type: TSOP, Pin Count: 44, Dimensions: 18.6 x 10.3 x 1.05mm, Maximum Operating Supply Voltage: 5.5 V, Length: 18.6mm, MPN: AS6C4016-55ZIN
