The Infineon CY7C1041G18-15VXI is a 4Mbit asynchronous SRAM organized as 256K x 16 bits. Its 15 ns access time is the ceiling for read or write cycles.
Supply domain: 1.65 V to 2.2 V
This part runs on a 1.65 V to 2.2 V supply rail, which puts it in the low-voltage SRAM class. It is not a 3.3 V part — level shifters are needed if the host controller uses 3.3 V I/O. The 15 ns write cycle time matches the read access, so back-to-back transactions run at the same speed.
The 44-SOJ package (0.400" body width) is a surface-mount footprint that solders into a standard SOJ land pattern. Tube shipment means it arrives in a rigid anti-static tube.