15 ns access time — what it means for the bus
The CY7C1041BNV33L-15ZXC: The 15 ns access time on this 4 Mbit asynchronous SRAM means the part can complete a random read or write cycle in 15 ns.
Obsolete — sourcing reality
256K x 16 organization — fit check
The 256K x 16 organization (4 Mbit total) is a standard density for 16-bit-wide data buses in older embedded systems — think TI TMS320C54x DSPs, PowerQUICC II network processors, or Xilinx Spartan-II FPGA block RAM expansion. The 44-TSOP II footprint is common across multiple vendors, so a board designed for this part can often accept an ISSI or Alliance Memory equivalent with no layout change, provided the timing and supply match.
0°C to 70°C — indoor only
The commercial temperature range (0°C to 70°C) limits this part to indoor, temperature-controlled environments — office equipment, telecom central-office racks, or benchtop instrumentation. Not rated for industrial enclosures, outdoor cabinets, or automotive under-hood.