The CY7C1049G-10ZSXIT: The 44-TSOP II package (0.400" body width) is the industry-standard footprint for this density class, so a drop-in replacement for an existing 512K x 8 SRAM on the BOM is straightforward, provided the original was also in a 44-TSOP II.
10 ns access time — timing closure on a 5 V bus
For a processor running at 50 MHz to 66 MHz on a synchronous bus, this part leaves enough margin for address decoding, buffer propagation, and PCB trace delay without forcing wait states. If the system uses a 100 MHz or faster bus clock, the 10 ns window starts to pinch — you will need to check the address-to-data setup and hold against the controller's AC timing table.
Because the CY7C1049G-10ZSXIT is in Last Buy status, the primary channel is the factory LTB order. After that window closes, availability will shift to independent distribution and surplus stock. If you have a BOM line that needs filling, send the RFQ and we will check the open-market inventory and factory LTB allocation.