55 ns access time — timing budget reality
The 55 ns access time is symmetrical for read and write cycles, with the write cycle time also rated at 55 ns. This means the part can sustain a single-cycle read or write every 55 ns, or about 18 MHz bus throughput in a zero-wait-state system. For a dual-port part, the access time also sets the arbitration latency—both ports must respect the same timing when contending for the same address. If your system has a faster bus clock, you will need to insert wait states or look at a faster dual-port SRAM.
68-PLCC package — footprint and rework notes
The 68-PLCC (J-Lead) package has a body size of 24.23 mm x 24.23 mm. J-Lead packages are less common in new designs but are still encountered in legacy telecom and industrial boards. Rework requires a hot-air tool with a PLCC nozzle; the leads are hidden under the package body, so inspection after soldering is visual from the side rather than automated optical.
The CY7C144-55JXCT is marked as Obsolete by the manufacturer. This means the part is no longer in production, and any remaining stock is limited to what exists in distribution channels—new-old-stock or surplus. For a BOM that requires this exact part, the only sourcing path is through independent distributors who hold inventory or can locate it from their networks. There is no factory lead time to rely on.
Temperature grade limits application scope
This part is not rated for industrial (-40°C to 85°C) or automotive environments. If your system sees temperature excursions below freezing or above 70°C ambient, this part is outside its specified range and should not be used without qualification testing.