The CY7C1318BV18-278BZC is a Cypress (now Infineon) 18 Mbit synchronous DDR II SRAM organized as 1M×18. Its 278 MHz clock rate means the memory can deliver back-to-back read/write transactions every clock edge — double data rate on both address and data buses — which is exactly what network packet buffers, telecom line cards, and high-end test equipment need to keep pipeline stages fed without wait states.
Supply rails and temperature — design-in constraints
Housed in a 165-LBGA (13×15 mm FBGA), this is a fine-pitch BGA. No socket, no hand-solder field swap — it needs a reflow profile, X-ray inspection, and a board designed for the footprint. Keep the moisture sensitivity level in mind if the tray has been open.
This part is officially obsolete per the Cypress/Infineon lifecycle record. There is no listed direct replacement from the manufacturer, so new-production allocations are gone. Sourcing is through independent distribution and surplus channels — last-time-buy stock that has already shipped, or broker inventory. No factory lead time applies.