The Cypress CY7C4261-10JXI is a 144K (16K x 9) synchronous FIFO memory with a 100 MHz clock and 8 ns access time. It is designed for uni-directional buffering in data-path applications where the read and write clocks run synchronously.
At 100 MHz the FIFO supports a sustained data rate of 100 million words per second. The 8 ns access time from the rising clock edge to valid data on the bus sets the setup margin for the receiving device.
Cypress has discontinued production; there is no last-time-buy window open. New designs should not target this part.
Package and handling notes for the 32-PLCC
The 32-LCC (J-Lead) package — supplier device package 32-PLCC (11.43x13.97) — is a legacy surface-mount footprint. J-leads require a reflow profile with a gradual ramp to avoid solder wicking up the lead bend; the PLCC body also traps flux residue, so a post-reflow clean is recommended for high-reliability assemblies. The part ships in Tube (not Tape & Reel), which affects pick-and-place feeder setup.