Synchronous FIFO for mid-speed buffering
The Cypress CY7C4231V-15JC is a synchronous FIFO memory in the CY7C series, organized as 2K x 9 bits (18 Kbit total). The 32-PLCC (J-Lead) package is a legacy surface-mount footprint, and the part includes programmable almost-full/almost-empty flags for flow control without external glue logic.
The 66.7 MHz maximum clock rate sets the throughput ceiling at roughly 66.7 million words per second for back-to-back reads or writes. The 11 ns access time is the delay from the rising clock edge to valid data on the output bus.
2K x 9 organization and programmable flags
The 9-bit width (8 data bits plus a parity or control bit) suits applications like 8-bit data paths with an extra flag or ECC bit. The 2K depth provides 2048 storage locations — enough for moderate packet buffering or line-rate matching. Programmable almost-full and almost-empty thresholds let the designer set warning levels that trigger interrupt or DMA handshake signals, reducing processor polling overhead.
No direct replacement is recorded in the Cypress product line. For new designs, a pin-compatible synchronous FIFO from the same family (e.g., a 3.3 V CY7C42xx variant with similar depth/width) may be considered, but the buyer should verify footprint and timing compatibility. Expect to work with a broker or surplus distributor; last-time-buy stock may still be available in limited quantities.
Package and temperature grade — fit for indoor equipment
The 32-PLCC (J-Lead) package (11.43 x 13.97 mm body) is a through-hole-compatible surface-mount footprint that can be socketed or soldered. The supply current maximum is 20 mA, so power dissipation is modest even at full clock rate.