Synchronous FIFO for 5 V datapath buffering
The part supports retransmit capability and programmable flags, making it suited for buffering in 5 V DSP or ASIC datapaths where bus turnaround and flow control are critical.
66.7 MHz clock and 10 ns access — timing budget fit
At 66.7 MHz the FIFO delivers a 15 ns cycle period, and the 10 ns access time leaves 5 ns for clock-to-output plus board trace delay before the next rising edge. That margin is tight but workable in a single-clock-domain 5 V system with matched-length traces. If the host controller runs at a lower frequency, the FIFO still idles cleanly — no minimum clock rate is specified, so it can be strobed asynchronously within the cycle time.
The CY7C4235-15AC is listed as obsolete. No official replacement part number is provided in the available records. Buyers should verify stock position and lead time before committing the BOM line.
2K x 18 organization — buffer sizing and bus width
The 2K depth and 18-bit width suit applications that need to buffer 16-bit data plus two control/parity bits, or two 9-bit bytes per word. Depth expansion is supported via cascading, and width expansion is possible by paralleling multiple devices. The 36K total capacity handles moderate packet buffering in telecom line cards or industrial frame grabbers.
It is not specified for industrial or automotive extended-temperature ranges.