Synchronous FIFO for 66.7 MHz data paths
The Cypress CY7C4265V-15ASC is a synchronous FIFO memory organized 16K x 18, providing 288K bits of buffering with a 66.7 MHz maximum data rate and a 10 ns access time.
10 ns access time — bus timing margin
At a 66.7 MHz clock (15 ns period), a 10 ns access leaves roughly 5 ns of setup margin to the downstream capture flop — workable but tight. If your system clock jitter or PCB trace delay eats into that margin, consider a faster FIFO or add output register stages. This spec is the one to check against your worst-case timing analysis.
The CY7C4265V-15ASC is officially obsolete per the manufacturer's lifecycle record. Cypress (now part of Infineon) no longer produces this device, and no direct replacement order code is listed.
16K x 18 organization and expansion
The 16K x 18 organization means 16,384 words of 18 bits each — the extra two bits per word are typically used for parity or control tags alongside a 16-bit data bus. Depth and width expansion are supported, so multiple devices can cascade for deeper or wider buffers without external logic. If your design needs a larger FIFO, look at the same CY7C series with higher density, but verify pin compatibility — the footprint changed across density options.
Supply and temperature grade
Maximum supply current is 30 mA, a modest draw that a standard 3.3 V LDO can handle.