Synchronous FIFO for data buffering — 72K x 18 at 66.7 MHz
The Cypress CY7C4245-15AXCT is a synchronous FIFO memory from the CY7C series, organized as 4K x 18 bits (72K total). It is designed for high-speed data buffering in applications that require a first-in, first-out data queue with minimal latency. The part supports a 66.7 MHz data rate and a 10 ns access time, making it suitable for bridging data-rate mismatches or temporary storage in telecom, networking, and industrial control systems.
The 66.7 MHz clock rate allows one 18-bit word per cycle. The 10 ns access time defines the setup-and-hold budget on the downstream bus.
Depth and width expansion — daisy-chaining multiple FIFOs
This FIFO supports both depth and width expansion, so multiple CY7C4245-15AXCT devices can be cascaded to build larger buffer arrays — for example, wider data words by paralleling devices, or deeper queues by chaining them in series. The retransmit capability allows re-reading data from the FIFO without a full reset, useful in packet-retry or error-recovery schemes. Programmable flags give the system designer control over almost-full/almost-empty thresholds, reducing host polling overhead.
64-LQFP footprint — surface-mount assembly notes
Housed in a 64-LQFP package (14x14 mm body,), this is a standard fine-pitch surface-mount part. The 64-TQFP (14x14) supplier device package is the same footprint — the LQFP and TQFP designations are often interchangeable in practice, but confirm the exact land pattern against the datasheet.