The Cypress CY7C4251V-15AXCT is a synchronous FIFO memory from the CY7C series, organized as 8K x 9 bits (72 Kbit total). It operates at a 66.7 MHz data rate with an 11 ns access time, making it suitable for buffering data between asynchronous clock domains or rate-matching in telecom, networking, and video processing equipment. The 9-bit width supports parity alongside an 8-bit data byte. It is a unidirectional, depth- and width-expandable FIFO without FWFT (First-Word Fall-Through) or programmable flags. Retransmit capability is not supported.
Package and temperature grade — board-fit details
If the reel's moisture-barrier bag has been opened, bake before reflow to avoid popcorning.
Obsolete — sourcing and replacement reality
The CY7C4251V-15AXCT is officially obsolete. For new designs, a current-generation synchronous FIFO from Cypress (now Infineon) or a pin-compatible alternative from another vendor should be evaluated.