The CY7C4251-15JXC is a synchronous FIFO from Infineon Technologies' CY7C series, organized as 8K x 9 bits for a total memory size of 72 Kbit. It operates at a data rate of 66.7 MHz with a 10 ns access time, making it suitable for buffering data streams in digital systems where clocked transfers are preferred over asynchronous handshaking. The device supports depth and width expansion, includes programmable flags, and uses a uni-directional bus. It does not support FWFT (First-Word Fall-Through) or retransmit capability, so the designer must account for the standard synchronous FIFO read/write protocol without these advanced features. Operating temperature is specified for 0°C to 70°C, which is the commercial-grade range — not suitable for extended industrial or automotive environments without additional thermal management.
Packaged in a 32-LCC (J-Lead) form factor, the supplier device package is a 32-PLCC measuring 11.43 x 13.97 mm. The J-lead footprint is surface-mount and requires a reflow profile compatible with PLCC bodies — typically a peak temperature around 245°C for lead-free solder. The tube packaging is standard for through-tube handling; the parts are not supplied on tape-and-reel, so the pick-and-place feeder must be configured for tube feed. For a synchronous FIFO at 66.7 MHz, the 10 ns access time is the critical timing parameter — the output data becomes valid 10 ns after the read clock edge, and the setup/hold windows of the downstream logic must accommodate this.
The CY7C4251-15JXC is classified as Obsolete by Infineon Technologies. This means the manufacturer has discontinued production and no further last-time-buy or life-time-buy windows are available from the factory. The part is no longer orderable through standard authorized distribution channels.