Synchronous FIFO – 66.7 MHz, 4K x 18, 68-PLCC
The CY7C4245-15JXCT is a synchronous FIFO memory with a 4K x 18 organization, clocked at 66.7 MHz and delivering a 10 ns access time. This part belongs to the CY7C series and is housed in a 68-lead PLCC (J-Lead) package, supplier device package 68-PLCC (24.23x24.23). The synchronous architecture uses a free-running clock for data transfer, which simplifies the interface in high-speed data buffering applications.
This means the manufacturer has discontinued regular production and no last-time-buy window is open. For a BOM line that requires this exact order code, sourcing is limited to independent distribution and the open market.
Key Parametrics for Bus Timing and Expansion
The 66.7 MHz data rate sets the maximum throughput at 66.7 million 18-bit words per second – about 1.2 Gbps. Depth and width expansion are supported, so multiple CY7C4245-15JXCT devices can be cascaded to build larger FIFO arrays. Programmable flags (almost-full, almost-empty) give the system controller direct flow-control signals without polling the fill counter. Maximum supply current is 45 mA, which is modest for a 5 V synchronous FIFO running at 66.7 MHz. The retransmit capability allows the FIFO to re-send a block of data from the last reset boundary – useful in packet-based error recovery schemes.
Package and Mounting – 68-PLCC (J-Lead)
The 68-PLCC package with J-leads is a surface-mount footprint (24.23 mm square body).