The Infineon (Cypress) CY7C4245-15JXC is a synchronous FIFO memory with a 66.7 MHz clock rate and 10 ns access time, organised as 4K words by 18 bits (72K total).
66.7 MHz clock and 10 ns access — timing budget for the bus
The 66.7 MHz clock rate gives a 15 ns period. The 45 mA maximum supply current is a reasonable budget for a 5 V FIFO running at this speed; a 3.3 V-only system would need a level translator or a different FIFO family.
68-PLCC footprint — hand-solderable but board-hungry
The 68-PLCC (24.23 x 24.23 mm) J-lead package is one of the larger PLCC footprints.
Obsolete — no official successor on record
The CY7C4245-15JXC is listed as Obsolete. No official replacement part number is provided in the lifecycle record.