CY7C456

The CY7C455, CY7C456, and CY7C457 are high-speed, low-power, first-in first-out (FIFO) memories with clocked read and write interfaces. The CY7C455, CY7C456, and CY7C457  are 18 bits wide. The CY7C455 has a 512-word memory array, the CY7C456 has a 1,024-word memory array, and the CY7C457 has a 2,048-word memory array. The CY7C455, CY7C456, and CY7C457 can be cascaded to increase FIFO depth. Programmable features include Almost Full/Empty flags and generation/checking of parity. The CY7C455, CY7C456, and CY7C457 provide solutions for a wide variety of data buffering needs, including high-speed data acquisition, multiprocessor interfaces, and communications buffering.
The CY7C455, CY7C456, and CY7C457  have 18-bit input and output ports that are controlled by separate clock and enable signals. The input port is controlled by a free-running clock (CKW) and a write enable pin (ENW).