CY7C4221 CY7C42311 K / 2 K × 9 Synchronous FIFOs .
CY7C4231V - Low-Voltage 64/256/512/1K/2K/4K/8K x 9 Synchronous FIFOs
CY7C4231 - 1 K / 2 K x 9 Synchronous FIFOs