Functional Description
The CY7C42X1V are high-speed, low-power, first-in first-out (FIFO) memories with clocked read and write interfaces. All are 9 bits wide. Programmable features include Almost Full/Almost Empty flags. These FIFOs provide solutions for a wide variety of data buffering needs, including high-speed data acquisition, multiprocessor interfaces, and communications buffering.

FEATUREs
• High-speed, low-power, first-in, first-out (FIFO) memories
• 64 x 9 (CY7C4421V)
• 256 x 9 (CY7C4201V)
• 512 x 9 (CY7C4211V)
• 1K x 9 (CY7C4221V)
• 2K x 9 (CY7C4231V)
• 4K x 9 (CY7C4241V)
• 8K x 9 (CY7C4251V)
• High-speed 66-MHz operation (15 ns read/write cycle time)
• Low power (ICC = 20 mA)
• 3.3V operation for low power consumption and easy integration into low voltage systems
• 5V tolerant inputs VIH max= 5V
• Fully asynchronous and simultaneous read and write operation
• Empty, Full, and Programmable Almost Empty and Almost Full status flags
• TTL compatible
• Output Enable (OE) pin
• Independent read and write enable pins
• Center power and ground pins for reduced noise
• Width Expansion Capability
• Space saving 32-pin 7mm x 7mm TQFP