Functional Description
THe CY7C42X1 are high-speed, low-power, first-in first-out (FIFO) memories with clocked read and write interfaces. All are 9 bits wide. The CY7C42X1 are pin-compatible to IDT722X1. 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 (CY7C4421)
• 256 x 9 (CY7C4201)
• 512 x 9 (CY7C4211)
• 1K x 9 (CY7C4221)
• 2K x 9 (CY7C4231)
• 4K x 9 (CY7C4241)
• 8K x 9 (CY7C4251)
• High-speed 100-MHz operation (10 ns read/write cycle time)
• Low power (ICC = 35 mA)
• Fully asynchronous and simultaneous read and write operation
• Empty, Full, and Programmable Almost Empty and Almost Full status flags
• TTL- compatible
• Expandable in width
• Output Enable (OE) pin
• Independant read and write enable pins
• Center power and ground pins for reduced noise
• Width Expansion Capability
• Space saving 7mm x 7mm 32-pin TQFP
• 32-pin PLCC
• Pin compatible and functionally equivalent to IDT72421, 72201, 72211, 72221, 72231, 72241