Functional Description
The CY7C42X1 are high speed, low power 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 × 9 (CY7C4421)
   ❐ 256 × 9 (CY7C4201)
   ❐ 512 × 9 (CY7C4211)
   ❐ 1K × 9 (CY7C4221)
   ❐ 2K × 9 (CY7C4231)
   ❐ 4K × 9 (CY7C4241)
   ❐ 8K × 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
■ Independent read and write enable pins
■ Center power and ground pins for reduced noise
■ Width-expansion capability
■ Space saving 7 mm × 7 mm 32-pin TQFP
■ Pin-compatible and functionally equivalent to IDT72421,
   72201, 72211, 72221, 72231, and 72241
■ Pb-free Packages Available