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