Functional Description

The CY7C4281/91 are high-speed, low-power FIFO memories with clocked read and write interfaces. All are nine bits wide. The CY7C4281/91 are pin-compatible to the CY7C42X1 Synchronous FIFO family. 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

• 64K × 9 (CY7C4281)

• 128K × 9 (CY7C4291)

• 0.5-micron CMOS for optimum speed/power

• High-speed 100-MHz operation (10-ns read/write cycle times)

• Low power

— ICC = 40 mA

— ISB = 2 mA

• 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

• Supports free-running 50 duty cycle clock inputs

• Width Expansion Capability

• Pin-compatible density upgrade to CY7C42X1 family

• Pin-compatible density upgrade to IDT72201/11/21/31/41/51