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.

特性 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