Functional Description

The CYC47X FIFO series consists of high-speed, low-power, first-in first-out (FIFO) memories with programmable flags and retransmit mark. The CY7C470, CY7C472, and CY7C474 are 8K, 16K, and 32K words by 9 bits wide, respectively. They are offered in 600-mil DIP, PLCC, and LCC packages. Each FIFO memory is organized such that the data is read in the same sequential order that it was written.

Features

• 8K x 9, 16K x 9, and 32K x 9 FIFO buffer memory

• Asynchronous read/write

• High-speed 33.3-MHz read/write independent of depth/width

• Low operating power

— ICC (max.) = 70 mA

• Programmable Almost Full/Empty flag

• Empty, Almost Empty, Half Full, Almost Full, and Full status flags

• Programmable retransmit

• Expandable in width

• 5V ± 10 supply

• TTL compatible

• Three-state outputs

• Proprietary 0.8-micron CMOS technology