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