Functional Description
The CY7C408A and CY7C409A are 64-word deep by 8- or 9-bit wide first-in first-out (FIFO) buffer memories. In addition to the industry-standard handshaking signals, almost full/almost empty (AFE) and half-full (HF) flags are provided.
   
Features
• 64 x 8 and 64 x 9 first-in first-out (FIFO) buffer memory
• 35-MHz shift in and shift out rates
• Almost Full/Almost Empty and Half Full flags
• Dual-port RAM architecture
• Fast (50-ns) bubble-through
• Independent asynchronous inputs and outputs
• Output enable (CY7C408A)
• Expandable in word width and FIFO depth
• 5V ± 10% supply
• TTL complete
• Capable of withstanding greater than 2001V electrostatic
    discharge voltage
• 300-mil, 28-pin DIP