Functional Description
The CY7C4261/71/81/91V are high-speed, low-power FIFO memories with clocked read and write interfaces. All are nine bits wide. The CY7C4261/71/81/91V are pin-compatible to the CY7C42x1V Synchronous FIFO family.
   
Features
• 3.3V operation for low power consumption and easy
    integration into low-voltage systems
• High-speed, low-power, first-in first-out (FIFO)
    memories
• 16K × 9 (CY7C4261V)
• 32K × 9 (CY7C4271V)
• 64K × 9 (CY7C4281V)
• 128K × 9 (CY7C4291V)
• 0.35-micron CMOS for optimum speed/power
• High-speed 100-MHz operation (10-ns read/write cycle
    times)
• Low power
    — ICC = 25 mA
    — ISB = 4 mA
• Fully asynchronous and simultaneous read and write
    operation
• Empty, Full, and programmable Almost Empty and
    Almost Full status flags
• Output Enable (OE) pin
• Independent read and write enable pins
• Supports free-running 50% duty cycle clock inputs
• Width- Expansion capability
• 32-pin PLCC
• Pin-compatible density upgrade to CY7C42X1V family
• Pin-compatible 3.3V solutions for CY7C4261/71/81/91