Functional Description
The CY7C436X6AV is a monolithic, high-speed, low-power, CMOS Bidirectional Synchronous FIFO memory that supports clock frequencies up to 133 MHz and has Read access times as fast as 6 ns. Two independent 1K/4K/16K × 36 dual-port SRAM FIFOs on board each chip buffer data in opposite directions.

Features
• 3.3V high-speed, low-power, First-In First-Out (FIFO) memories with three independent ports (one bidirectional ×36, and two unidirectional ×18)
• 1K ×36/×18×2 (CY7C43646AV)
• 4K ×36/×18×2 (CY7C43666AV)
• 16K ×36/×18×2 (CY7C43686AV)
• 0.25-micron CMOS for optimum speed/power
• High-speed 133-MHz operation (7.5-ns Read/Write cycle times)
• Low power
    — ICC= 60 mA
    — ISB= 10 mA
• Fully asynchronous and simultaneous Read and Write operation permitted
• Mailbox bypass register for each FIFO
• Parallel and serial programmable Almost Full and Almost Empty flags
• Retransmit function
• Standard or FWFT user-selectable mode
• Partial and master reset
• Big or Little Endian format for word or byte bus sizes
• 128-pin TQFP packaging
• Easily expandable in width and depth