Functional Description
The CY7C436X4AV is a monolithic, high-speed, low-power, CMOS Bidirectional Synchronous FIFO memory which 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. FIFO data on Port B can be input and output in 36-bit, 18-bit, or 9-bit formats with a choice of Big or Little Endian configurations.

FEATUREs
• 3.3V high-speed, low-power, bidirectional, First-In
   First-Out (FIFO) memories w/ bus matching capabilities
• 1K × 36 × 2 (CY7C43644AV)
• 4K × 36 × 2 (CY7C43664AV)
• 16K × 36 × 2 (CY7C43684AV)
• 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 Reset
• Big or Little Endian format for word or byte bus sizes
• 128-pin TQFP packaging
• Easily expandable in width and depth