Functional Description
The CY7C436x3 is a monolithic, high-speed, low-power, CMOS Unidirectional Synchronous (clocked) 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 x 36 dual-port SRAM FIFOs on board each chip buffer data in opposite directions. FIFO data on Port B can be output in 36-bit, 18-bit, or 9-bit formats with a choice of Big or Little Endian configurations.

Features
• High-speed, low-power, Unidirectional, First-in, First-out (FIFO) memories w/bus matching capabilities
• 1Kx36 (CY7C43643)
• 4Kx36 (CY7C43663)
• 16Kx36 (CY7C43683)
• 0.35-micron CMOS for optimum speed/power
• High-speed 133-MHz operation (7.5 ns read/write cycle times)
• Low power
   — ICC = 100 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 mode user selectable
• Partial Reset
• Big or Little Endian format for word or byte bus sizes
• 128-pin TQFP packaging
• Easily expandable in width and depth