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