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