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Functional Description

The CY7C4255/65 are high-speed, low-power, first-in first-out (FIFO) memories with clocked read and write interfaces. All are 18 bits wide and are pin/functionally compatible to the CY7C42X5 Synchronous FIFO family. The CY7C4255/65 can be cascaded to increase FIFO depth. Programmable features include Almost Full/Almost Empty flags. These FIFOs provide solutions for a wide variety of data buffering needs, including high-speed data acquisition, multiprocessor interfaces, and communications buffering.

Features

? High-speed, low-power, first-in first-out (FIFO) memories

? 8K x 18 (CY7C4255)

? 16K x 18 (CY7C4265)

? 0.5 micron CMOS for optimum speed/power

? High-speed 100-MHz operation (10 ns read/write cycle times)

? Low power — ICC = 45 mA

? Fully asynchronous and simultaneous read and write operation

? Empty, Full, Half Full, and programmable Almost Empty and Almost Full status flags

? TTL compatible

? Retransmit function

? Output Enable (OE) pins

? Independent read and write enable pins

? Center power and ground pins for reduced noise

? Supports free-running 50 duty cycle clock inputs

? Width Expansion Capability

? Depth Expansion Capability

? 64-pin PLCC, 64-pin TQFP and 64-pin STQFP

? Pin-compatible density upgrade to CY7C42X5 family

? Pin-compatible density upgrade to IDT72205/15/25/35/45