Functional Description

The CY7C42X5 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 toIDT722x5. The CY7C42X5 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

• 64 x 18 (CY7C4425)

• 256 x 18 (CY7C4205)

• 512 x 18 (CY7C4215)

• 1K x 18 (CY7C4225)

• 2K x 18 (CY7C4235)

• 4K x 18 (CY7C4245)

• High-speed 100-MHz operation (10 ns read/write cycle time)

• Low power (ICC =45 mA)

• Fully asynchronous and simultaneous read and write operation

• Empty, Full, Half Full, and Programmable Almost Empty/Almost Full status flags

• TTL-compatible

• Retransmit function

• Output Enable (OE) pin

• Independent read and write enable pins

• Center power and ground for reduced noise

• Supports free-running 50 duty cycle clock inputs

• Width Expansion Capability

• Depth Expansion Capability

• Space saving 64-pin 10x10 TQFP, and 14x14 TQFP

• 68-pin PLCC