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