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 to IDT722X5. 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
■ 256 x 18 (CY7C4205)
■ 512 x 18 (CY7C4215)
■ 1K x 18 (CY7C4225)
■ 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
■ Transistor-transistor logic (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
■ Available in 64 pin 14 x 14 thin quad flat package (TQFP) and 64 pin 10 x 10 TQFP