Functional Description
The CY7C401 and CY7C403 are asynchronous first-in first-out (FIFOs) organized as 64 four-bit words. The CY7C402 and CY7C404 are similar FIFOs organized as 64 five-bit words. Both the CY7C403 and CY7C404 have an output enable (OE) function.

Features
• 64 x 4 (CY7C401 and CY7C403) 64 x 5 (CY7C402 and CY7C404) High-speed first-in first-out memory (FIFO)
• Processed with high-speed CMOS for optimum speed/power
• 25-MHz data rates
• 50-ns bubble-through time—25 MHz
• Expandable in word width and/or length
• 5-volt power supply ± 10% tolerance, both commercial and military
• Independent asynchronous inputs and outputs
• TTL-compatible interface
• Output enable function available on CY7C403 and CY7C404
• Capable of withstanding greater than 2001V electrostatic discharge
• Pin compatible with MMI 67401A/67402A