The Infineon CY7C4215-15AXIT is a 9K (512 x 18) synchronous FIFO memory designed for buffering data between clock domains or across buses running at up to 66.7 MHz. Its 10 ns access time allows it to keep pace with fast processors and DSPs without wait states, and the 18-bit word width suits 16-bit data paths with parity or tag bits.
Data rate and access time — the bus timing margin
At 66.7 MHz the CY7C4215-15AXIT delivers a 15 ns clock period, and the 10 ns access time leaves 5 ns of setup/hold margin for the downstream logic. The synchronous interface uses a single clock for read and write operations, simplifying the timing analysis compared to asynchronous FIFOs.
Memory depth and width — sizing the buffer
The 9K bit memory is organized as 512 words of 18 bits each. In a 16-bit system the extra two bits per word can carry a parity or flag, or the device can be configured as 512 x 16 plus two unused bits. The depth of 512 words suits moderate-size packet buffers and rate-matching queues; applications needing deeper buffering require the expansion mode (depth or width cascade) that this part supports. The 50 mA maximum supply current gives a rough power budget for thermal design in the 64-LQFP package.
Infineon lists the CY7C4215-15AXIT as Obsolete. No last-time-buy window remains; the buyer should qualify the date code and condition of any material sourced through this channel.