Being 5v tolerant is the only part that introduces complexion…that generally hard-to-find ready-to-go, but perhaps look at getting this FPGA https://www.sparkfun.com/products/16527 , and using a few of these low-cost logic-level converters https://www.sparkfun.com/products/12009 to reduce the I/O voltage down to the ever-present 3.3v