40MX & 42MX Field-Programmable Gate Arrays Microchip Technology 40MX and 42MX Field-Programmable Gate Arrays provide a cost-effective 5V design solution. Microchip Technology 40MX and 42MX are single-chip devices that offer high performance, reducing system design and development time. MX devices integrate logic from PALs, CPLDs, and FPGAs, making them ideal for high-speed controllers, address decoding, BUS interfaces, DSP, and co-processor functions.