The MuxIt is a family of general-purpose, multiple-chip building blocks for implementing parallel data serializers and deserializers. The system allows for wide parallel data to be transmitted through a reduced number of differential transmission lines over distances greater than can be achieved with a single-ended (e.g., LVTTL or LVCMOS) data interface. The number of bits multiplexed per transmission line is user selectable, allowing for higher transmission efficiencies than with other existing fixed ratio solutions. Muxlt utilizes the LVDS (TIA/EIA-644) low voltage differential signaling technology for communications between the data source and data destination.