US Patent 7759969 Programmable logic devices comprising time multiplexed programmable interconnect

A time multiplexed programmable switch of a semiconductor device comprising: a first node; and a plurality of second nodes, each of the second nodes having a path to couple to the first node, the path comprising: a first configurable device configured to select or deselect the path; and a second configurable device in series with the first configurable device configured to select or deselect the path by a digital signal; wherein, the plurality of digital signals are time multiplexed to have no more than one second device in the select state within a time interval.