Patent ID: 6825691
Filing Date: 2004-11-30
Classification: G11C

Abstract:
A radiation resistant latch comprising:an output node; first, second and third sublatches, wherein the sublatches each have input circuitry, an output node coupled to the sublatch's input circuitry and feedback circuitry coupled to the sublatch's output node for reinforcing an output signal of the sublatch, and the sublatches are operable to receive a data signal at their respective input circuitry and responsively generate binary-state output signals on their respective output nodes, and wherein the output node of at least the third sublatch is coupled to the latch output node and the output nodes of the first and second sublatches are respectively connected in the latch such that if any one of the three sublatches is subjected to a radiation induced erroneous change of state, the output signals of the other two sublatches reduce an effect of the change on an overall output signal for the latch, providing improved radiation immunity; and a number of scanning-mode control switches coupled to ones of the sublatches for scanning data in to the latch.