Single event upset hardened flip-flop and methods of operation

A method comprising:

• receiving an input logic level at a master latch of a flip-flop at a first logic level transition of a clock, the master latch having only one latch;
• outputting by the master latch a logic level based on the input logic level;
• inputting the output logic level to a first slave latch and a second slave latch at a second logic level transition of the clock;
• and
• providing output logic levels of the first slave latch and second slave latch to a Muller element coupled to a bus keeper, wherein the Muller element outputs to the bus keeper a first logic level or second logic level when the output logic levels of the slave latches are the same and outputs a tri-state when the output logic levels of the slave latches are different which results from a single event upset (SEU), wherein a first logic level or second logic level output by the bus keeper does not change in presence of the SEU, wherein the bus keeper and Muller element are separated by a distance that both the bus keeper and Muller element are not impacted by the SEU and a duty cycle that the one master latch outputs the logic signal to the slave latches is selected to minimize effect of the SEU on the logic signal before being latched by the slave latches.