A bistable circuit includes a first inverter and a capacitive inversion
circuit having one input coupled to an output of the first inverter. The
capacitive inversion circuit includes a second inverter and a capacitive
circuit parallel-coupled to the input and an output of the capacitive
inversion circuit. The bistable circuit also includes a switch to isolate
the output of the capacitive inversion circuit from an input of the first
inverter when the switch receives an active validation signal or, if not,
to couple the output of the capacitive inversion circuit to the input of
the first inverter.