An electronic charge retention circuit for time measurement, including: at least a first capacitive element, a first electrode of which is connected to a floating node (F); at least a second capacitive element, a first electrode of which is connected to the floating node, the first capacitive element having a leakage through its dielectric space and the second capacitive element having a capacitance greater than the first; and at least a first transistor having an isolated control terminal connected to the floating node.