Methods, devices, and systems are disclosed that generally perform a time delay determination of a voltage change on a signal node to determine a corresponding signal value on another node causing the voltage change. In an example the circuit device includes a first circuit configured to couple, when enabled, a signal value onto a first node, and a read circuit having an input coupled to the first node. The read circuit is configured to effect a voltage transition of a signal node at a variable rate corresponding to the voltage of the first node, and to determine the signal value based upon a time-to-transition measurement of the signal node.