Various aspects are directed to providing an output/state based upon an input value. Consistent with one or more embodiments, an apparatus includes a bias circuit that is connected between power and common rails and includes first and second current paths that provide first and second reference currents. A current-mirroring circuit provides a first mirrored current in response to a voltage input transitioning in a first direction between voltage levels, and a second mirrored current in response to a voltage input transitioning in an opposite direction. A logic circuit operates in a first state based upon the first mirrored current and the first reference current, and operates in a second state based upon the second mirrored current and the second reference current.