The maximum recommended bus voltage is lower than the absolute maximum voltage ratings on A, C, and VDD solely to provide margin for transients on the bus. Most power systems experience transient voltages above the normal operating level. Short transients, or voltage spikes, may be clamped by the ORing MOSFET to an output capacitor and/or voltage rail depending on the system design. Transient protection, that is, a TVS diode (transient voltage suppressor, a type of Zener diode), may be required on the input or output if the system design does not inherently limit transient voltages below the device absolute maximum ratings. If a TVS is required, it must protect to the absolute maximum ratings at the worst case clamping current. The devices operate properly up to the absolute maximum voltage ratings on A, C, and VDD.