Nxp 4000 series logic devices nxp hef4069ubt 652 the hef4069ub is a general purpose hex inverter each inverter has a single stageit operates over a recommended vdd power supply range of 3 v to 15 v referenced to vssusually ground unused inputs must be connected to vdd vss or another input nxp hef4069ubt 652 hex inverter so 14