General Description The MM54HC05/MM74HC05 are logic functions fabricated by using advanced silicon-gate CMOS technology, which provides the inherent benefits of CMOSÐlow quiescent power and wide power supply range. These devices are also functionally and pin-out compatible with standard DM54LS/DM74LS logic families. The MM54HC05/ MM74HC05 open drain Hex Inverter requires the addition of an external resistor to perform a wire-NOR function. All inputs are protected from static discharge damage by internal diodes to VCC and ground.