{TAIL ~ a second voltage monitor} coupled to a second voltage source at a first input thereof and {HEAD ~ a second threshold voltage} at a second input, the second voltage source operable at the second voltage or operable to be driven by an output of the voltage regulator, 
{ TAIL ~ a second voltage monitor } coupled to a second voltage source at a first input thereof and { HEAD ~ a second threshold voltage } at a second input , the second voltage source operable at the second voltage or operable to be driven by an output of the voltage regulator ,
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH