Abstract: A totem pole driver with cross conductive protection and default low impedance state output employs a totem pole output formed by top and bottom output transistors. A first circuit path switches the bottom output transistor on or off in response to a switching signal. A second circuit path, slower than the first circuit path, switches the top output transistor on in response to the switching signal after the bottom output transistor is switched off. A third circuit path switches the top output transistor off in response to a sync signal known to lead the switching signal. An emergency voltage supply is made available to hold the bottom output transistor on and the top output transistor off if the regulated circuit voltage is lost.

Abstract: A latchable comparator including a comparator and a circuit having a reset input. When the comparator produces a first state, it is latched when the reset input is in the non-reset state. In this state, the comparator receives a comparison signal having a high or low value and a latch signal being outside the range of voltages extending between the low and high values. A reset signal causes the latch signal to be replaced by a comparator reference signal. Further disclosed is a latchable comparator including a comparator and a flip-flop. The comparator has a ramp input, a control input, a first reference input and a second reference input. The flip-flop provides latch signals to each of the first and second reference inputs when its reset input is in the non-reset state and said comparator is generating a first state and maintains the latch signals until a reset signal is received.