I am new in the world of electronics and am having trouble understanding an example circuit found in the LM139 data sheet. I created the circuit on a breadboard and it does indeed work, but I am not understanding the current flow and WHY it works.
http://www.ti.com/lit/ds/symlink/lm2901-n.pdf The circuit in question is figure 28(Limit comparator) on page 16 of the datasheet.
Since the output of the LM139 is an open collector, when both comparators are "HI"(the input signal is in between the non-inverting pin of comp 1 and the inverting pin of comp 2), would that not sink the current to ground by turning on the internal transistor and not allow the voltage source to activate the external transistor? Could someone walk through how this circuit behaves?