1. The problem statement, all variables and given/known data Question: Refer to Fig. 6-5. This standard TTL 2-input NAND gate uses ______ (open-collector, totem pole) outputs. Solution: The 2-input TTL NAND gate in Fig. 6-5 (which is attached as "TheFigure.jpg") uses a totem pole output configuration. 2. Relevant equations N/A 3. The attempt at a solution I don't know what the little black triangles with a line tangent to its tip signify. Could someone please walk me through this circuit because I understand almost nothing. I don't even understand what is meant by open-collector and totem pole outputs. What I think I get is that if the currents for inputs A and B do not go to the ground that means that the inputs are each 1/high and then, somehow, “magic happens” and the current goes through all that stuff and an output is obtained. Any help in fully understanding what is going on with this problem would be greatly appreciated!