Comment on Totem pole .

Totem pole is series connection of BJT and a diode. It ensures that at one time only one of the two output transistors is ON thus, reducing power dissipation. Also since the transistors are connected in common collector mode thus output impedance is small resulting in fast charging times of capacitive loads. The disadvantage of totem pole is that it does not facilitate wired logic. So we have to use open collector modes.