Question 1:
The output circuitry of a typical TTL logic gate is commonly referred to a totem-pole output because the two output transistors are stacked one above the other like carvings on a totem pole. Is a gate circuit with a totem-pole output stage able to source load current, sink load current, or do both?
Answer 1:
The totem-pole output circuitry provides the ability to both actively source or sink current, being useful for driving capacitive loads.