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Totem-pole output: two transistors with opposite drive :

- if T1 is open, T2 is closed >> so the output is Vcc or logical 1

- if T1 is closed, T2 is open >> so the output is GND or logical 0

Vcc

|

T1

|

-----output

|

T2

|

GND

Open collector output: the output with one transistor, whom collector is on Vcc through a R resistor.

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