![]() Resistor, R 3, serves to limit the current. ![]() As it has a forward current gain, it gives a higher discharge current to discharge the base of T 2 whenever turning it off.ī) The output transistor pair, T 3 and T 4 as shown in figure below are termed to as a totem-pole output, can actively sink or source current to or from capacitive loads and permits the output voltage to be stated independently of the load joined to the gate. The transistor can work in either forward or reverse mode to steer current to or from T 2. A few of the notable features of the circuit structure of TTL Logic family are as:Ī) An input transistor, T 1, that performs a current steering function, can be considered of as a back-to-back diode arrangement.įigure: Equivalent of Input Current-Steering Transistor This circuit overcomes the limitations of single transistor inverter circuit. The circuit diagram of Transistor Logic inverter is as shown in figure below. Theory of TTL Inverter and its Transfer Characteristic
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