Question

Transistor–transistor logic (TTL) is a class of digital circuits built from ____________

(a) JFET only

(b) Bipolar junction transistors (BJT)

(c) Resistors

(d) Bipolar junction transistors (BJT) and resistors

I had been asked this question in final exam.

My question comes from Transistor Transistor Logic(TTL) topic in division Logic Families of Digital Circuits

Answer 1

Correct answer is (d) Bipolar junction transistors (BJT) and resistors

The best explanation: Transistor–transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. However, resistors have a small role to play and both logic gating and amplifying functions are performed by the transistors.