Question

Propagation delay times can be divided as __________

(a) t(PLH) and t(LPH)

(b) t(LPH) and t(PHL)

(c) t(PLH) and t(PHL)

(d) t(HPL) and t(LPH)

This question was addressed to me in an online interview.

The doubt is from Digital Integrated Circuits topic in section Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

Answer 1

Right choice is (c) t(PLH) and t(PHL)

To explain I would say: Propagation delay times can be divided as: t(PLH) and t(PHL). t(PLH) stands for propagation from low to high and t(PHL) stands for propagation from high to low.