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A B C QA QB QC Y
L L L
L L H
L H L
L H H
H L L
H L H
H H L
H H H

Online Digital Electronics Test: Combinational logic with transistors

Digital Electronics conceives transistors as switches. Briefly, we consider only two states of transistors: fully-ON and fully-OFF. So, levels of currents and voltages are considered sufficient large or low to firmly maintain a state or another.

Possible output states are: L - Low, H - High, Z -High Impedance, and "" prohibited. The last situation usually occurs when the logic state of the input produce a short-circuit at the power source terminals.

IC current sign convention: A current is considered positive if it flows into the device terminal.



© Cornel Mironel Niculae @fizica.unibuc.ro
C.M.Niculae Home Page: www.unibuc.ro/prof/niculae_c_m
2000-

Last updated: March 9, 2015