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Combinational Logic Circuits
Are made up from basic logic NAND, NOR, or NOT gates that are “combined” or connected together to produce more complicated switching circuits
Boolean Algebra
Truth Table
Logic Diagram
Three main ways of specifying the function of a combinational logic circuit
Boolean Algebra
Forms the algebraic expression showing the operation of the logic circuit for each input variable either true or false that results in a logic “1” output
Truth Table
Defines the function of a logic gate by providing a concise list that shows all the output states in tabular form for each possible combination of input variable that the gate could encounter
Logic Diagram
A graphical representation of a logic circuit that shows the wiring and connections of each individual logic gate, represented by a specific graphical symbol, that implements the logic circuit
Decision Making Circuits
As combinatoinal logic circuits are made up from individual logic gates only, they can also be considered as __
Combinational Logic
Is about combining logic gates together to process two or more signals in order to produce at least one output signal according to the logical function of each logic gate
Multiplexer and De-Multiplexer
One of the most common uses of combinational logic is in __
Logic Decoder and Solid State Switches
A multiplexer consists of two separate components:
TTL devices
Made up from transistors than can pass signal currents in one direction and are poor imitations of conventional electro-mechanical switches or relays
CMOS Switching devices
Acts as near perfect “bi-directional” switches making them ideal for use as solid state switches
Analogue Switches
Used to route or switch analogue signals
Digital switches
Used to route or switch digital signals (binary 0s and 1s)
Power Switches
Used to control the flow of electrical power to a load
Analogue Switches
Types that are used to switch data or signal currents when they are in their “ON” state and block when on their “OFF” state
Zero resistance when ON and infinite resistance when OFF
Ideal analogue switches has __
Inputs, two or more basic logic gates and outputs
Combinational Logic Circuits consists of __
No memory
Timing
Feedback loops
Combinational logic circuits have __ thus, there operation is instantaneous
