Syllabus :- Diploma E.E., Subject :- Digital Electronics


 

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Number Systems

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An Introduction to Digital Logic Families

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  What is a Logic Family? In Digital Designs, our primary aim is to create an Integrated Circuit (IC). A Circuit configuration or arrangement of the circuit elements in a special manner will result in a particular Logic Family. What are the advantages of creating different Logic Families? Electrical Characteristics of the  IC will be identical. In other words, the different parameters like Noise Margin, Fan In, Fan Out etc will be identical. Different ICs belonging to the same logic families will be compatible with each other. Some Characteristics we consider for the selection of a particular Logic Family are: Supply voltage range  Speed of response  Power dissipation  Input and output logic levels  Current sourcing and sinking capability Fan-out  Noise margin The basic Classification of the Logic Families are as follows: Bipolar Devices MOS Devices Hybrid Devices  Bipolar Families: Diode Logic (DL) Resistor Transistor Logic (RTL) Diode Transistor Logic (DTL) Transistor- Transistor Log
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