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NAND AND NOR gates are called universal gates , becaus with a combination NAND and NOR gates alone, it's possible to create all other logic gates like AND, OR, XOR etc and you can design any logic circuit. eg: inverter-- nand with inputs shorted.

and ------ nand followed by a inverter(using nand).

or--------- giving inverted inputs to nand gate.

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Q: Why NAND and NOR gates are called universal gates?

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actually any digital circuit can be designed by using only any one type of gates either nand or nor that's why they are called as universal gate. even basic logic gates AND ,OR,NOT can also be designed using them.now choosing one of two (nor n nand) depends on if logic expression is of sop type or pos type. by-ramendrafor more info contact ramendraawasthi@ymail.comThey are called universal gates because all of the other gates may be constructed using only those two gates. That is important because it's a lot cheaper in practice to make lots of similar things than a bunch of different things (different gates). Simple, huh? - By MANOJ GUJARIIt's easy and cheaper to design NAND or NOR gate using CMOS (4 transistors).

THE MAIN ADVANTAGE OF THE UNIVERSAL LOGIC GATES IS THAT IT CAN BE USED TO MADE ANT KIND OF LOGIC GATE .......BY USING IT . NAND AND NOR ARE CALLED AS UNIVERSAL GATES ARE USED TO MAKE ANY GAATES AS OR ,AND, XNOR,NOT. logic gates are used in many everyday electronic devices such as tv's, computers and telephones.

Because they are universal, which means you can build entire circuits out of only NAND or NOR gates, instead of combinations of OR, AND and the other gates. As a result, companies buy bulks of NAND gates to save money, because ordering one thing in huge numbers will always be cheaper than buying various things at the same number for the manufacture.

Next: Boolean Expressions Up: Universality of certain gates Previous: Universality of certain gates ContentsUsing NAND gatesNOTFigure 12.10: Realizing a NOT gate using a NAND gateOR The following statements are called DeMorgan's Theorems and can be easily verified and extended for more than two variables.(12.1)(12.2)(12.3)(12.4)In general: (12.5)Thus :(12.6)Now it is easy to see that , which can be checked from the truth table easily. The resulting realization of OR gate is shown in 12.11Figure 12.11: Realization of OR gate by NAND gatesAND gateFigure 12.12: Realization of AND gate by NAND gatesX-OR gate(12.7)Clearly, this can be implemented using AND, NOT and OR gates, and hence can be implemented using universal gates.Figure 12.13: X-OR gateX-NOR gate(12.8)Again, this can be implemented using AND, NOT and OR gates, and hence can be implemented using universal gates, i.e., NAND or NOR gates.Figure 12.14: X-NOR gateNext: Boolean Expressions Up: Universality of certain gates Previous: Universality of certain gates Contentsynsingh 2007-07-25

two crosscoupled NAND or NOR gates.

Related questions

Nand and nor gates are called universal gates .they called so as since any logic function can be done with nand and nor gates

All other gates can be made from NAND or NOR gates.

There are two universal gates called NAND and NOR

NAND/NOR gates are called universal gates because combinations of them can be used to create all the basic logical functions.Why_NAND_gates_and_NOR_gates_in_logic_circuits_are_universal_gates

Both are universal gates.

The NAND gate and NOR gates are known as universal gates, since any logic function can be implemented using NAND or NOR gates.

NAND and NOR gates are able to create any electronic circuits by themselves, without any other gates!

A NAND gate can be used to construct other logic gates such as AND, OR, NOR and others. This is why it is called a universal gate.

by combining nand gate and nor gate we can implement all other gates.that is why they are called universal gates

A logic circuit of any complexity can be realized by using only the three basic gates (NOT, AND, and OR Gates). There are two universal gates, the NAND Gate and the NOR gate. Each of those can also realize logic circuit single-handedly. The NAND and NOR gates are therefore called universal gates.

NAND And NOR Gates

NAND and NOR

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