Which gates act as universal gates?

• Jul 6, 2006

• #1

T

tronix

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Which gate apart frm nand and NOR CAN ACT AS UNIVERSAL GATE ?

 

• Jul 6, 2006

• #2

K

Kral

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Re: Universal Gates

tronix,
Exclusive OR. It can be argued that the exclusive OR can be constructed from NAND and/or NOR gates. However, the same arguemnent can be used for the NAND and NOR: A NAND CAN be constructed from NORs and a NOR can be constructed from NANDs.
Regards,
Kral

 

• Jul 6, 2006

• #3

T

tronix

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Re: Universal Gates

kral
Can u plz give some example like and/or gate constructed frm XOR gates

 

• Jul 6, 2006

• #4

ivar4ever

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Re: Universal Gates

as far as i know,
only, NAND and NOR gates are universal gates

 

• Jul 6, 2006

• #5

safwatonline

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Universal Gates

actually nand and nor are universla "as far as i know"

ex.
NOT >>>> A nor A =A' >>>>> A nand A= A'
OR >>>> A' nand B' = A or B >>> (A nor B)' = A or B
and >>>> A' nor B' = A and B >>> (A nand B)'=A and B

not any bar can be acheived by "NOT"

Added after 6 minutes:

sorry is "apart" means besides , if so then excuse me >>
a MUX is a universal gate
F=A B + C B' >>>>>> A=0 >>> F=C and B'
>>>>>> A=1 >>> F= C or B

 

• Jul 6, 2006

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T

tronix

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Re: Universal Gates

thats seems to be a solution
Thnx

 

• Jul 7, 2006

• #7

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balu304

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Re: Universal Gates-Mux,Inhibit,implication,HA etc.

Universal gates are those from which we can produce all kind of gates.
following are the examples.
1)And-Or-Not
2)NAND
3)INHIBIT X.Y'
X'Y
4)iMPLICATION X+Y'
X'+Y
5)NOR
6)XOR WITH AND
7)EQUALITY(XNOR) WITH AND
8)MUX
9)HALF ADDER
one can try all these gates to realize each and every gate.

 

• Jul 7, 2006

• #8

S

sanjiv

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Re: Universal Gates

Universal gates are the one, which can be used for implementing any gate like AND, OR and NOT. Also used for implementing gates of any combination of these basic gates. NAND and NOR gates are the only Universal gates.

 

• Jul 7, 2006

• #9

neils_arm_strong

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Universal Gates

NAND and NOR are universal.

 

• Jul 7, 2006

• #10

M

manojkrshukla

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Re: Universal Gates

NAND , NOR, and MUX may be treated as universal gates.

 

• Jul 7, 2006

• #11

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Sceadwian

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Universal Gates

Simple schmitt triggered inverters can be used as a universal gate.
They can also be used as pulse generators, pulse stretchers, and clock generators using only a resistor and a capacitor (granted with great variances)

**broken link removed**

 

• Jul 8, 2006

• #12

sreejith

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Re: Universal Gates

XOR can also be used as univesal gate:-
XOR with one of its i/p is 1 is called controlled inverter
similarly it canbe used to construct any other gate including AND and OR- only4to5 gates will be required as in the case of NAND and NOR

 

• Jul 8, 2006

• #13

salma ali bakr

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Re: Universal Gates

well..i guess it is like safwat said:

nand, nor and mux

 

• Jul 8, 2006

• #14

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balu304

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Re: Universal Gates

I already mentioned all possible universal gates in this post.
XOR is not an universal gate.can u form NAND gate or NOR gate with using only XOR gate...?try...u can't.so XOR is not an universal gate.If u can form NAND gate(which is an universal gate) using XOR gate,then XOR will also become an Universal gate.right....?

 

• Jul 8, 2006

• #15

C

carrot

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Re: Universal Gates

Hi,

MUX is also an universal gate apart from NAND and NOR gates.

 

• Jul 8, 2006

• #16

T

tronix

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Re: Universal Gates

sreejith said:

XOR can also be used as univesal gate:-
XOR with one of its i/p is 1 is called controlled inverter
similarly it canbe used to construct any other gate including AND and OR- only4to5 gates will be required as in the case of NAND and NOR

Click to expand...

Hi Sreejith
I tried but couldn't get AND/OR of XORs . Can u plz give ckt

 

• Sep 9, 2006

• #17

F

funster

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Re: Universal Gates

MUX is also a universal gate, by using MUX,

you can make any digital circuit.

you can try it.

best regards

tronix said:

Which gate apart frm nand and NOR CAN ACT AS UNIVERSAL GATE ?

Click to expand...

 

• Sep 9, 2006

• #18

E

electronics_kumar

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Universal Gates

mux should be always called as universal circuit not as a logic gate...

 

• Sep 9, 2006

• #19

neils_arm_strong

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Universal Gates

XOR,XNOR,NOR,NAND are universal gates.

 

• Sep 9, 2006

• #20

T

tronix

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Re: Universal Gates

neils_arm_strong said:

XOR,XNOR,NOR,NAND are universal gates.

Click to expand...

As already discussed XOR and XNOR can not function as universal gate , A Mux indeed can.
Can u make a and/or/nand/nor frm Xor/Xnor? I think no.

tronix