logic gate

G

-=GST=- Nemisis (cs/cz)

New Member

• Sep 7, 2004

• #1

hi can ne one tell me the way to make an AND gate from a set of NAND gates and doe sne one have a Nand gate chip design?

if someone knows can they plz write it like this

_
_D- for and

_
_Do- for Nand

thanks!

 

evandude

New Member

• Sep 7, 2004

• #2

_
_Do-<Do-

just use a second NAND with both inputs tied together as an inverter and you have an AND...

 

G

-=GST=- Nemisis (cs/cz)

New Member

• Sep 7, 2004

• #3

nice 1, and does ne one have a chip design?

 

evandude

New Member

• Sep 7, 2004

• #4

what do you mean chip design? that's sort of vague.

 

hotwaterwizard

Active Member

• Sep 7, 2004

• #5

WHAT IS WRONG WITH A PICTURE?

 

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G

-=GST=- Nemisis (cs/cz)

New Member

• Sep 8, 2004

• #6

evandude said:

what do you mean chip design? that's sort of vague.

Click to expand...

erm like this

...........___
pin 1-|.....|- pin 8
pin 2-|.....|- pin 9
pin 3-|.....|- pin 10
pin 4-|.....|- pin 11
pin 5-|.....|- pin 12
pin 6-|.....|- pin 13
pin 7-|.....|- pin 14
............----.
_
and the _Do- on the inside, u used to have one but i lost it

 

evandude

New Member

• Sep 8, 2004

• #7

that's going to depend on what chip you use... why don't you go download the datasheet for the chip you want to use?

for example the 7400

https://www.electro-tech-online.com/custompdfs/2004/09/SN7400_74LS00_74S00.pdf

there isn't a picture with the gates drawn into the chip but on the first page there is the chip labeled with all the info you need: for instance, 1A and 1B are the inputs to the first NAND gate, and 1Y is the output. 2A,2B are the inputs for gate 2, and 2Y is the output, etc. for all 4 gates in the chip. If you really want a pictorial diagram then you can very easily draw one from that datasheet.

 

hotwaterwizard

Active Member

• Sep 8, 2004

• #8

How's This?

---____ ____
---I----U-----I
[1]-----------[8]
---I---555---I
[2]--Timer---[7]
---I----IC----I
[3]------------[6]
---I-----------I
[4]------------[5]
---I_______I

 

G

-=GST=- Nemisis (cs/cz)

New Member

• Sep 9, 2004

• #9

yeah i got it, i just thanks for the data sheet, when i was searching it would only give me and gates :S but thats ok thanks

 

panic mode

Well-Known Member

• Sep 10, 2004

• #10

hotwaterwizard said:

WHAT IS WRONG WITH A PICTURE?

Click to expand...

picture is fine, it's the content 8)

one problem is that AND gate is just a basic element of digital electronics. the whole idea of digital circuits is that you could have tons of basic gates connected into one large circuit.

the diode version of the AND circuit for example can work if the inputs are connected to low impedance outptus. problem is that this cannot be done with the diode AND circuit you posted. (well you can connect it but it won't work).