Design of Basic All-NAND Circuits using Logic Gate Technology

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Discussion Overview

The discussion revolves around the design of basic all-NAND circuits, exploring how these circuits are constructed in practice, particularly focusing on the use of various logic gate technologies such as TTL, NMOS, PMOS, and CMOS.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the practical construction of all-NAND circuits and whether they are made by combining TTL integrated circuits.
  • Another participant questions the rationale behind restricting designs to only NAND gates.
  • It is suggested that as long as a single technology like TTL is used, gates can be connected as needed, which is considered mostly correct.
  • Several logic technologies are mentioned, including NMOS, PMOS, DTL, TTL, and ECL, with a note that CMOS logic has become more popular in microprocessor design.
  • A participant provides a link to a resource that covers basic gates and suggests it may contain relevant information about all-NAND circuits.
  • There is a mention that some technologies may favor NAND gates, while ECL is noted to favor NOR gates.

Areas of Agreement / Disagreement

The discussion contains multiple viewpoints regarding the construction and design principles of all-NAND circuits, and no consensus is reached on the best approach or the implications of using different technologies.

Contextual Notes

Participants express uncertainty about the specific implications of using various technologies and how they relate to the design of all-NAND circuits. There are also unresolved questions about the practical aspects of combining integrated circuits.

axe34
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The problem statement
Hi
I'm writing a report on a design of a basic all-NAND circuit.
In reality, how are these circuits made ? Do we just use TTL etc. integrated circuits and combine them as necessary?

Thanks
 
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Do you understand why you might want to restrict yourself to using only NAND gates?
 
axe34 said:
Do we just use TTL etc. integrated circuits and combine them as necessary?
So long as you stick with the one technology, e.g., TTL, you can connect up gates as needed. That's 99% correct.
 
Some options include NMOS logic, PMOS logic, DTL, TTL, ECL; The popularity of these methods in microprocessor design has decreased in place of CMOS logic.
 
Can I recommend this link http://www.ibiblio.org/kuphaldt/electricCircuits/Digital/DIGI_3.html#xtocid1010712
It's a bit long-winded but covers basic gates pretty thoroughly. In here you will find an exact answer to your question - "all-NAND" (at least, it is there: whether you'll find it, is another matter! I found it, but I knew what I was looking for.)
It covers both xTL and CMOS logic, so whichever type you choose to talk about, the same info is there.

"In reality, how are these circuits made ? Do we just use TTL etc. integrated circuits and combine them as necessary?"
I'm not quite sure what you're getting at here. Of course people do combine ICs as necessary, but I think the "all-NAND" concept is referring to how we design the ICs in the first place.
 
Indeed. Some technologies favour NAND gates. If I remember correctly ECL favours NOR gates.
 
Thanks everyone.
 

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