Question for those familiar with IIL (integrated injection logic)

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Discussion Overview

The discussion centers around the operation and understanding of Integrated Injection Logic (IIL) circuits, specifically focusing on the function of a transistor with a grounded base within an IIL cell. Participants explore various aspects of IIL, its relevance, and seek clarification on its components.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses understanding of the operation of the second transistor in the IIL cell but seeks clarification on the role of the transistor with a grounded base, questioning if it functions as a voltage regulator.
  • Another participant suggests that IIL is outdated and questions its relevance, recommending a focus on more modern logic families like CMOS.
  • A different participant asserts that IIL has applications and requests further information, indicating a belief in its continued relevance.
  • One participant proposes that the confusion may stem from a potentially incorrect diagram of the IIL circuit, suggesting a comparison with external resources for clarity.
  • Another participant mentions uncertainty regarding the purpose of the transistor and notes that the circuit diagram in question is not incorrect, referencing the availability of similar images online.
  • A participant speculates that if the transistor acts as a current source, it could imply that the circuits being discussed are equivalent.
  • One participant reiterates their confusion about the transistor's function after reviewing an external article, emphasizing the need for clarification.

Areas of Agreement / Disagreement

Participants express differing views on the relevance of IIL, with some questioning its importance in modern contexts while others defend its applications. There is no consensus on the specific function of the transistor with a grounded base, as participants continue to seek clarification.

Contextual Notes

There are indications of uncertainty regarding the accuracy of the circuit diagram and the specific roles of components within the IIL cell. Participants reference external sources but do not reach a definitive understanding of the transistor's function.

FOIWATER
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Attached is a picture of IIL (integrated injection logic) cell. I understand the operation of the second (bottom-most) transistor, and analysis of digital circuits is adequate only understanding the operation of this transistor.

I do not understand the operation of the transistor with grounded base. Does it act as some sort of voltage regulator?

Any information, is appreciated.
 

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I don't know the answer to your question, but FWIW, I don't think anybody uses IIL anymore. It was conceived back in the 1970's, and CMOS logic has come so far since those days that I don't know why anyone would care about IIL. Perhaps your question is just intellectual curiosity, but if you are learning about logic families I would suggest focusing elsewhere.
 
I have received almost an identical response regarding a CMOS inquiry.

IIL has its applications, any information is appreciated.
 
I read that article and still wasn't sure what the transistor is for.

It isn't wrong - do a google search for images on IIL, you will get as many or more hits of the circuit I posted.
 
In fact, if it acts as a current source, they would be the same circuit.

any one know if that is the case
 
FOIWATER said:
I read that article and still wasn't sure what the transistor is for.

It isn't wrong - do a google search for images on IIL, you will get as many or more hits of the circuit I posted.
The only one I see is the one from AlephZero's link.
 
how about the one I've attached.
 

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