Question about IC's and equivalent circuits

Discussion in 'General Electronics Chat' started by hunterage2000, Feb 1, 2014.

  1. hunterage2000

    Thread Starter Active Member

    May 2, 2010
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    Can anyone tell me how an IC's equivalent circuit be found? i.e. 555 timer, digital gates, vregs, vrefs etc.

    The books I have show a diodes, op amps, bjt and fet's equiv circuit.
     
  2. paulktreg

    Distinguished Member

    Jun 2, 2008
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    Don't think you'll get the actual equivalent circuit for an integrated circuit because it'd be way too complicated. The best you can probably do is some sort of block diagram for the 555, for example, here on the datasheet. The device datasheet will contain all the information you're likely to need.
     
  3. ramancini8

    Member

    Jul 18, 2012
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    In older circuits like the 555, if you get a copy of the first data sheet it usually will give a transistor circuit diagram. This schematic is only representative; the actual circuit is proprietary.
     
  4. ScottWang

    Moderator

    Aug 23, 2012
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  5. redplaya

    Member

    Jan 26, 2014
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    Are you talking about circuit schematic (you confused me with the BJT part) or actual junction layout. Because you will rarely find the PN junction layout (even if circuit is patented) but you may get the 'actual' circuit schematic if they have a patent. Otherwise what they show you in the datasheet is macro perspective (enough to properly engineer how to interface it).
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Before the advent of IC's, or until the cost came down and they became plentiful, the only way to build a circuit was with discrete semiconductors.
    IOW, if you wanted a timer or a flip-flop, Schmidt trigger, ring counter, ultra sonic oscillator, they were all done with discrete transistors.
    To this end, there were a series of books published in the 60's etc, mainly by Sams Publishing and others.
    One was Industrial Transistor Circuits by Allan Lytel.
    I don't know if you can get any old copies of these anymore, but they most likely would give you what you are looking for?
    Max.
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I notice there are a few on Abebooks clearing house, one located in Abingdon, Oxford.
    Max.
     
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