Actions
Forum Thread Details
  • Replies 2 replies
  • Subscribers 177 subscribers
  • Views 401 views
  • Users 0 members are here
Related

Pinout on 555/Linear devices

autodeskguest

I'm wondering why the pinout on the all the 555 timers in the linear

library reads (anti-clockwise): 2,4,5,1,8,6,7,3 - as opposed to

1,2,3,4,5,6,7,8?

 

Thanks

 

--

I'm trying a new usenet client for Mac, Nemo OS X.

You can download it at http://www.malcom-mac.com/nemo

 

 

  • J_ADT wrote:

    I'm wondering why the pinout on the all the 555 timers in the linear

    library reads (anti-clockwise): 2,4,5,1,8,6,7,3 - as opposed to

    1,2,3,4,5,6,7,8?

     

    Thanks

     

     

     

    A schematic symbol is normally drawn such that the pin layout makes sense

    for drawing the schematic, ideally with a left to right signal flow.  The

    physical pin layout is irrelevant.

     

    The situation is pretty much the same for every IC. Perhaps your confusion

    arises in this case as the symbol is drawn with a similar structure to the

    physical part, whereas with an op amp or more complex IC it may not cross

    your mind.

     

    David

     

     

  • I'm wondering why the pinout on the all the 555 timers in the

    linear library reads (anti-clockwise): 2,4,5,1,8,6,7,3 - as opposed

    to 1,2,3,4,5,6,7,8?

     

    Perhaps your confusion arises in this case as the symbol is drawn

    with a similar structure to the physical part, whereas with an op amp

    or more complex IC it may not cross your mind.

     

    Good point - thanks.

     

     

    --

    I'm trying a new usenet client for Mac, Nemo OS X.

    You can download it at http://www.malcom-mac.com/nemo