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I'm analyzing the schematics of Lenovo_G530_N500_-_COMPAL_LA-4212P_JIWA3_JIWA4_-_REV_1.0Sec. I have across scenarios where there is a circle next to a component pin. What does this circle symbolize? I have attached the screen shot for my question.

screenshot of part of a schematic

I have tried looking for a proper answer on the internet, but no satisfactory answer found.

SamGibson
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Anupreet Singh
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    It usually denotes active low signals. circle is similar to the circle seen in *NOT* gates. – AJN Jul 04 '20 at 11:52

1 Answers1

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The circle denotes that the pin is of type Active Low.

https://en.wikipedia.org/wiki/Logic_level#Active_state tells that it is also indicated by

a trailing #

AJN
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  • https://books.google.co.in/books?id=clhdDwAAQBAJ&pg=PA22&lpg=PA22&dq=active+low+chip+circle&source=bl&ots=qo4h9PZV8t&sig=ACfU3U0yisUWrckGdJVVHfGPtAcJlVmuKw&hl=en&sa=X&ved=2ahUKEwiVnL3mxLPqAhWymOYKHUNEBpEQ6AEwCXoECAkQAQ#v=onepage&q=active%20low%20chip%20circle&f=false according to this text book, the circle indicates *logical inversion*. – AJN Jul 04 '20 at 12:06
  • https://electronics.stackexchange.com/q/288777/238590 – AJN Jul 04 '20 at 12:10
  • https://electronics.stackexchange.com/q/60401/238590 – AJN Jul 04 '20 at 12:11