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I am currently reversw engineering a PCB and it contains a D-type register chip. The chips internal circuit diagram shows a NOT gate with two bubbles on it both in the front and the back. My question is if this is the same as a buffer or if this case some other meaning? And it would be great if a truth table could be included in the answer.

Datasheet: http://www.ti.com/lit/ds/sdls090/sdls090.pdf

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  • \$\begingroup\$ Truth table is in the datasheet. \$\endgroup\$ Jul 9, 2017 at 17:27
  • \$\begingroup\$ You might want to check this answer as well: electronics.stackexchange.com/a/452460 since it explains the intention behind using the circle before the triangle and therefore also the circle after the triangle. \$\endgroup\$
    – Martin
    Aug 16, 2020 at 14:40

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It is the same as a buffer. The bubble at the input is used to indicate that this input is active low. It drives the input of the reset, which also has a bubble at the input and is therefore also active low.

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