Digital Principles & Logic Design

Appendix 1 - Alternate Gate Symbols

Different types of logic gates and their symbols have been discussed in this book with their applications. However, readers may find alternate gate symbols while referring to other books. The alternate gate symbols are with the circles or bubbles at the inputs. The circles or the bubbles imply that the inputs are complemented first followed by the normal operation of the gates. The following table describes the graphic symbols of these gates and their functions.

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