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- Logic Gates
- What is the difference between positive and negative logic in digital I/O circuits?
- Pulse and Digital Circuits by

*Classical and Quantum Computing pp Cite as. A digital electronic system uses a building-block approach.*

Thus, the more positive voltage causes the action to take place. On the other hand, if a circuit requires a logic 0 to cause action, this type circuit is referred to as negative logic. There is nothing negative or positive about these various circuits. The notation simply provides a shorthand that tells engineers and users whether a logic 1 or a logic 0 causes an action. The relay outputs are configured for positive logic by default, meaning that the relays are in the open or reset position and logic 1 must be written to close or set the relays.

If the relays are configured for negative logic through Windows Device Manager , then logic 0 would be written to close or set the relays. Optically isolated inputs are also configured for positive logic by default, meaning that the inputs report logic 1 when a voltage is applied across the contacts. If the inputs are configured for negative logic through Windows Device Manager , then logic 0 would be reported when a voltage is applied across the contacts.

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Positive logic: If the signal that activates the logic gate has for its high 1 level a voltage more positive than for its low 0 level then the polarity of the logic is called positive logic, as shown in Fig. Negative logic: If the signal that activates the logic gate has for its high 1 level a voltage more negative than for its low 0 level then the polarity of the logic is called negative logic, as shown in Fig. Logic circuit conversion: A circuit using a positive negative logic can be converted into a circuit performing the same logic function but with a negative positive logic by following the procedure listed below. Skip to main content. Pulse and Digital Circuits by. Start your free trial.

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Top-down design process for gate-level combinational logic design Abstract: A pedagogical process for designing gate-level combinational logic circuits is described. The process can be used for either combinational logic circuits or the combinational logic sections of sequential logic circuits.

Thus, the more positive voltage causes the action to take place. On the other hand, if a circuit requires a logic 0 to cause action, this type circuit is referred to as negative logic. There is nothing negative or positive about these various circuits. The notation simply provides a shorthand that tells engineers and users whether a logic 1 or a logic 0 causes an action. The relay outputs are configured for positive logic by default, meaning that the relays are in the open or reset position and logic 1 must be written to close or set the relays.

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## 1 Comments

## Dyonis B.

Negative Logic Theorem: A combinational network which realizes a function F when variables are defined using positive logic will realize the dual function FD.