Subelement E: Digital Logic— Topic 35: Logic Levels
Question 3-35E4
Element 3 (GROL)In a positive-logic circuit, what level is used to represent a logic 1?
Explanation
In positive-logic circuits, the convention dictates that a higher voltage potential, or "high level," is used to represent a logic 1. This is the most common interpretation in digital electronics, where a specific voltage range is assigned to a logical "true" state.
Conversely, in positive logic, a lower voltage potential, or "low level" (B), would represent a logic 0. If the circuit were designed using *negative* logic, then a low level would represent a logic 1. Options C and D, "positive-transition level" and "negative-transition level," refer to changes in voltage over time—a rising or falling edge, respectively—which are critical for timing and triggering events, but they do not define the static voltage level that represents a logic 1 or 0.
Related Questions
3-35E2 For the logic input levels shown in Figure 3E12, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.)3-35E3 For the logic input levels given in Figure 3E13, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.)3-35E5 Given the input levels shown in Figure 3E14 and assuming positive logic devices, what would the output be?3-35E6 What is a truth table?3-36E1 A flip-flop circuit is a binary logic element with how many stable states?