Question

If four NAND gates each with an average propagation delay of $5 \mathrm{~ns}$ are connected in a serial path with three NOR gates each with a propagation delay of $4 \mathrm{~ns}$, what is the propagation delay of the entire circuit? 

    If four NAND gates each with an average propagation delay of $5 \mathrm{~ns}$ are connected in a serial path with three NOR gates each with a propagation delay of $4 \mathrm{~ns}$, what is the propagation delay of the entire circuit?
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Essentials of Electrical and Computer Engineering
Essentials of Electrical and Computer Engineering
David V. Kerns, Jr.,… 1st Edition
Chapter 14, Problem 12 ↓

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There are four NAND gates, each with a propagation delay of \(5 \mathrm{~ns}\).  Show more…

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If four NAND gates each with an average propagation delay of $5 \mathrm{~ns}$ are connected in a serial path with three NOR gates each with a propagation delay of $4 \mathrm{~ns}$, what is the propagation delay of the entire circuit?
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Key Concepts

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Propagation Delay
Propagation delay is the time interval between a change in the input of a gate (or circuit) and the corresponding change at its output. This parameter is critical in determining the speed of digital circuits, as it directly affects the overall performance and timing reliability of electronic systems.
Series Connection of Components
When digital circuit components like logic gates are connected in series, the individual delays of each gate add up to form the total delay of the path. This cumulative delay dictates the maximum speed at which the circuit can operate, as the longest delay path determines the system’s operational timing.
Digital Logic Gates
Digital logic gates, such as NAND and NOR gates, are fundamental building blocks used to perform logical operations in electronic circuits. Each type of gate has inherent characteristics, including its own propagation delay, which must be considered when analyzing and designing digital systems.
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