For input digital waveforms A, B and C and a circuit with an upper AND gate, lower NAND gate, and OR output, what waveform is produced at y?
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Question

For input digital waveforms A, B and C and a circuit with an upper AND gate, lower NAND gate, and OR output, what waveform is produced at y?

G1 Physics · Accepted Answer

Upper gate: Y₁ = A·B. Lower NAND gate: Y₂ = NOT(B·C). OR output: Y = A·B + NOT(B·C). For the supplied input timeline the intervals always satisfy at least one of these terms, so output is high in all intervals. Final answer: Option C, constant +5 V.