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This behavior is both correct and expected. The input stage of a TTL device acts as a current sourceacts as a current source, so some voltage will always be present except on a short to ground.

R12 should tie the input to Vcc, and there should be no (or at least a much smaller) resistance in series with the swtich.

This behavior is both correct and expected. The input stage of a TTL device acts as a current source, so some voltage will always be present except on a short to ground.

R12 should tie the input to Vcc, and there should be no (or at least a much smaller) resistance in series with the swtich.

This behavior is both correct and expected. The input stage of a TTL device acts as a current source, so some voltage will always be present except on a short to ground.

R12 should tie the input to Vcc, and there should be no (or at least a much smaller) resistance in series with the swtich.

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Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams
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This behavior is both correct and expected. The input stage of a TTL device acts as a current source, so some voltage will always be present except on a short to ground.

R12 should tie the input to Vcc, and there should be no (or at least a much smaller) resistance in series with the swtich.