The threshold level for logic 1 in the TTL family is

1998

The threshold level for logic 1 in the TTL family is

Answer: D. any voltage below VCC but above 2.8 V — TTL circuits normally operate with VCC around 5 V. A logic-1 level is a valid HIGH voltage, so it must be near the upper supply range and must not include the…

  1. A.

    any voltage above 2.5 V

  2. B.

    any voltage between 0.8 V and 5.0 V

  3. C.

    any voltage below 5.0 V

  4. D.

    any voltage below VCC but above 2.8 V

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Correct answer: D

TTL circuits normally operate with VCC around 5 V. A logic-1 level is a valid HIGH voltage, so it must be near the upper supply range and must not include the low or uncertain voltage region.

Among the given options, the most precise TTL logic-1 range is a voltage below VCC but above about 2.8 V.

Therefore, the correct answer is option D.

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