A NOT gate outputs a high when the input is which?

A NOT gate outputs a high when the input is which?

• A. True
• B. False
• C. Indeterminate
• D. High Impedance

Answer: (B)

An inverter flips the logic level: a low input becomes a high output, and a high input becomes a low output. So to get a high on the output, the input must be low (false). If the input is high (true), the output is low. States like indeterminate or high impedance aren’t defined inputs for normal digital operation, so they don’t reliably produce a high output.

An inverter flips the logic level: a low input becomes a high output, and a high input becomes a low output. So to get a high on the output, the input must be low (false). If the input is high (true), the output is low. States like indeterminate or high impedance aren’t defined inputs for normal digital operation, so they don’t reliably produce a high output.