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Integrated-Circuit Logic Families - Technical MCQs

Q1:

What type of circuit is represented in the given figure, and which statement best describes its operation?

A It is a tristate inverter. When the ENABLE input is HIGH, the output is effectively an open circuit—it is neither LOW nor HIGH.

B It is a programmable inverter. It can be programmed to function as either an active LOW or an active HIGH inverter.

C It is an active LOW buffer, which can be turned on and off by the ENABLE input.

D None of the above.

ANS:A - It is a tristate inverter. When the ENABLE input is HIGH, the output is effectively an open circuit—it is neither LOW nor HIGH.

Yes, A is the correct answer because in a tristate buffer there would only be a HIGH or LOW output is it is enabled.

Since, in this circuit the input of Enable is inverted when the value is HIGH it would be inverted to LOW hence output would not be enabled and output would be HIGH IMPEDANCE or an OPEN CIRCUIT.