What should be done to unused inputs on TTL gates?
A) All unused inputs should be connected to an unused output; this will insure compatible loading on both the unused inputs and unused outputs.
B) All unused gates should be connected together and tied to Vcc through a 1k- ohm resistor.
C) They should be left disconnected so as not to produce a load on any of the other circuits and to minimize power loading on the voltage source.
D) Unused AND and NAND inputs should be tied to Vcc through a 1k- ohm resistor; unused OR and NOR inputs should be grounded.

Question

Quizplus · Accepted Answer

Unused TTL gate inputs should not be left floating because they can pick up noise and switch unpredictably, leading to increased power consumption and possible malfunction of the circuit. Connecting unused AND and NAND inputs to Vcc ensures they are in a high state, effectively removing them from influencing the gate's output. Similarly, grounding unused OR and NOR inputs ensures they do not affect the gate's output. This practice minimizes power consumption and prevents unintended behavior.

What Should Be Done to Unused Inputs on TTL Gates