Digital Electronics - Logic Families and Their Characteristics - Discussion

Discussion :: Logic Families and Their Characteristics - General Questions (Q.No.5)

5. 

What should be done to unused inputs on TTL gates?

[A]. 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.
[B]. All unused gates should be connected together and tied to V through a 1 k resistor.
[C]. All unused inputs should be connected to an unused output; this will ensure compatible loading on both the unused inputs and unused outputs.
[D]. Unused AND and NAND inputs should be tied to VCC through a 1 k resistor; unused OR and NOR inputs should be grounded.

Answer: Option D

Explanation:

No answer description available for this question.

Emmanuel said: (May 17, 2014)  
Why? I thought for AND gates a pull up resistor is needed.

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