Query

[ANUJ RAWAT]

Ideally, we say that there can be any number of inputs to a logic
gate.But in real, we should have not more than 4 or 5 inputs.Why??
If someone knows, please answer it as soon as possible......

[anshul singhal]

hi,

Answer: To limit the height of the stack. The higher the stack the
slower the gate will be. In NAND and NOR gates the number of gates
present in the stack is usually same as the number of inputs plus one.
So inputs are limited to four.

Thanks & Regards,
Anshul Singhal

[amit bharti]

Hello,

Fan-in is the number of identical inputs the circuits can handle. For instance the fan-in for the AND gate shown below is 3. Physical logic gates with a large fan-in tend to be slower than those with a small fan-in, because the complexity of the input circuitry increases the input capacitance of the device.

Normally delay increases following a quadratic function of fan-in.

Thanks and Regard
Amit Kumar Bharti

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  Thanks and Regard
   Amit Kumar Bharti