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Why is NAND gate preferred over NOR gate?
In general, cells are designed to have similar drive strength of pull up and pull down structures to have comparable rise and fall time. NAND gate has better ratio of output high drive and output low drive as compared to NOR gate. Hence NAND gate is preferred over NOR.
What is the advantage of NAND gate?
Advantages and Disadvantages of NAND -Cost: NAND is cost-effective per byte and has a high storage capacity for its physical size. -Endurance: NAND cells eventually wear out as their transistors degrade. A NAND chip lasts until it reaches its write-cycle limit, after which it will no longer be able to store new data.
Is NAND faster than AND?
Although in NAND gate pmos are in parallel and in NOR they are in series, so NAND gate is faster than NOR.
What is the Speciality of NAND and NOR gate?
The specialty of NAND and NOR gates is that they are universal gates and can perform all the basic logical operations.
Which is faster NAND or NOR?
Why is NAND gate preffered over NOR gate?
The complexity is represented by the logical effort, g and this defined as ratio of input capacitance of a gate to the input capacitance of an inverter that as same drive strength (i.e. delivers same current). Now let us consider a two inputs NAND gate and NOR gate , both drives a same external load (C out =4).
Which is preferred NAND OR NOR?and why?
The lower the logical effort the better the gate. So a NAND gate is preferred over a NOR gate. If we have two different ways of realizing a boolean function, the type, which has a lower logical effort associated with it, is the better one.
Which is preferred NAND OR NOR in CMOS logic?
A NAND gate is preferred over a NOR gate in implementing CMOS logic because, the area occupied by the NOR gate is larger and the associated capacitance is larger for NOR gate, thereby exhibiting more delay for the circuit. If we have NAND logic then the parallel connection of transistor will increase the capacitance linearly increasing the delay.
What is the equation for delay in NAND?
As you were saying, the equation for delay is Delay = t(gh + p) But the logical effort g for NAND is less than that of NOR. Consider the figure showing 2 input CMOS NAND and NOR gate. The number against each transistor is a measure of size and hence capacitance.