Similarly, the maximum low voltage level for input is 0. So the voltages less than 0 volts will consider as logic 0, to a TTL device. So when the logic device is supplied with voltages between 0. This is an advanced technology that will run the devices on low power supply 3.
For example, the minimum value for a high logic level 1 of a CMOS device is 2. Because many of the will permanently cause the chip damage when we supply voltages above 3.
We can use a voltage divider circuit or logic level shifters to control the 5 V voltage signals. Back to top. The noise margin of a logic level is defined as the voltage gap between the maximum low voltage of high input VIL max and maximum voltage of the low input VIL min of a logic gate. The noise margin is also defined as the amount by which the voltage signal exceeds the threshold level for the exact high or exact low.
When a logic circuit is altering between 0 volts and 1. And any voltage above 1 volt is considered as HIGH i. CMOS logic devices have higher noise level or noise margin than TTL logic devices because their minimum output voltage for high logic VOH min is closer to the supply voltage and maximum output voltage for low logic VOL max is nearly 0. So the noise level is the maximum amount of noise that a logic circuit can withstand.
If we apply a voltage of certain the noise level, we do not certainly know whether the circuit will respond or not. Noise level is the unwanted voltage level, caused by external interference such as supply voltage fluctuations and other conductors in circuit. For TTL devices the tolerance range of output voltages is higher than that of input voltages.
Diodes can act like switches, so these are used in digital logic operations and switching. For low and high impedance states a diode will work in forward bias and reverse bias. The diode will conduct only in one direction Forward bias and it remains closed in reverse bias condition. So it behaves like a switch. The simple OR gate designed by two diodes is shown in the below figure. Inputs are given to this circuit by the two diodes. Thus the output is logic HIGH i.
The truth table and logic diagram and circuit diagram for the logical OR gate is shown below. The simple AND gate designed by two diodes is shown in the below figure. In this the circuit driving voltage V is connected to the two parallelly connected diodes through a resistor, R.
In the below circuit , the two inputs are left unconnected, so the output is also 0 i. The truth table and logic diagram and circuit diagram for the logical AND gate is shown below. Like diode, transistor also acts as an electronic switch. We can design logic gates using transistors also. It produces the exact reverse output to that of given input. It has only one input and one output.
The output of NOT gate is always the complement of its input. Similarly, if high input signal is connected to the input, then the output will be LOW logic 0.
Thus option 1 is correct. A logic gate follows a logical relationship between input and output voltages. Thus option 3 is incorrect. Logic gates works on truth table Logic gates are used to switch on or off for any instrument Logic gates are used as fuse in electric circuit All are incorrect. Logic gates work on the truth table. It is not the continuous output giving element. But the fuse should work continuously. So statement 3 is wrong.
So option 3 is correct. As the logic gates give only one output. In case of an on or off alarms, we just need only one output, either on or off. That's why the logic gates can be used to on or off the alarm. So statement 2 is correct. The logic gates work on the truth table as shown in the example on the concept part because it can give either yes or no as output. So statement 1 is correct.
It gives a high output if either input A or B or both are high 1 otherwise it gives a low output 0. The correct answer is option 1 i. CONCEPT: Truth table : A truth table is a mathematical table used to represent the output of a given function based on the combination of input variables.
A truth table has two columns : the first column shows the combination of input variables and the last column shows the final output for each input. Logic gate : Logic gates are the basic building blocks of a digital system. Logic circuits perform operations on digital signals and are usually implemented as electronic circuits where the signal values are restricted to a few discrete values.
In binary logic circuits there are only two values, 0 and 1:In decimal logic circuits there are 10 values, from 0 to 9:Since each signal value is naturally. Then how digital logic functions are constructed using those gates. The concept of memory is then introduced through the construction of an SR latch and then a D flip-flop. A clock is created to be used in a basic state machine design that aims to combine logic circuits with memory.
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