Similarly, the maximum low voltage level for input is 0.8 volts. This means, when the device is driving HIGH, the voltage should be less than 0.4 volts. In the same way, the maximum LOW voltage level for output is 0.4 volts. The voltages between 0.8 volts and 2 volts are known as noise margin. So the voltages greater than 2 volts will considered as logic 1, to a TTL device. Similarly, the minimum high voltage level for input is 2 volts. This means, when the device is driving HIGH, the voltage should be at least 2.7 volts.

If we observe the TTL logic levels, we can observe that the minimum high voltage level for output is 2.7 volts. Input voltage level of a device to be considered for LOW signal input voltage level of a device to be considered for HIGH signal Transistors are electrically controlled switches. TTL logic level is the standard logic level for majority of the logic devices. to 3.3 or 5 volts supply, in order to enable the pin. Otherwise, if we see the enable pin with a line on it as (CE) М…, we connect it to the active high input i.e. When we see the enable pin CE in a shift register IC, without any line (bar) on it, we connect it to active low input i.e. LetвЂ™s understand about this in a simple way. In the same way, the Active high pin must be connected to high logic level or to 5 volts or 3.3 Volts. This means the Active low pin must be connected to low logic level or Ground. Do you know what they really mean? They just describe us how the pin is getting activated. We see the active high input and active low input pins in ICs and micro controllers. The manufacturers will follow the TTL or Transistor вЂ“ Transistor Logic as standard voltage level, while designing the ICs. Similarly, if the supply voltage to the logic gate is 5 volts or 3.3 volts (for modern ICs), it refers to High logic level or ON state. If the supply voltage to the logic gate is 0 volts, it refers to Low logic level or OFF state. As we said earlier, the logic levels are introduced to the logic gate by the supply voltage.

Generally these logic levels can be understand as ON and OFF states. In digital electronics, these binary logic levels play a crucial role in data storage, data transfer. The logic levels 0 and 1 are known as LOW and HIGH respectively. We know that 0 and 1 are the two states of logic gates. Digital logic levelsДЄ logic level is defined as a specific state or voltage of a signal. We can also perform complicated operations at high speeds by using integrated circuits (IC).Д«y combining logic gates, we can design many specific circuits like flip flops, latches, multiplexers, shift registers etc. Practically, we implement the large number of logic gates in ICs, by which we can save the physical space occupied by the large number of logic gates. We can connect any number of logic gates to design a required digital circuit. The low logic level represents Zero volts and high logic level represents 3 or 5 volts positive supply voltage. The inputs of the logic gates are designed to receive only binary data (only low 0 or high 1) by receiving the voltage input. Some logic gates like NOT gate or Inverter has only one input and one output. Logic gates are the basic building block of digital circuits.Д«asically, all logic gates have one output and two inputs. A gate is an electronic device which is used to compute a function on a two valued signal. Logic gates are the heart of digital electronics.

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