Digital Logic Gate
Logic AND Gate Tutorial
An AND right of entry accepts two input signals. If the two input values for an AND confession are both 1, the output is 1; instead, the output is 0.
Fig-1: Logic AND Gate symbol
Two-input AND GATE
An AND gate may be a logic circuit having 2 or additional inputs and one output. The output of AN AND gate is HIGH only all of its inputs square measure within the HIGH state. altogether alternative cases, the output is LOW. once taken for a positive logic system, this implies that the output of the AND gate may be a logic ‘1’ only all of its inputs square measure in logic ‘1’ state. altogether alternative cases, the output is logic ‘0’. The logic image and truth table of a two-input AND gate square measure shown in Fig-1 and Fig-2 severally.
Fig-3: 2 Input AND gate IC configuration
Fig-2: Two-input AND gate
Fig-4: 2-input AND Gate output waveform
Two-input Transistor AND Gate
A simple two-input logic gate is often made exploitation RTL Resistor-transistor switches connected along as shown below with the inputs connected on to the semiconductor unit bases. each transistor should be saturated “ON” for AN output at Y.
Fig-5: 2 input Transistor AND Gate
Three-input AND GATE
Fig-6: 3-input AND gate
Fig-7: 3-Input AND gate IC configuration
Fig-8: 3-input AND Gate output waveform
Three-input Transistor AND Gate
A simple Three-input logic gate is often made exploitation RTL Resistor-transistor switches connected along as shown below with the inputs connected on to the semiconductor unit bases. each transistor should be saturated “ON” for AN output at Y.
Fig-9: 3 input Transistor AND Gate
Commonly available digital logic AND gate IC Number:
TTL Logic AND Gate
74LS08 Quad 2-input IC Pin number 14
74LS11 Triple 3-input IC Pin number 14
74LS21 Dual 4-input IC Pin number 14
TTL Logic AND Gate
CD4082 Dual 4-input IC Pin number 14
CD4081 Quad 2-input IC Pin number 14
CD4073 Triple 3-input IC Pin number 14