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About Logic Gates

Logic gates are circuits with electronically controlled switches that combine digital signals according to Boolean algebra. In binary math, bits have only two possible values: 0 (off, false) and 1 (on, true). Consequently, there are three basic logic gates from which all other combinatorial logic functions are generated. Inverters, or NOT gates, have only one input and reverse the logic state. A true input produces a false output, and vice versa. AND gates performs a logical “and” operation on two inputs, A and B. With OR gates, the variable Q equals 1 if A is 1, B is 1, or if both A and B are 1. NOT, AND, and OR logic gates are considered to be functionally complete because they can be used to generate any function. Complex applications use numerous NOT, AND, and OR gates, along with NAND, NOR, XOR, and XNOR gates. 

NAND logic gates serve as an AND gate followed by a NOT gate.  In other words, NAND gates behave like the logical operator “and” followed by negation. The output is false if both inputs are true; otherwise, the output is true. NOR gates behave like the logical operator "or" followed by negation. The output is true if both inputs are false; otherwise, the output is false. XOR gates (exclusive-OR) behave like the logical operator “either / or”. The output is true if either, but not both, of the inputs are true.  The output is false if both inputs are false, or if both inputs are true. XNOR gates (exclusive-NOR) combine an XOR gate followed by an inverter. XNOR gates behave like the logical "either / or", operator followed by negation. The output is true if the inputs are the same, and false if the inputs are different.

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  • Digital Principles & Logic Design
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Engineering Web: Logic Gates

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Logic gate - Wikipedia, the free encyclopedia

Digital Logic
Combinational Logic: [Basic Gates [Derived Gates [The XOR Function [Binary
TI Standard Logic Products &...
TI is your source for Standard Logic ICs including Switches, Translation, I²C, Interface, Little Logic, Gates, Inverters, Flip-Flops, and FIFOs.
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Part Numbers for Logic Gates

Part # Distributor Manufacturer Product Category Description
LOGIC GATE NC7SZ04P5X netCOMPONENTS Not Provided Not Provided Not Provided
LOGIC GATE NC7SZ74K8X netCOMPONENTS Not Provided Not Provided Not Provided
LOGIC GATE NC7SZ86P5X netCOMPONENTS Not Provided Not Provided Not Provided
LOGIC GATE NC7SZ04P5X netCOMPONENTS Not Provided Not Provided Not Provided
LOGIC GATE NC7SZ04M5 S netCOMPONENTS Not Provided Not Provided Not Provided

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