MC74HC251ADR2G

Series:	74HC
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Multiplexer
Circuit:	1 x 8:1
Independent Circuits:	1
Current - Output High, Low:	5.2mA, 5.2mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	2 V ~ 6 V
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	74HC251

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The MC74HC251ADR2G is a logi-signal switch and multiplexer which contains 4 2-input multiplexers with an output enable signal. This signal controls the output state of all the multiplexers and is used to switch between two input data signals. This device is able to handle any two-level digital signal, giving it an extensive range of potential applications.This device is designed for use in a wide range of logic and digital applications. It is primarily used in digital signal multiplexing, switching, and decoding applications. Its main functions are data and address decoding, bus routing, memory buffer control, and the multiplexing of buses and data lines. It is used in peripheral devices, modems, integrated circuits, microcontrollers, and computer CPUs.The MC74HC251ADR2G employs the use of a two-input multiplexer and an output enable signal. It is designed with two data inputs and one output enable input. The two data inputs (A and B) represent the two data signals that the multiplexer is designed to select from. The output enable signal (OE) is associated with the multiplexer and is used to control the output state of the multiplexer. When the OE signal is set to logic "1", the output of the multiplexer is high and presents data A. When the OE signal is set to logic "0", the output of the multiplexer is low and presents data B.The MC74HC251ADR2G uses source-level output enable control, which means that the device selects between the two data inputs solely on the basis of the OE input. This function provides greater power efficiency than other forms of control. The device also has the ability to switch between logic levels, allowing it to be used in higher performance applications.In order to better understand the working principle of the MC74HC251ADR2G, one should consider the circuit diagram of the multiplexer. An example of the circuit consists of an OR gate, an AND gate and a buffer. The A and B inputs represent the two data inputs of the multiplexer and their value is given to the OR gate (gate 1) via the inputs. The output of the OR gate is then fed to the AND gate (gate 2) along with the OE signal. The output of the AND gate is then fed to the buffer that controls the output state of the multiplexer.The multiplexer\'s output is driven by the OR gate, which combines signals A and B. When the output enable (OE) is logic "1" the AND gate passes the output of the OR gate to the buffer, which then provides the multiplexer\'s output. When the output enable (OE) is logic "0", the AND gate either shuts down or inhibits the output of the OR gate. Therefore, when the OE is logic "1", the multiplexer will present data A, and when the OE is logic "0", the multiplexer will present data B.To summarise, the MC74HC251ADR2G is a logi-signal switch and multiplexer used in a wide range of logic and digital applications. This device is designed to switch between two input data signals using an output enable signal. The device uses source-level output control and can switch between logic levels to provide greater power efficiency and better performance. The multiplexer\'s working principle involves the use of an OR gate, an AND gate and a buffer. When the output enable (OE) is logic "1" the multiplexer will present data A, and when the OE is logic "0" the multiplexer will present data B.

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