74AHC139D,118 Integrated Circuits (ICs)

Series:	74AHC
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Decoder/Demultiplexer
Circuit:	1 x 2:4
Independent Circuits:	2
Current - Output High, Low:	8mA, 8mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	2 V ~ 5.5 V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SO
Base Part Number:	74AHC139

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Introduction

The 74AHC139D,118 is a logic integrated circuit (IC) used to combine multiple signal lines into one or more output lines. It is commonly referred to as a "multiplexer", "decoder", or "switch". This particular model of the 74AHC139D is designed to be used as a signal switch and has a wide range of applications used in many industries.

Applications

The 74AHC139D,118 is typically used in systems that require the selection of fewer than or equal to 8 input lines, and the switch can operate with both digital and analog signals. Some of the most common applications of the 74AHC139D,118 are:

• Amplifier switching
• Data multiplexing/ demultiplexing
• Keyboard and display interface
• Sensor control
• Signal routing
• Synchronus counter decoding.

The 74AHC139D,118 can also be used in hardware-level security such as in ATM machines and other electronics devices.

Working Principle

The 74AHC139D,118 works on a simple principle. It receives two control inputs and 8 data inputs. Depending on the condition of the two control inputs, either one of the two data inputs will be connected to the output lines. The 74AHC139D,118 is composed of two 4-channel multiplexer circuits with an enable signal to select which multiplexer circuit is active. The first circuit is enabled when the enable signal is low, making it possible to select one of four data inputs and then output it on the common line. The second circuit is enabled when the enable signal is active, and can also select one of four data inputs and send it to the output line. When both the first and second enable signals are active, the 74AHC139D will select the data value that is being sent from the corresponding multiplexer circuit, and output it on the common line. This allows the 74AHC139D to act as a signal switch and combine multiple signal lines into one line.

Conclusion

The 74AHC139D,118 is a versatile device that can be used in many electronics projects. It is a signal switch that can be used in applications such as amplifier switching, multiplexing/ demultiplexing, keyboard and display interface, sensor control, signal routing, and synchronus counter decoding. It can also be used in hardware-level security. The 74AHC139D,118 works by receiving two control inputs and 8 data inputs and selecting the appropriate data value and outputting it on the common line.

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