74F139SJ

Series:	74F
Packaging:	Tube
Part Status:	Obsolete
Type:	Decoder/Demultiplexer
Circuit:	1 x 2:4
Independent Circuits:	2
Current - Output High, Low:	1mA, 20mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Supplier Device Package:	16-SOP
Base Part Number:	74F139

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The 74F139SJ Signal Switch

The 74F139SJ is a logic chip, specifically a device called a 2-line to 4-line active-low decoder which belongs to a family of logic devices known as signal switches, multiplexers, and decoders. The 74F139SJ is part of the Fairchild Semiconductor 74F series of TTL (Transistor-Transistor Logic) devices and is also known as a multiple-input address decoder.In digital electronics, a signal switch is a device which is used to connect different electronic signals to each other. The basic component of a signal switch is a transistor, but there are many different types of signal switch including analog and digital. Digital signal switches are used to control the flow of digital signals by providing a certain output whenever a certain input is presented. The 74F139SJ is one example of a digital signal switch, but there are many other types of signal switches such as multiplexers, decoders, encoders, and latches.The 74F139SJ is a dual 2-to-4 line active-low decoder. The two 2-line digital inputs A and B determine which of the four output lines is activated. The output lines YA, YB, YC, and YD correspond to the binary numbers 00, 01, 10, and 11 respectively. The YA output activates when the A and B inputs are both low, while the YB output activates when only the A input is high. The YC output activates when only the B input is high and the YD output activates when both the A and B inputs are high. The 74F139SJ is most commonly used in communication systems for controlling the flow of digital signals between multiple devices. It can also be used for interfacing peripherals to microcontrollers and for routing address and data bus signals between different circuits. It is widely used in embedded systems, instrumentation, and data acquisition systems. The 74F139SJ is an active-low device, meaning that the output signal is active when the inputs are low and inactive when the inputs are high. This type of logic is also known as negative logic and is often used in logic circuits since it uses fewer components and offers faster performance than positive logic.To summarize, the 74F139SJ is a signal switch belonging to a class of logic devices known as multiplexers, decoders, and signal switches. It is a dual 2-to-4 line active-low decoder which is most commonly used for controlling the flow of digital signals between multiple devices, interfacing peripherals to microcontrollers, and routing address and data bus signals between different circuits. The 74F139SJ uses negative logic, meaning that the output is active when the inputs are low and inactive when the inputs are high.

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