74AHCT138D,112

Series:	74AHCT
Packaging:	Tube
Part Status:	Active
Type:	Decoder/Demultiplexer
Circuit:	1 x 3:8
Independent Circuits:	1
Current - Output High, Low:	8mA, 8mA
Voltage Supply Source:	Single Supply
Voltage - Supply:	4.5 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:	74AHCT138

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Logic - Signal Switches, Multiplexers and Decoders have become an important tool for engineers, technicians and hobbyists in the modern electronic industry. The 74AHCT138D,112 is an example of such a logic device. It is a 1:8 demultiplexer/decoder that is capable of decoding two binary signals. In this article, we will discuss its application fields and how it works.The 74AHCT138D,112 is most commonly used in those applications that require a device to convert two binary signals into eight distinct outputs. This multiplexer/decoder can be used to form a variety of memory structures such as ROM, PROM, and (EE)PROM. Another example would be if one was looking to provide a larger output with two binary signals. In this case, the 74AHCT138D,112 could be used to drive up to eight independent output devices such as LEDs, relays or transistors.The 74AHCT138D,112 utilizes two binary signals, S0 and S1, to control its eight outputs, O0-O7. It is important to note that in order for the multiplexer/decoder to operate, the lower order signal, S0, must first be received. Once it is received, then the second signal, S1, may be applied. The S0 and S1 signals together control the active output from the multiplexer/decoder. The following table shows how the signals control the output given their state:

S1	S0	Active Output
L	L	O0
L	H	O1
H	L	O2
H	H	O3

Given that the 74AHCT138D,112 is a logic device, it utilizes a combination of digital logic gates to decode the binary signals and output the correct active output accordingly. The following block diagram provides a visual representation of the internal circuitry of the device:As seen in the diagram, the active output is selected depending on the state of the two binary signals, S0 and S1. The lower order signal, S0, is applied to one of the four AND gates and the higher order signal, S1, is applied to the other three AND gates. The decoder then determines which output should be active based on the state of the two input signals.The 74AHCT138D,112 is an excellent choice for those looking for a device with the simple yet powerful ability to take two binary signals and output eight distinct signals. Its small form factor makes it extremely versatile, as it can be used in a variety of applications such as ROM, PROM and efficiently driving multiple output devices. With its understanding of the application fields and working principle, those involved in the field of digital electronics or data communication should be better equipped when integrating the 74AHCT138D,112 into their designs and projects.

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