74AHCT138D,118

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Logic-Signal Switches, Multiplexers, Decoders are digital electronic components with a variety of applications. One such electronic component is the 74AHCT138D,118. This article will discuss the application field and working principle of this component.

The 74AHCT138D,118 comprises of 3-to-8 line decoder/demultiplexer which belongs to a high-speed CMOS logic family and is pin-programmable to decode four-bits to eight lines. The 74AHCT138D,118 simultaneously selects one data line from the 8 data lines.

The 74AHCT138D,118 is commonly used in variety of applications such as computer memory address decoding, control logic systems and data transmission. It is also used in logic interfacing, keyboard scanning, display decoding, serial data processing and other data transmission applications.

The working of 74AHCT138D,118 is fundamentals of CMOS logic and the operation is highly depend on signals present at the address ports in order to perform its functions. The design of 74AHCT138D,118 contains CMOS technology which can be operated over a wide range of supply voltages from 3.0V up to 15.0V. The 74AHCT138D,118 also features two low power consumption modes of operation, the power dissipation of which is only 3.2 µW and 1.2 µW respectively.

The control inputs of 74AHCT138D,118 are complexly interlinked with the data input lines and the output components. The output components consist of the Y0–Y7 lines and the E line, which together comprise the output of decoder/demultiplexer. The 74AHCT138D,118 also provides a low power consumption level as it allows its output to be placed in HI-Z state. In this state, even when the input signals are static in nature, power consumption is minimized drastically.

When a 74AHCT138D,118 is used as a decoder, it is necessary to connect the lower 4-bits of the address lines to A0-A3. This part of the address will be used to select the data lines for output. Similarly, when the 74AHCT138D,118 is used as a demultiplexer, the lower 3-bits of the address line are connected to A0-A2, as the 4th bit of the address line is used as the select input. The select input is connected to the E line, which controls the selection of input from the 8 data lines.

The 74AHCT138D,118 employs a set of complex combinational logic equations for generating the output signals. Every output signal is calculated using a set of input that the user provides. In a decoder/demultiplexer, the output of the system depends on the contents of the address and the select inputs. The output signals are affected only when the address and the select inputs are in their respective active state. Furthermore, even if the input signals are static in nature, the output is forced to its low power state due to the HI-Z state feature, which minimizes the power consumption considerably.

The 74AHCT138D,118 provides an efficient and simple way to decode or demultiplex data. It is widely used in a large variety of applications in the fields of computer memory address decoding, control logic systems, data transmission and many more. It features a high-speed operation and low power consumption levels, thus making it an optimal choice for digital electronic systems.

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