MC74LCX139D

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The MC74LCX139D is a Dual 1-of-4 Decoder/Demultiplexer, designed to be used as a 2-to-4, 4-to-2 or 1-of-4 decoder/demultiplexer. This device is packaged in a variety of packages, including the SOIC, PDIP and PLCC. The device is able to deliver a wide range of applications, including but not limited to logic switching, multiplexing, demultiplexing and decoder/demultiplexers.

The MC74LCX139D is composed of two separate individually programmable channels, each with 4-inputs and 1-output. The outputs of the channels can be individually selected by the 2-bit binary select inputs, A and B. The outputs from each channel are activated in response to the active SELECT inputs and will remain active until the SELECT inputs are changed. When both channels are running simultaneously, the outputs of each channel are connected together, creating an 8 output multiplexer. The outputs are then processed through an internal gate in order to ensure proper logic level translation.

The most common application of the MC74LCX139D is in the form of a 4-to-2 or 2-to-4 circuit. In the 4-to-2 circuit, the MC74LCX139D provides an extremely efficient solution, as switching between two sets of signals (each signal being 4 bits) can be achieved quickly with just two 2-bit binary select inputs. This is particularly useful when the signals need to be multiplexed to a single output signal, such as in video and audio applications.

In the 2-to-4 circuit, the MC74LCX139D allows for four separate outputs to be created from the same two input signals. This is useful if four separate functional signals are needed to be used in a single system. It can also be used to convert an existing serial signal for parallel data processing.

The working principle behind the MC74LCX139D is straightforward but effective. The two SELECT inputs, along with the four data inputs, control the action of the device. When the SELECT lines are activated, the outputs of the device will take on the state of the data inputs. If the SELECT lines are changed, then the outputs will take on the state of the new data inputs provided they are the same as the previous inputs. It is important to remember that the device is a ‘true’ device, meaning that if the SELECT lines are not active then the outputs will be ‘high-impedance’ and no logic will be driven.

Overall, the MC74LCX139D is an incredibly powerful device for logic switching, multiplexing, demultiplexing and decoder/demultiplexers applications. It is housed in a range of packaging options, from SOIC, PDIP and PLCC, making it easy to implement in your own design. It is simple, yet effective working principle combined with its wide range of applications make it the perfect choice for any design requiring the efficient switching of multiple signals.

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