MC74VHC138DTR2

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The MC74VHC138DTR2 is an 8-bit decoder/demultiplexer part in the VHC4000 family from ON Semiconductor. It is a 3-state device, and is available in a 16-pin DIP package. The part has two main functions: it can be used as a 1-of-8 decoder, and it can be used as a multiplexer/demultiplexer. In both functions, it can operate at a wide range of supply voltages, from a minimum of 4V up to a maximum of 10V.

In its decoder mode, the MC74VHC138DTR2 has eight inputs, which can be either logic high (1) or logic low (0). These inputs are combined and used to select one of the eight outputs, which will be at logic high (1), while the other outputs are all at logic low (0). In multiplexer mode, the inputs are used to select which one of the eight inputs should be connected to the single output. In this case, the output will be set to match the input that has been selected.

The MC74VHC138DTR2 has a number of features to ensure reliable operation. It has an active low enable input, which is used to enable or disable the decoder or multiplexer functions. This helps to minimize noise and power consumption. The part also has output enable inputs, which can be used to enable or disable individual output lines. The output enable inputs are active low, and can also be used to turn off any unused outputs.

The MC74VHC138DTR2 can be found in a variety of applications, including interface and control circuitry, data acquisition systems, digital display systems, and other digital logic circuits. It is a versatile part that can be used either as a decoder or multiplexer, depending on the requirements of the application.

In summary, the MC74VHC138DTR2 is an 8-bit logic part, allowing the user to create a decoder or multiplexer function, depending on the requirements of the application. Its wide range of supply voltages makes it suitable for a variety of applications, including interface and control circuitry, data acquisition systems, digital display systems, and other digital logic circuits.

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