MC74ACT257DG

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The MC74ACT257DG is a Quad 2-Input Multiplexer that provides a 1-of-4 data select capability. It is a single-gate logic circuit that offers an overall signal delay of as low as a single clock cycle. This signal switch is designed to operate using an active-low select (S) signal and two independent data inputs (A0, A1) that enable it to select one of its four data outputs (Y0 – Y3). The multiplexer can address both the access time and speed performance criteria to produce the best possible combination of the two. Its pinout diagram is shown below.

Applications

The MC74ACT257DG multiplexer has numerous potential applications. These include:

• Video and multimedia circuit components
• Digital signal processing (DSP) applications
• Image processing circuits
• Voice and video communications system components

The multiplexer’s low delay in switching signals makes it ideal for applications where fast signal switching is needed. Examples of such applications are digital logic circuits, television signal processors and computer-related components.

Working Principle

The MC74ACT257DG multiplexer functions according to the following principles:

1. The select (S) signal is the control signal for the multiplexer. A low value of S causes the multiplexer to select output Y3 and a high value causes it to select Y2.
2. Two independent data input signals (A0, A1) are used to select from among the 4 data outputs (Y0 – Y3). A logic 0 value for A0 and A1 causes the multiplexer to select data output Y0 and returning logic 1 values for both A0, A1 causes the multiplexer to select Y3.
3. The multiplexer produces an active output signal if the conditions of step 1 and/or 2 are met. The signal is valid only while the conditions remain true.
4. The signal delay between the select (S) and the active output is only a single clock cycle.
5. The signal level of the output is determined by the logic level of the input signals. An active output is produced if the logic level of the two data inputs is the same – and vice-versa.

The MC74ACT257DG multiplexer provides a fast, reliable signal-switching solution in a wide variety of applications. Its low signal delay and ability to switch complex electrical signals enable it to be readily integrated into any circuit, providing significant performance benefits.

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