SN74ALS157AD

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Logic - Signal Switches, Multiplexers, Decoders

The SN74ALS157AD is a commonly used device employed to switch digital information from multiple sources to a single destination. It is a multiplexer, which provides a way to quickly choose from a number of inputs, and switch the output to the chosen input. As part of the ALS family of devices from Texas Instruments, this device is specially designed to provide speeds up to 54MHz and also improve power-switching efficiency.

Application Field of SN74ALS157AD

The primary application of a multiplexer is that it allows a single port to access multiple input sources, and vice versa. This type of circuit is usually used in situations where information needs to be selected from different sources or when multiple outputs need to be connected or isolated from one or more input sources. In a sense, it can be thought of as a type of switch which can quickly choose from a number of inputs, and switch the output to the chosen input. This is the primary application of SN74ALS157AD.

Although the SN74ALS157AD is primarily used for switching digital information, it is also employed in a wide variety of other applications. It is capable of carrying out analogue performance functions such as creating customised waveforms or amplifying signals. It can also be used in audio applications such as in radio modulation, audio multiplexing and audio amplifiers. Furthermore, it can be effectively employed in lighting and display control applications, in addition to its regularly used general switching functions.

Working Principle

The SN74ALS157AD is an 8 mux device that can select one of eight on-board inputs and connect it to the output. This can be achieved using a few simple pins. It has 8 input pins and one output pin. The selection of the input is done using three selection pins, S0, S1, and S2. The selection pins of the multiplexer can be used to select any one of the eight input pins. Based on the logic levels of the selection pins, the corresponding input pin is connected to the output pin.

The multiplexer needs a control signal, VDD, to provide power to the circuit, and an output enable signal, OE, to control the output signal. When the output enable signal is set to High, no output is activated, and the output signal is switched off, thus bypassing the multiplexer. When the signal is set to Low, the output is enabled, and the signal coming from the chosen input is sent to the output.

The SN74ALS157AD is designed to provide quality performance owing to its low power consumption. Its power consumption is only 46.5 mW per MHz, which is significantly lower than other circuits, thus improving its power-switching efficiency.

Conclusion

The SN74ALS157AD multiplexer is a commonly used device employed to switch digital information from multiple sources to a single destination. It is specially designed to provide speeds up to 54MHz and also improve power-switching efficiency. It is employed for switching digital signals, for creating customised waveforms or amplifying signals, for radio modulation, audio multiplexing and audio amplifiers, as well as lighting and display control applications. Through its selection pins S0, S1, S2, and two control signals, VDD and OE, the SN74ALS157AD is able to quickly choose from a number of inputs and switch the output signal to the chosen input.

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