How many data input terminals does an 8-to-1 data selector have?

An 8-to-1 data selector has 8 data input terminals; the data selector is a combinational logic that selects a specified one from a set of input signals and sends it to the output terminal based on a given input address code. Circuit, an 8-to-1 data selector has 3 address input terminals and 8 data input terminals.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

There are several data input terminals of an 8-to-1 data selector.

The data selector (data selector) selects the specified input signal from a set of input signals based on the given input address code. A combinational logic circuit that is sent to the output. It is sometimes called a multiplexer or multiplexer.

The data selector refers to transmitting the data of multiple channels to the only public data channel after selection. The logic circuit that implements the data selection function is called a data selector. In the process of multi-channel data transmission, a circuit that can select any one of them as needed is called a data selector, also called a multiplexer or multiplexer.

8-select-1 data selector, 3 address input terminals, 8 data input terminals.

The pin diagram of the 8-to-1 data selector 74LS151 is as follows:

The chip is a DIP16 chip, so its power supply is located at 16 pin, ground is located at pin 8. Its 7-pin S' is the enable terminal. When S' is low level, the chip works; when S' is high level, the chip is prohibited from working. This is the same function as S1', S2 and S3 of 74LS138.

The data input terminals D0~D7 of 74LS151 are pins 4, 3, 2, 1, and 15, 14, 13, and 12 in order. The corresponding three-digit address codes are A2:9, A1:10, and A0:11. Its output Q is pin 5, pin 6 is Q', and its value is opposite to Q.

Extended information

Take the 8-to-1 data selector 74LS151 as an example. If A2A1A0 and D0~7 are regarded as input at the same time, then the 8-to-1 data will be The selector becomes a 4-input combinational logic circuit.

Since the combinational logic circuits that need to be designed using 74LS151 are all 3-inputs, you only need to use A2A1A0 as input, and set D0~D7 corresponding to "1" to "1" and the corresponding "0" The minimum terms D0~D7 are set to "0", that is, an 8-to-1 data selector can be used to design a three-input combinational logic circuit.

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