74ACT151PC

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74ACT151PC is an 8-channel multiplexer/demultiplexer, providing low power Schottky TTL (LSTTL), a counter phrase to enhanced TTL (ETT). It is used to combine/seperate signals in computer and communication systems. Here we are going to talk about its application field and working principle.

In general, the 74ACT151PC comes in 16-pin dual-in-line (DIP) package, allowing 16 discrete channels as input and output. It has an eight channel multiplexer and eight channel demultiplexer, each with its own Input A,B and C and Output Y0 to Y7. A select line (S1,S2), common active low enables for each multiplexer and demultiplexer and a common active high enable for both multiplexer and demultiplexer are used. Outputs are capable of sinking up-to 16mA of current.

Application Field

The 74ACT151PC are general purpose multiplexers and demultiplexers and as such, they find applications in a wide range of fields including computer and communication systems. Here are a few:

• Computer and Communication Systems: 74ACT151PC are frequently used in the bus controllers, multiplexers, computer address decoders and multiplexers inputs for digital to analog converters.
• Industrial automation: 74ACT151PC can be used to construct an addressable matrix encoder/decoder.
• Audio/video systems: They are usued for A/D and D/A converters, DAC/ADC selectors.
• Security systems: 74ACT151PC can be used in security systems to route/distribute information to/from sensors.

Working Principle

At the heart of the 74ACT151PC is an array of 8 (2-bit wide) data channels and a control circuit, which provides enable input and select control lines. It is composed of two major parts – multiplexer and demultiplexer. Each part has two select inputs, one enable input and eight output lines.

In a multiplexer part, the data channels are enabled when both select lines S1 and S2 and the enable line EN are active. With the enable line, S1 and S2 input, the data channel selected will be routed to the Y output. In a demultiplexer part, the data channels are enabled when both select lines S1 and S2 and the enable line EN are active. With the enable line, S1 and S2 input, the data input in the channel selected will be routed from the Y output.

Thus, the 74ACT151PC provides a simple, low cost way for routing or distributing signals to/from devices. Moreover, the availability of DIP packages allows very compact circuit design.

Conclusion

The 74ACT151PC is a versatile component that can find applications in a wide range of areas. Its low power Schottky TTL makes it suitable for low power applications, while its ability to provide 8 channel multiplexing/demultiplexing allows for a variety of routing/distributing options. With its simple working principles and low cost, the 74ACT151PC is sure to be a popular component used in a range of modern day applications.

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