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Logic - Signal Switches, Multiplexers, Decoders

QS3VH384PAG is a logic-signal switch, a digital circuit whose input and outputs are both logic-level signals. It is used in systems or projects where the interface between components needs to be navigated or changed. Such an application may require multiple inputs to be selected and switched to an output line.

QS3VH384PAG is a 4-channel multiplexer with 4 independent channels. It is owned by the famous FET logic switch provider Fairchild Semiconductor. Different from basic multiplexer, QS3VH384PAG has several optional features including low power, power saving and fast switching time. In addition, it contains a combination of four inverters and a high-speed CMOS multiplexer.

Application Field

QS3VH384PAG is not just an ordinary multiplexer; it has many application fields. It can be used to make logic switches, logic gates and even digital logic circuits. Moreover, its small size makes it easy to mount on printed circuit boards. It is often used in applications where the interface between components needs to be navigated. Furthermore, its high speed switching and power saving features are suitable for communications and telecommunications applications. In addition, its speed and availability for external control makes it suitable for industrial automation applications.

Working Principle

QS3VH384PAG is a four-channel multiplexer, with each channel containing a combination of four inverters and a high-speed CMOS multiplexer. The input and outputs are both logic level signals. The inverter provides an output state which is the inverse of the input state. The multiplexer turns on the corresponding output based on the selection signals Do, Di, and Rh. Do controls which channel is switched on and Di and Rh determine the output level of the selected channel.

When one of four channels is selected, the input is converted by the four inverters and then passed to the corresponding output. If no channel is selected, the output behaves as Hi-Z or float state, that means there is no current flowing. Therefore, either the input or the output of each channel can be connected to other circuits, depending on the logic level.

The most important part of QS3VH384PAG is its low power, power saving and fast switching time. In order to maintain the low power supply, QS3VH384PAG has a power-down command that puts the circuit into a "sleep" mode. While in this mode, the circuit consumes less power and its input resistance increases to infinity. This allows the power supply to be cut off while the circuit is not in use. In order to get the fast switching time, QS3VH384PAG also provides a control delay feature. This feature ensures that the output is activated as soon as the input is received.

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