SN74LVC138ADT

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The SN74LVC138ADT logic chip is a high-performance 8-bit multiplexer with three-state output control. It offers three-state enable and select control at five logic inputs along with true/complement outputs. The device also features latchup-proof protection and packaging that can be either surface mountable or through hole.

The SN74LVC138ADT device was designed specifically for use in applications that require the selection and handling of multiple signals. It has been created to be both powerful and flexible, allowing it to operate in multiplexing scenarios or as a switch or demultiplexer, depending on the needs of the given application.

Application Field

The SN74LVC138ADT performs well in multiplexing applications such as signal routing, signal distribution, bus addressing, data acquisition systems, and communication networks. Additionally, it is often used as a true/complement output selector in various data multiplexing scenarios that require precise timing information.

The SN74LVC138ADT also has many industrial uses. It can be used in industrial control systems to manage multiple signals related to process control, instrumentation, and motor control devices. Automated systems such as robotics, conveyors, and other motion control systems can also benefit from the precise signal routing capabilities of this device.

Principle of Work

The SN74LVC138ADT operates using an advanced multiplexer control system. Incoming signals are routed using five direct-drive control data inputs (O-O-E-E-A) and two multiplex enable inputs. When the enable input is active (high logic level), input signals are distributed to either the true or complement outputs, also known as the “latched” outputs. The enable input also controls the internal logic gate that is responsible for distributing multiplexed signals.

The inputs follow a strict logical hierarchy. When the enable input is inactive, the multiplexer’s five data channels will be disconnected and the previously selected output will remain selected until the enable input is reactivated. This ensures that the last-selected output will remain selected until a new selection is made.

When the enable input is active, the device can be used in multiplexer scenarios. The five data inputs are used to select the desired true or complement output. The combination of data inputs then determines which output will be “latched” into the output. The outputs of the SN74LVC138ADT can be programmed to be either true or complement, allowing for multiplexing of either type of signal.

Conclusion

The SN74LVC138ADT is a powerful logic chip for multiplexing applications. Its ability to programmably select true/complement outputs from a set of five control data inputs make it ideal for a variety of industrial and communication applications. Its latchup-proof protection and multiple packaging options make it one of the most versatile and reliable multiplexers available. The SN74LVC138ADT is a practical and highly efficient choice for switching and demultiplexing needs.

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