74F257ASC

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74F257ASC is a high performance device of logic and signal switches, multiplexers and decoders, manufactured by Fairchild Semiconductor. It is a SelectOR Gate, featuring 2- Input Multiplexers with two 2-Input Multiplexers and four 1-Input Multiplexers. With both the 2-Input Multiplexers and 1-Input Multiplexers, the user has the choice to select two binary signals, simultaneously.

The output of the 74F257ASC is a logic-compatible signal based on what is inputted. As the name suggests, it is dual 2-Input Multiplexer, multiplexing up to four different input binary signals. This means that the device is capable of switching between one binary signal and another, and the output is a product of the binary signals selected.

Application Fields

The 74F257ASC is ideal for applications where multiple binary signals need to be switched between, quickly and reliably. Examples include robotics, networking, telecommunications, and general logic/signal switching.

Depending on the specific application, the 74F257ASC can be used in applications ranging from data bus management, to wireless sensor networks, to controlling home appliances remotely. The device offers superior performance compared to traditional devices, due to its ability to multiplex up to four binary signals, simultaneously.

Working Principle

The 74F257ASC utilizes two switching elements to ensures that the output is compatible with logic level 4 (VOH). These two switching elements are comprised of a low-level field motor and a high-level field motor. The low-level field motor is activated when the output voltage is greater than or equal to VOH (logic 1), while the high-level field motor is activated when the output voltage is less than or equal to VIL (logic 0).

The low-level field motor will then place a logic 1 on the output by allowing a current to flow, which will override any current flowing from the high-level field motor. Conversely, the high-level field motor will place a logic 0 on the output by blocking any current from flowing from the low-level field motor.

The 74F257ASC multiplexers are also considered more reliable than traditional multiplexers as they are built with Fairchild’s advanced Tri-State logic structure. This includes an improved logic circuit arrangement, as well as improved performance in signal distortion and signal propagation delays.

The 74F257ASC solution is also cost effective, offering improved functionality and performance, while saving end customers on costs associated with multiplexers. The device supports asynchronous signal control, and is highly flexible and adaptable for various application usage models.

Conclusion

The 74F257ASC is a versatile device that has a wide range of applications in fields such as robotics, computer networking, telecommunications, and general logic/signal switching. The device is built upon advanced Tri-State logic structure and is considered more reliable than traditional multiplexers, while also being low-cost, high performance and with asynchronous signal control.

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