74VHC139CW

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Introduction

The 74VHC139CW is a 1-of-3 decoder logic device, enabling 3-bit binary input to be converted into one of three output signals. It is a member of the standard-logic VHC family, offering higher switching speeds and improved noise immunity between circuits, compared to standard TTL devices. This particular IC has a CMOS-level power-dissipation and inputs, enabling high-speed switching between active and stand-by mode, further reducing power consumption.

Application Field

The 74VHC139CW is suited for applications where high-speed output and low-power are essential. For example, it can be used in a variety of communication circuits, such as to control which of 3 signals is outputted to the user, or to select one of two signals for further processing. Additionally, the 74VHC139CW is commonly used in numerical and commercial equipment where voltage-level is of importance. It can also be used in logic-level conversion applications, or in audio/video switching circuits.

Working Principle

The 74VHC139CW consists of two independent 1-of-2 decoder circuits. Each decoder consists of two inputs (A and B) and two normally-open output pins (O1 and O2). When the A and B inputs are set to 0, then both O1 and O2 outputs will be 0. When A=0 and B=1, then O1 will be 0 while O2 will be 1. When A=1 and B=0, then O2 will be 0 while O1 will be 1. When both A and B are set to 1, both outputs will be 1.

The 74VHC139CW also includes a 3-bit binary input (pins A1 to A3) and three normally-open output (Output1 to Output3). The binary input is used to select one of the outputs, according to the following table:

The primary benefit of the 74VHC139CW is that it operates at very low voltage levels, while still providing reliable and accurate outputs. This is particularly important when dealing with sensitive signals, as the low voltage levels and improved noise immunity will ensure that the intended signals are being accurately received and decoded.

Conclusion

The 74VHC139CW is a high-speed, low-power and reliable 3-bit binary-input to 1-of-three output decoder, designed for applications where noise immunity, voltage-level reliability and high-speed are of utmost importance. This device is commonly used in communications, logic-level conversion, commercial and numerical equipment, audio/video switching and other applications where reliable outputs are essential.

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