CD4047BCMX

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The CD4047BCMX is a CMOS timer IC from TI used to build multivibrators, timers, and frequency dividers. The CD4047BCMX is a highly versatile IC, useful for a wide range of logic-, timing-, and frequency-related applications. This article will discuss the CD4047BCMX application field and working principle.

Application Fields

The CD4047BCMX is used in an overall positive feedback system configuration. It is used to create a multivibrator circuit, which includes three inverting stages in the form of three logic gates connected in tandem. The output of the first inverting stage is connected to the input of the second inverting stage and out to the third, feedback path. These feedback paths are responsible for creating negative feedback from the output of the final inverter, which as a result controls the operation of the multivibrator.

In addition to its use in multivibrator circuits, the CD4047BCMX can also be used to create various types of timers, such as pulse-width modulation, astable multivibrators, and gated monostable multivibrators. These are commonly used for indication, a key feature of the CD4047BCMX. Applications can vary, but timers created with the CD4047BCMX have been used most commonly in airport systems, industrial clock control systems, and LED signage.

The CD4047BCMX can also be used to create frequency dividers, which are logic circuits specifically designed to output consistently the same frequency regardless of the frequency of the input signal. This is a useful feature of the CD4047BCMX, since it can be used to keep a variable clock rate consistent, allowing for a much more accurate timing mechanism and greater control of the timing system.

Working Principle

The CD4047BCMX’s working principle is to trigger two flip-flops which act as a pair of multivibrators. When power is applied, the circuit’s input will be switched from OFF to ON, causing the first flip-flop’s output to change from a HIGH logic level to a LOW logic level. The second flip-flop, in turn, will switch from a LOW logic level to a HIGH logic level.

The output of the two multivibrators (or flip-flops) is then fed-back to either enforce the state of the flip-flops (low or high) or to trigger a change in their state. As the voltage across the circuit changes, the multivibrator will switch between states, thus creating a square wave at the output of the multivibrator.

The internal logic of the multivibrator is provided by several gates, such as inverters, NOR gates, NAND gates, bistables, and Schmitt triggers. These gates are all used to create the multivibrator function, with their outputs connected together to control the flip-flop states.

The CD4047BCMX also has two built-in stabilizing features which ensure the operation of the multivibrator operates correctly. The first one is called hysteresis, which is a simple “looping” feedback technique which ensures the circuit remains stable. The second one is an internal Schmitt trigger, which is responsible for the proper working of the circuit when the input signal amplitude is high.

The CD4047BCMX is a reliable and versatile IC, capable of providing an array of logic-, timing-, and frequency-related applications. Its design includes a feedback system, several logic gates, and built-in stabilizing features which guarantee reliable operation. Although most used for multivibrators, timers, and frequency dividers, the CD4047BCMX offers a degree of flexibility as to where and how it can be used. This makes it an ideal choice for a variety of applications.

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