CD74HC123M

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Logic - Multivibrators are electronic circuits which are used to create the two stable states with two outputs that could exist in two conditions. The CD74HC123M is one of these multivibrator circuits, with the main purpose of generating pulsed delay or pulse-width modulation signals. It is a popular integrated circuit (IC) due to its versatility, low power consumption and wide range of application fields.

It is used in several systems of digital devices and is implemented in both static and dynamic applications. One of the most popular static applications of this circuit is in digital clocks, counters and frequency dividers. On the other hand, dynamic applications include producing outputs for logic devices, creating a time delay for the control of signals, providing a separator for the control of signals and serving as a timer in pulse-width modulation applications.

The CD74HC123M contains a pair of NAND or Schmitt inverters and two main power supplies. It has an output stage composed of two Schmitt inverters connected cross-coupled to form an oscillator. The output states of the two Schmitts are called “positive” and “negative” conditions, which are referred to as “high” and “low” in electronics nomenclature.

It also has a power supply terminal, called ENBL, which allows the user to control the operating voltage from the outside. This terminal is also commonly referred to as the threshold voltage. The input voltages of the NAND gates of the CD74HC123M should be supplied only between the range of 0.8 and 5 volts.

When the CD74HC123M is powered up, both output stages of the two Schmitts will be in the low (negative) state. When the ENBL voltage is applied, the two Schmitts will be connected to its power supply, and their outputs will change accordingly. The timing of the changes in the outputs of the CD74HC123M depends on the value of the ENBL voltage applied.

The common output of the two Schmitts is connected to a resistor and capacitor. The RC circuit acts as a low-pass filter, allowing the rate of change of the common output voltage to be regulated. This helps in controlling the speed of the oscillator. In addition, the CD74HC123M also has an open-drain output which allows current to pass from the output of the Schmitts to ground.

In general, the CD74HC123M is designed to provide an accurate time delay for logic systems. It can also be used as a timer for pulse-width modulation (PWM) applications. Its high accuracy and low power consumption makes it suitable for both static and dynamic applications in digital devices.

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