SN74AHC123ADRG4

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Multivibrators are electronic circuits used for generating rectangular waveforms or pulses. There are different type of multivibrators including Astable, Monostable, Bistable and Schmitt Trigger. Though various type exists, the basic function of all of them are to generate Square waveforms. SN74AHC123ADRG4 belongs to the family of dual one-shots with active-low outputs. ICs of this family are very versatile and can be used in a variety of applications.

The SN74AHC123ADRG4 is a dual one-shot device which means it has two mono-stable circuits which share a common negative (or active-low) reset and clock pins. The two circuits are independently triggered by their own clock level. Both the outputs are static (active-low outputs) and can be routed to any logic family without any modification. This is one of the main advantages of this IC.

The major application fields of SN74AHC123ADRG4 includes automotive, consumer and industrial applications. It is widely used for time delay applications where precise and accurate pulse widths can be obtained. It is also used for frequency division, accurate counting, pulse-width modulation and for motor control applications. SN74AHC123ADRG4 has one of the fastest response times due to its active-low outputs.

The working principle of this IC is fairly simple. This IC includes two independent monostable multivibrators with active-low outputs. Each one-shot multivibrator has reset and clock pin in common. The reset pin is used to reset both the one-shots and clock pin is used to trigger the one-shots. The two circuits are triggered by their own clock level. When the clock level transitions to high, the circuit changes its state and the output goes low. When the clock level transitions to low the circuit resets and the output goes high again.

The output pulse width can be controlled by two external resistors and capacitors (R1 and C1). The pulse width is determined by the formula, PW=1.1RC. The resistance and capacitance values can be selected to obtain any desired pulse width. The IC also provides a Schmitt Trigger on the Clock input. This Schmitt Trigger allows waveforms that are noisy or slow changing to be used as a clock input.

In conclusion, SN74AHC123ADRG4 is a widely used IC for generating precise and accurate pulse widths. This dual one-shot IC has active-low outputs which are static and can be routed to any logic family. It is used for time delay applications and for motor control. The pulse widths can be controlled by two external resistors and capacitors. A Schmitt Trigger is also provided on the clock input.

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