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Logic - Multivibrators

Multivibrators are electronic circuits used in many applications. These circuits consist of two or more semiconductor components connected together to achieve different output states. The most common and simplest type of multivibrator, known as a two-state monostable multivibrator, often utilizes two logic gates, and is commonly referred to as a flip-flop or a toggle switch. The basic operation of a two-state monostable multivibrator is to remain in a single output state until an input trigger is applied, after which it changes to its other state and then will remain in that state until another input is received. In this way, these multivibrators are used in applications where digital switching is needed, such as in digital circuit logic design and digital signal processing.

The 74HCT123D-Q100,115 is a type of logic circuit multivibrator from NXP Corporation. This particular multivibrator integrates four independently adjustable, dual, monostable multivibrator devices in a single 16-pin DIP package. This device is designed for use in various electronic applications, such as semiconductor memory, ICs and integrated systems.

Application Field

The 74HCT123D-Q100,115 can be used in a variety of applications that require rapid switching between two output states such as automotive electronic applications, switching between audio outputs, pulse-width modulation, coding, and analog/digital converters. The dual independent monostable multivibrators can also be used as two independent single-shot multivibrators. Each of these multivibrators also includes an off-set adjustment input, which is used to vary the output time from the trigger.

Working Principle

The 74HCT123D-Q100,115 features four independently adjustable dual monostable multivibrator devices. Each of the multivibrators consists of two flip-flops, which are connected together in order to obtain the output desired. The flip-flops are configured so that when an initiating pulse is received by the multivibrator, the output automatically switches from one state to the other, and then remains in that output state until the next initiating pulse is received. This change in the output state can be adjusted by changing the timing of the trigger pulse with the offset adjustment voltage.

This particular multivibrator is suitable for use in a wide range of applications, allowing for precise timing and switching. The device is easy to use, since all that is needed is to set the offset adjustment to the desired value and supply a triggering current to the device. The device also features a wide range of input and output voltage, making it effective for use in a range of different applications.

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