74LV123DB,112

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Logic - Multivibrators

The 74LV123DB,112 is a dual one-shot, non-retriggerable, monostable multivibrator. It is commonly used as part of a circuit to create timing delays or oscillators. The multivibrator is entirely digital and can be triggered by external signals. The two multivibrator outputs can be used for two separate tasks, but are both synchronized and generated at the same time.

Applications

This multivibrator is well suited for applications that require a timing circuit. As such, it can be used in a variety of contexts. It has been used to create delay generators, tone generators, transducer activators, counters and other digital circuits. It has also been used to build computers and as part of industrial automation. That said, it is also quite popular in avionics, as it is used to help regulate the triggering of airborne lighting and targets.

Working Principle

The 74LV123DB,112 follows a typical four-state multivibrator configuration. It consists of two identical stages, with the triggering of one stage being triggered by the outputs from the other. This makes it monostable, meaning it can potentially output a single pulse. In its idle state, the multivibrator remains in a low output state. If a trigger is applied to the input, the output of one stage “switches off”, while the output of the other stage “switches on”. This changes the logic state.

The length of the output pulse depends on the duration of the trigger, as well as the two circuit components shown in the schematic. The trigger itself is determined by two components: a resistor and feedback capacitance. The capacitor\'s job is to “charge and discharge” in order to achieve a certain amount of time and the resistor decides the amount of time the capacitor takes to reach its full discharge.

The 74LV123DB,112 has a reset terminal which can be used to reset the device. This can be useful if the length of the output pulse needs to be changed, or the pulse needs to be started from the beginning, with no delays.

The multivibrator also features an asynchronous clear pin, which can be used to reset the output. This is especially useful when used with triggered clocks. This can be used to reset the output pulse to zero.

In a multivibrator, one of the outputs is always inverse of the other. Consequently, the 74LV123DB,112 can also be used to generate structured square waves or inverted inputs. This can be useful for certain types of scrambling algorithms, which depend on adding randomness to the communication signal.

Conclusion

The 74LV123DB,112 is a popular logic device, due to its versatility and wide range of applications. It is an ideal choice for applications that require a timing circuit, such as delay generators, tone generators, transducer activators and industrial automation. Its ability to reset its outputs is an essential feature and, since it is completely digital, it is extremely reliable and low maintenance.

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