MM74C221N

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• Introduction

  The MM74C221N is an monostable multivibrator belonging to the family of digital integrated circuits. This multivibrator is an digital circuit with two states: quiescent and triggered. A monostable (single-shot) multivibrator is "triggered" and then returns to a quiescent state, whereas an astable multiviberator is continuously "triggered" and therefore oscillates between quiescent and triggered states.

• Application Field

  The MM74C221N Multivibrator integrated circuit with delay-on-make/delay-on-break outputs and variable duty cycle is commonly used for pulse generation, pulse-width modulation, signal conditioning and data coding applications. The MM74C221N is a versatile multivibrator having symmetrical output circuits for producing timing functions of equal: (1) delay-on-make and delay-on-break or (2) delay-on-make and equal in duration to the delay-on-break. The MM74C221N has several features including a variable duty cycle and adjustable delay timing.

• Working Principle

  The MM74C221N Monostable Multivibrator works by taking an input pulse and generating a pulse output of specified width (determined by an onboard resistor-capacitor timing circuit). This output pulse is triggered by the leading edge of the input pulse, and is then reset by the trailing edge. The time between these process is known as the time delay. This time delay is usually adjustable, by varying the RC network on-chip.

  The major operation of the MM74C221N Monostable Multivibrator is same to that of Astable Multivibrator. Astable multivibrator will continually remain in triggered state, while Monostable multivibrator will remain in triggered state only for fixed duration of time before automatically returning to quiescent state. This duration of time is usually dependent on the values of the external resistor and capacitor correspondingly connected to it. Thus, this MM74C221N Monostable Multivibrator is definitely a very useful timing device.

• Conclusion

  The MM74C221N Monostable Multivibrator is a digital circuit with two operating states, quiescent and triggered, used for pulse generation, pulse-width modulation, signal conditioning and data coding. It works by taking an input pulse, triggering a pulse output of specified width, controlled by an onboard RC timing circuit, and then resetting the output back to quiescent state. It is a very versatile device with its adjustable time delay feature making it perfect for many types of applications.

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