74HCT123D/AUJ

Series:	74HCT
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	Monostable
Independent Circuits:	2
Schmitt Trigger Input:	Yes
Propagation Delay:	26ns
Current - Output High, Low:	4mA, 4mA
Voltage - Supply:	4.5V ~ 5.5V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SO
Base Part Number:	74HCT123

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Introduction
The 74HCT123D/AUJ is a type logic integrated circuit that is used in designs requiring variable delay or oscillation. It is a CMOS dual retriggerable monostable multivibrator offering two output widths, either specifiable independently or equal. Its ability to provide precise timing and Its wide ability to interface with other commonly used logic ICs makes It an ideal choice for a wide range of electronics applications in various industries.
Application Field
The 74HCT123D/AUJ can be used in a wide variety of electronic designs. It is useful in designing circuits that require precise timing, as well as in applications where two different output widths are needed, such as pulse-width modulation, pulse-position modulation, and frequency division. It is used in combination with other logic circuits to create systems with a wide range of functions, from simple notification or resetting of industrial-level systems, to more complex functions, such as controlling servos in robotics. This device is often used in small brushed DC motor control circuits and robotic applications, due to its wide range of input and output compatibility. The 74HCT123D/AUJ is also used in medical equipment, automotive applications, military equipment, telecommunications systems, etc.
Working Principle
The 74HCT123D/AUJ is an edge-triggered retriggerable monostable multivibrator, where each input has two “trigger” edges, a positive-going (trigger 0) and a negative-going (trigger 1). The device is triggered when the Input signal rises and produces an output pulse of a specified width when the input drops below a certain voltage level. The two output pulses can be of equal width or individually specified on two separate pins. The device is retriggerable, meaning that it will start the output pulse over again each time the input is triggered. The output will remain in the active (low) state for the entire duration of the trigger signal, and during the “off” period, the output remains in a high-impedance state and does not draw any current. This allows the multivibrator to produce output pulses of different widths depending on the input signal.
Conclusion
The 74HCT123D/AUJ is a dual retriggerable monostable multivibrator, which is used in a wide variety of applications. It is an ideal choice for designers needing an IC that will produce two output pulses of different widths, and offer precise timing, as well as wide compatibility with other ICs. This IC is used in a multitude of electronic designs all across the world, from telecommunications systems to medical equipment, robotic applications, military equipment, motor control and so much more.

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