CD74HC123NSR

Series:	74HC
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	Monostable
Independent Circuits:	2
Schmitt Trigger Input:	No
Propagation Delay:	25ns
Current - Output High, Low:	5.2mA, 5.2mA
Voltage - Supply:	2V ~ 6V
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Supplier Device Package:	16-SO
Base Part Number:	74HC123

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The CD74HC123NSR is a dual retriggerable monostable multivibrator integrated circuit. As such, they are commonly referred to as one-shots and form the core of a variety of both industrial and consumer electronics. They are used for a wide array of purposes, from robust state machine design to low power triggering and signal generation for analog circuits. This article will discuss the application field of the CD74HC123NSR and its working principle.
A monostable multivibrator consists of two cross-coupled transistors or CMOS gates. When first triggered, the output of the monostable multivibrator will switch from one state to another, usually low to high. The output then remains in this altered state until a second trigger signal is received. The period of time that the output remains high is referred to as the time delay, or period, of the monostable multivibrator.
The CD74HC123NSR monostable multivibrator is a dual device, meaning it features two separate monostable multivibrators in a single integrated circuit. This allows it to be triggered independently and with variable delays. The CD74HC123NSR has an operational maximum time delay of 1000µs. This allows it to be used in many Analog-to-Digital (A/D) conversion applications for converting analog signals into digital signals, including Video Conversion and Audio Sampling.
The CD74HC123NSR can also be used as a retriggerable one-shot. A retriggerable one-shot will reset the time delay to 0 upon receiving a second trigger signal without changing its output. This can be used in applications where it is desirable to ignore intermediate trigger signals, such as in PWM circuits, noise removal, and clock synchronization.
In addition to its use in analog-to-digital conversion, CD74HC123NSR can also be used in other applications, such as:

• Generating clocking signals in communications circuits.
• Generating precise timing signals in microcontroller systems.
• Designing high-frequency timers.
• Synchronizing digital logic signals.

The CD74HC123NSR monostable multivibrator also has power-saving advantages over other discrete components, such as Schmitt triggers, since it uses much less power when operated in its quiescent state. In addition, its low power consumption makes it a suitable choice for battery-powered systems.
The CD74HC123NSR works by changing its output at defined intervals, when triggered. This is accomplished by using two negative edge-triggered flip-flops, one for each monostable multivibrator, along with external resistors and capacitors. When triggered, the flip-flops are reset, allowing the pulse to begin. This results in the appropriate time delay, until the flip-flops are reset again by a second trigger.
In conclusion, the CD74HC123NSR is a dual retriggerable monostable multivibrator integrated circuit with a maximum operating time delay of 1000µs. This device has a variety of applications, from analog-to-digital conversion to generating clocking signals for microcontrollers. It also offers power saving benefits over discrete Schmitt triggers, making it a suitable choice for battery-powered systems.

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