Series:	74HC
Packaging:	Tube
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:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SSOP (0.209", 5.30mm Width)
Supplier Device Package:	16-SSOP
Base Part Number:	74HC4538

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74HC4538DB,112 Application Field and Working Principle

Introduction

Multivibrators, comprising astable and monostable driven circuits, are amongst the most versatile and frequently used components in the electronics discipline. 74HC4538DB,112 is a monostable/ astable multivibrator integrated circuit, comprising an oscillator and six logic stages. It is capable of producing a pulse delay up to 1.25 seconds from an input of approximately 50mV. This integrated circuit can be found in many areas, ranging from controlling actuators to switching applications in industrial and automotive products. In this article, we will discuss the application field of the 74HC4538DB,112 and its working principle.

Application

The 74HC4538DB,112 is a practical and versatile integrated circuit that is used in many different application fields. They can be found in both analog and digital applications including:

• Timing and Pulse Generating
• Power Supplies
• Computer Keyboards and Peripherals
• Automotive Electronics
• Robotics
• Industrial Control Circuitry
• 3D-Printing Systems

Due to their versatility and accuracy, these integrated circuits are perfect for creating delayed, on/off or slow pulse sequences controlling a variety of mechanical, electrical and digital devices. Furthermore, since they consume very little power and allow for a wide range of timing intervals, they are a popular choice for applications such as power switching and economizing, as well as in car alarms and remote control systems.

Working Principle

The 74HC4538DB,112 operates as a free-running, monostable/astable multivibrator; it uses a pair of capacitors (C1 and C2) and resistors (R1 and R2), as well as two logic switching stages. When operated in monostable mode, a relatively short duration high-level pulse is generated through a voltage input that is previously stored in an internal capacitor. When operated in astable mode, the 74HC4538DB,112 produces a signal of constant frequency during a period of time, the period being determined by the values of capacitors C1 and C2 and resistors R1 and R2. The basic circuit for this integrated device is as follows: it consists of two logic switching steps, a logic gate and an oscillator. The logic gate includes six logic inputs, which produce an output either high or low; the oscillator circuit includes oscillator capacitor C1, a diode, oscillator resistor R1, resistor R2 and capacitor C2. The logic switching stages and the oscillator circuit interact in order to achieve a free-running, monostable/astable multivibrator; when a logic input is used to trigger the circuit (such as a manual pushbutton), the logic switches will send a signal to the oscillator circuit and the oscillator capacitor C1 will charge at a current proportional to the voltage gain between its voltage output and the voltage at logical input A. When the voltage input reaches the certain potential at logical output B, the oscillator circuit will discharge the capacitor C1, sending a signal to the logic stage, which will then activate the logic switch; the logic switch then sends a signal to the logic input A, causing the capacitor C1 to be recharged and the process repeats.

Conclusion

74HC4538DB,112 is a versatile integrated device used in many application fields. As a monostable/astable multivibrator, the device can produce a pulse delay up to 1.25 seconds from an input of approximately 50mV. Its working principle relies on two logic switching stages, a logic gate and an oscillator circuit, which interact to achieve the desired effect. Thanks to its low power consumption and the ability to allow for a wide range of timing intervals, this integrated circuit is capable of controlling a variety of mechanical, electrical and digital devices found in many application fields.

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