CD74HC4538PWR

Series:	74HC
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	Monostable
Independent Circuits:	2
Schmitt Trigger Input:	Yes
Propagation Delay:	21ns
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-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	16-TSSOP
Base Part Number:	74HC4538

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Introduction

CD74HC4538PWR is a logic device from Texas Instruments, which is designed to be used in applications that require logic level conversion or frequency division. It is also a programmable multivibrator, which allow developers to set frequency of the output signal. This article aims to introduce the practical applications and operating principles of this device.

Application Field

The CD74HC4538PWR is often used in radio frequency applications such as receivers, transmitters and frequency synthesis since it can produce a frequency division of 4 to 65535 by successive divisions by two. This helps operation designers control their circuit design while reaching specified performance goals. Additionally, the device is often used in logic level conversion due to its wide supply range from 0.5 to 16V. This allows designers to use the device in both high and low voltage circuits.The device is also frequently found in home security systems, data acquisition systems and medical equipment where extremely reliable performance is required. Under certain conditions, the device can separate a digital clock signal into two square-wave signals that have a 90° out-of-phase relationship, conductible for a wide range of clock applications.It is important to note that using the device can help designers reduce their component count, as the user can design with one microcontroller or logic device instead of two, as it was previously done.

Working Principle

The CD74HC4538PWR is an integrated circuit (IC) used as a programmable multivibrator device. In essence, it is a single chip that allows designers to configure their own frequencies and give them a high accuracy.When the device is powered, both inputs of the chip are marked low, and each output is marked high. When CLK input of the device is marked high, the Q output will be marked low, while the Qn output will remain high. This is due to the fact that Q and Qn have a fundamental out-of-phase relationship.Moreover, when the device is connected to the supply voltage, a manual reset can be triggered. When triggered, the device will reset to a low state, and the Q and Qn outputs will return to their default states. The device has a high resistance to crosstalk interference.In addition, the device is capable of frequency division when the D-input is marked high. When this happens, the output frequency, that is the period of the output, will be reduced by a certain amount. The exact amount is dependent on the wide-range frequency division selection provided by the device itself.Finally, the device requires minimal energy to power. The low voltage and current requirements allow designers to incorporate the device with any kind of circuit design as they don’t have to worry about introducing instability or power drain issues.

Conclusion

In conclusion, the CD74HC4538PWR is a programmable multivibrator device that is commonly used in radio frequency applications such as receivers, transmitters and frequency synthesis. It can also be used in logic level conversion and home security systems, data acquisition systems and medical equipment. The device is capable of frequency division, and is known for its low voltage and current requirements.

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