Texas Instruments

CD74HCT221E  

Multivibrators

CD74HCT221E Description

The CD74HCT221E is a high-performance monostable multivibrator IC designed by Texas Instruments, belonging to the 74HCT series. This through-hole mounted IC features two independent monostable circuits, making it highly versatile for various timing applications. The device operates within a supply voltage range of 4.5 V to 5.5 V and offers a propagation delay of 18 ns, ensuring rapid and reliable signal processing. The CD74HCT221E is packaged in a tube format, making it suitable for industrial and commercial applications where robustness and ease of installation are crucial.

CD74HCT221E Features

• Monostable Logic Type: The CD74HCT221E is designed as a monostable multivibrator, which means it can generate a single pulse of a fixed duration in response to a triggering event. This feature is particularly useful in applications requiring precise timing control.
• Schmitt Trigger Input: Equipped with Schmitt trigger inputs, the CD74HCT221E can effectively handle noisy input signals, providing clean and stable output pulses. This is a significant advantage over similar models without Schmitt trigger inputs, as it enhances the reliability and accuracy of the device in noisy environments.
• Propagation Delay: With a propagation delay of 18 ns, the CD74HCT221E ensures fast and efficient signal processing, making it suitable for high-speed applications.
• Independent Circuits: The device features two independent monostable circuits, allowing for simultaneous operation of two different timing functions within a single package. This dual functionality reduces the need for additional components and simplifies circuit design.
• Current Handling: The CD74HCT221E can handle an output current of 4 mA for both high and low states, providing sufficient drive capability for various load conditions.
• Compliance and Safety: The IC is REACH unaffected and RoHS3 compliant, ensuring it meets stringent environmental and safety standards. This makes it suitable for use in a wide range of applications without regulatory concerns.

CD74HCT221E Applications

The CD74HCT221E is ideal for a variety of applications that require precise timing control and reliable signal processing. Some specific use cases include:

• Pulse Generation: The monostable nature of the CD74HCT221E makes it perfect for generating precise pulses in digital circuits, such as in clock generation or timing circuits.
• Noise Filtering: The Schmitt trigger inputs help in filtering out noise from input signals, making it suitable for applications where signal integrity is critical.
• Debouncing: The device can be used to debounce mechanical switches in digital systems, ensuring clean and stable signals are sent to subsequent digital circuits.
• Timing Circuits: The CD74HCT221E can be employed in various timing circuits, such as delay generators or one-shot timers, where a single pulse of a fixed duration is required.
• Industrial Control Systems: The robust through-hole mounting and compliance with environmental standards make it suitable for use in industrial control systems where reliability and durability are paramount.

Conclusion of CD74HCT221E

The CD74HCT221E from Texas Instruments is a versatile and reliable monostable multivibrator IC, offering a range of features that make it suitable for a variety of applications. With its fast propagation delay, Schmitt trigger inputs, and dual independent circuits, the CD74HCT221E provides precise timing control and enhanced signal processing capabilities. Its compliance with environmental and safety standards ensures it meets the requirements of modern electronics applications. Whether used in pulse generation, noise filtering, or timing circuits, the CD74HCT221E stands out as a high-performance solution in the electronics industry.

CD74HCT221E Documents

Download datasheets and manufacturer documentation for CD74HCT221E

Datasheets :

CD(54,74)HC(T)221 Datasheet      

HTML Datasheet :

CD(54,74)HC(T)221 Datasheet      

PCN Design/Specification :

Copper Bond Wire Revision A 04/Dec/2013       Material Set 30/Mar/2017