Texas Instruments

SN74121DR  

Multivibrators

SN74121DR Description

The SN74121DR is a monostable multivibrator logic IC chip, part of the renowned 7400 series, manufactured by Texas Instruments. This IC is designed to provide reliable and precise timing functions in various electronic circuits. It features two independent monostable circuits, making it highly versatile for applications requiring multiple timing functions. The SN74121DR operates within a supply voltage range of 4.75 V to 5.25 V and can function effectively within an operating temperature range of 0°C to 70°C. The propagation delay of 45 ns ensures rapid signal processing, making it suitable for high-speed applications. The IC is packaged in a surface-mount 14SOIC format, which is ideal for compact and space-efficient designs. Despite its obsolescence, the SN74121DR remains a valuable component due to its robust performance and compatibility with existing systems.

SN74121DR Features

• Monostable Logic Type: The SN74121DR features a monostable multivibrator, which provides a single output pulse of a specific duration in response to a trigger input. This is ideal for applications requiring precise timing control.
• Independent Circuits: With two independent monostable circuits, the SN74121DR can handle multiple timing functions simultaneously, enhancing its versatility.
• Propagation Delay: A propagation delay of 45 ns ensures rapid signal processing, making it suitable for high-speed applications.
• Surface Mount Packaging: The 14SOIC package is designed for surface-mount technology, allowing for compact and space-efficient PCB designs.
• Supply Voltage Range: The IC operates within a supply voltage range of 4.75 V to 5.25 V, ensuring compatibility with standard 5V systems.
• Operating Temperature Range: The SN74121DR can function reliably within an operating temperature range of 0°C to 70°C, making it suitable for a wide range of environmental conditions.
• Output Current Capability: The IC can provide an output current of 400µA high and 16mA low, ensuring robust performance in various load conditions.
• Compliance and Safety: The SN74121DR is REACH unaffected and RoHS3 compliant, ensuring it meets environmental and safety standards.
• Moisture Sensitivity Level: With an MSL rating of 1 (Unlimited), the IC is highly resistant to moisture, ensuring long-term reliability in storage and operation.

SN74121DR Applications

The SN74121DR is ideal for applications requiring precise timing control and multiple timing functions. Some specific use cases include:

• Pulse Generation: Ideal for generating precise timing pulses in digital circuits, such as clock signals or timing intervals.
• Debouncing: Effective in debouncing mechanical switches, ensuring clean and reliable digital input signals.
• Delay Circuits: Useful in creating delay circuits for sequential operations, such as in microcontroller peripherals or communication interfaces.
• Signal Processing: Can be employed in signal processing applications where precise timing intervals are required, such as in data acquisition systems.
• Industrial Control Systems: Suitable for industrial applications where reliable and precise timing is crucial for process control and automation.

Conclusion of SN74121DR

The SN74121DR, despite being an obsolete model, remains a valuable component due to its robust performance and compatibility with existing systems. Its monostable multivibrator design, combined with two independent circuits, makes it highly versatile for a wide range of applications. The rapid propagation delay of 45 ns ensures it can handle high-speed operations, while its surface-mount packaging allows for compact and efficient PCB designs. The SN74121DR is ideal for applications requiring precise timing control, such as pulse generation, debouncing, delay circuits, and signal processing. Its compliance with environmental and safety standards, along with its resistance to moisture, ensures long-term reliability and performance. For engineers and designers looking for a reliable and versatile timing solution, the SN74121DR is a worthy consideration.

SN74121DR Documents

Download datasheets and manufacturer documentation for SN74121DR

Datasheets :

SN54/74121      

HTML Datasheet :

SN54/74121