CD74HC221M

Multivibrators Overview

The CD74HC221M is a dual monostable multivibrator from the Texas Instruments HC logic family, housed in a 16-pin SOIC surface-mount package. It operates within a supply voltage range of 2 V to 6 V and supports a maximum static current of 0.008 mA. The device features a minimum pulse width of 12 ns and a maximum propagation delay of 210 ns at 2 V with maximum load capacitance. Output drive capabilities include a maximum high-level output current of -5.2 mA and a low-level output current of 5.2 mA. It functions reliably across an extended temperature range from -55 °C to +125 °C.

Multivibrators Feature Summary

• Contains two independent monostable multivibrator circuits within a single package.
• Compatible with standard CMOS logic families for broad system integration.
• Supports operation over an extended industrial temperature range.

Multivibrators Applications

• Timing generation and pulse stretching
• Debouncing switches or contacts
• Frequency division

Multivibrators Procurement Notes

Verify the specific manufacturer part number against official datasheets to ensure compatibility with design requirements. Confirm that the ordering suffix matches the desired packaging format, such as tape and reel or cut tape, as these affect handling procedures. Check for any recent product change notices regarding pinout or electrical characteristics before finalizing procurement decisions.

Multivibrators Selection Notes

Select this component when dual monostable functionality is required in a compact surface-mount form factor. Ensure the operating voltage aligns with the 2 V to 6 V specification. Consider the propagation delay and pulse width constraints relative to the system timing requirements. Verify thermal performance within the specified -55 °C to +125 °C range for the intended application environment.

Multivibrators Part Context

This device belongs to the Texas Instruments 74HC series of high-speed CMOS logic devices. The 74HC221 specifically provides dual monostable multivibrator functionality. It is designed for applications requiring precise timing control using external resistors and capacitors. The SOIC-16 package allows for efficient PCB layout in space-constrained designs.

Multivibrators FAQ

Is the CD74HC221M retriggerable?

Yes, the internal circuitry of the CD74HC221M supports retriggerable operation, allowing the output pulse width to be extended by subsequent trigger pulses during the timing interval.

What determines the output pulse width?

The output pulse width is determined by the values of the external resistor and capacitor connected to the device, as specified in the official datasheet equations.