74HC221N,652

Overview

The 74HC221N,652 is a dual non-retriggerable monostable multivibrator manufactured by NXP Semiconductors. It operates within the HC logic family and is housed in a 16-pin DIP package. The device accepts active LOW-going edge input (nA) and active HIGH-going edge input (nB), either of which can function as an enable input. It features an overriding reset to terminate output pulses and includes hysteresis on nB inputs for improved noise immunity. The component is specified for operation from -40 °C to +125 °C.

Feature Summary

• Dual non-retriggerable monostable multivibrator configuration
• Active LOW-going edge input (nA) and active HIGH-going edge input (nB)
• Overriding reset capability to terminate output pulse
• Hysteresis on nB inputs for improved noise immunity

Applications

• Pulse generation circuits
• Timing delay applications
• Debouncing switches

Procurement Notes

Verify the specific suffix '652' against official Nexperia or NXP documentation to confirm tube packaging and lead-free status. Confirm current production status as end-of-life products may require alternative sourcing strategies. Ensure compatibility with existing PCB footprints and thermal management requirements before finalizing procurement plans.

Selection Notes

Select this component when a dual monostable multivibrator with independent triggering edges is required. The HC series offers high-speed CMOS performance compatible with standard TTL logic levels. Consider the wide operating temperature range and robust noise immunity provided by input hysteresis for demanding industrial environments.

Part Context

This part belongs to the 74HC/HCT221 series of dual non-retriggerable monostable multivibrators. It is pin-compatible with low power Schottky TTL (LSTTL) devices. The component is designed for general-purpose timing applications where precise pulse width generation and reliable triggering are necessary.

Replacement Considerations

Check for direct equivalents such as the 74HCT221N,652 for HCT logic level compatibility. Verify pinout and electrical characteristics against other monostable multivibrators like the 74HC123 if retriggerable functionality is needed.