MM74HC221ASJ

Overview

The MM74HC221ASJ is a dual non-retriggerable monostable multivibrator manufactured by Fairchild Semiconductor. It utilizes advanced silicon-gate CMOS technology to provide speeds comparable to low power Schottky TTL while maintaining CMOS low power consumption and high noise immunity. The device features two independent circuits in a 16-SOP package, designed for generating precise timing pulses or delaying signals in digital logic applications.

Feature Summary

• Dual non-retriggerable monostable multivibrator configuration
• Advanced silicon-gate CMOS technology implementation
• High noise immunity characteristics inherent to CMOS design
• Performance levels comparable to low power Schottky TTL

Applications

• Timing pulse generation
• Signal delay circuits
• Digital logic timing control

Procurement Notes

Verify the specific suffix ASJ against current manufacturer documentation to confirm pinout and electrical specifications. Confirm availability status as this component may be discontinued or superseded by newer revisions. Ensure compatibility with existing PCB footprints and voltage requirements before procurement.

Selection Notes

Select this component when dual non-retriggerable monostable functionality is required with CMOS noise immunity. Compare propagation delays and supply voltage ranges against system requirements. Consider alternative packages if SOP form factor is unsuitable for the target assembly process.

Part Context

This part belongs to the MM74HC221 family of monostable multivibrators. It shares functional similarities with other HC series timers but offers specific packaging and performance traits defined by the ASJ suffix. It serves as a timing element within larger digital systems requiring reliable pulse generation.

Replacement Considerations

Direct substitutes include MM74HC221AM and MM74HC221AN from Fairchild Semiconductor. Cross-manufacturer alternatives should be evaluated for pin compatibility and electrical parameter alignment.