DM74LS221N

Multivibrators Overview

The DM74LS221N is a dual non-retriggerable monostable multivibrator in a 16-PDIP package. It features Schmitt-trigger inputs for noise immunity and complementary outputs. The device operates on a 4.75 V to 5.25 V supply with an operating temperature range of 0°C to 70°C. Propagation delays are typically 55 ns to 80 ns, and output pulse widths range from 30 ns to 70 seconds.

Multivibrators Feature Summary

• Dual non-retriggerable one-shot configuration
• Schmitt-trigger input for jitter-free operation
• Complementary outputs available
• Direct reset capability via active-low clear input

Multivibrators Applications

• Timing circuits requiring stable pulse generation
• Debouncing switches or contacts
• Pulse width modulation systems
• Frequency division applications

Multivibrators Procurement Notes

Verify the component status as discontinued by the original manufacturer. Confirm availability through authorized distributors or secondary market suppliers. Ensure replacement components match the required pinout and electrical specifications for direct integration into existing designs.

Multivibrators Selection Notes

Select this component for applications requiring dual independent timing channels with high noise immunity. Verify that the external timing resistor and capacitor values align with the desired pulse width. Consider the PDIP package constraints for PCB layout and thermal management during selection.

Multivibrators Part Context

This part belongs to the 74LS logic family, known for low-power Schottky TTL compatibility. It serves as a dual monostable multivibrator alternative to retriggerable variants like the 74LS123, despite sharing identical pinouts. The device provides reliable pulse generation for digital timing applications.

Multivibrators Replacement Considerations

SN74LS221N (Texas Instruments) is a direct functional substitute. CD74HCT123E (Texas Instruments) is listed as a similar alternative but requires verification of functional differences due to retriggerable nature.