SN74LS221N

Overview

The SN74LS221N is a dual non-retriggerable monostable multivibrator manufactured by Texas Instruments. It operates within a supply voltage range of 4.75 V to 5.25 V and features a propagation delay of 65 ns. The device provides two independent circuits per package, with a maximum low-level output current of 8 mA and a high-level output current of -400 µA. Designed for through-hole mounting, it utilizes a 16-pin PDIP package and functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Dual non-retriggerable monostable multivibrator configuration
• Complementary outputs available for each circuit
• Integrated clear function for immediate reset

Applications

• Pulse generation and timing control
• Debouncing switches
• Frequency division

Procurement Notes

Verify the specific manufacturer part number against official Texas Instruments documentation to confirm compatibility. Ensure that the procurement channel provides valid traceability for the SN74LS221N component. Cross-reference the datasheet specifications regarding electrical characteristics and packaging requirements before finalizing acquisition.

Selection Notes

Select this component when a dual-channel monostable solution with complementary outputs is required. Consider the 65 ns propagation delay and standard TTL logic levels. Verify that the 16-pin PDIP package aligns with the target PCB layout constraints and thermal management requirements for the intended application environment.

Part Context

This component belongs to the SN74LS221 series of dual non-retriggerable one-shots. It serves as a fundamental building block in digital logic systems requiring precise pulse width modulation or timing delays. The LS variant offers standard speed performance suitable for general-purpose timing applications within the 7400 logic family ecosystem.

Replacement Considerations

SN74LS221NSR

FAQ

Does the SN74LS221N support retriggering?

No, the SN74LS221N is specifically designed as a non-retriggerable monostable multivibrator.

What type of outputs does this IC provide?

It provides both Q and Q-bar (complementary) outputs for each of its two internal circuits.