SN74LS221NS

Overview

The SN74LS221NS is a dual non-retriggerable one-shot multivibrator manufactured by Texas Instruments in the 74LS logic series. It features two independent circuits housed in a 16-pin Small Outline package (SOIC). The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a propagation delay of 45 ns. It provides both true and complementary outputs for each circuit, with an output current capability of 8 mA at low levels and 400 µA at high levels.

Feature Summary

• Dual independent non-retriggerable monostable multivibrator circuits
• Provides both true and complementary output signals
• Includes internal clear function for resetting the timing cycle

Applications

• Pulse generation and shaping
• Timing delays
• Frequency division

Procurement Notes

Verify that the specific part number suffix matches the required package type. Confirm RoHS compliance status as it varies by manufacturing revision. Ensure the supplier source is authorized to guarantee component authenticity and traceability.

Selection Notes

Select this component when dual isolated pulse generation is required in a compact surface-mount form factor. Consider the 74LS series characteristics regarding power consumption and speed relative to other logic families available from the manufacturer.

Part Context

This component belongs to the standard 74LS TTL logic family, widely used for general-purpose digital logic applications. It serves as a surface-mount alternative to through-hole DIP variants like the SN74LS221N, maintaining functional compatibility while adapting to modern PCB assembly requirements.

Replacement Considerations

SN74LS221DR: Direct replacement offering identical functionality in a SOIC-16 package.