SN74LS221NSR

Overview

The SN74LS221NSR is a dual non-retriggerable one-shot monostable multivibrator manufactured by Texas Instruments. It operates within the standard 74LS logic series and is housed in a 16-pin SOIC surface-mount package. The device functions with a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range from 0°C to +70°C. Key electrical characteristics include a propagation delay of 45 ns, a low-level output current of 8 mA, and a high-level output current of 400 µA.

Feature Summary

• Contains two independent non-retriggerable monostable circuits for pulse generation.
• Provides both true and complementary outputs for each channel.
• Includes an asynchronous clear input to reset the timing cycle immediately.

Applications

• Timing pulse generation
• Frequency division
• Pulse width modulation

Procurement Notes

Verify that the ordering suffix NSR corresponds to the specific tape-and-reel packaging configuration required for automated assembly processes. Confirm compliance with RoHS3 standards and ensure the component meets the specified industrial temperature requirements for the target application environment.

Selection Notes

Select this component when a dual-channel solution for generating fixed-duration pulses is required without retriggering capabilities. Consider the 16-SOIC package for space-constrained surface-mount designs. Evaluate the 45 ns propagation delay against system timing constraints to ensure signal integrity.

Part Context

This part belongs to the SN74LS221 family of dual non-retriggerable one-shots. It serves as a surface-mount variant of the through-hole SN74LS221N, offering identical logical functionality while adapting to modern PCB assembly techniques via the SOIC-16 footprint.

Replacement Considerations

SN74LS221DR is a verified direct substitute featuring identical specifications in a compatible SOIC-16 package format.