SN74LS221D

Overview

The SN74LS221D is a dual non-retriggerable monostable multivibrator manufactured by Texas Instruments. It belongs to the 74LS logic family and operates within a supply voltage range of 4.75 V to 5.25 V. The device features two independent circuits housed in a 16-pin DIP package. It provides both true and complementary outputs for each circuit, with a typical propagation delay of 45 ns. The component supports an operating temperature range from 0°C to 70°C.

Feature Summary

• Dual independent non-retriggerable monostable multivibrator circuits
• Provides both true and complementary output signals
• Compatible with standard 5V TTL logic systems

Applications

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

Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout compatibility and electrical characteristics. Ensure the manufacturer source matches project requirements. Confirm RoHS compliance status if environmental regulations apply. Validate that the package type aligns with PCB footprint specifications before procurement.

Selection Notes

Select this component when dual isolated pulse generation is required within standard TTL environments. Consider the 45 ns propagation delay for timing constraints. Verify that the DIP-16 package fits the mechanical design. Evaluate power consumption limits relative to other 74LS series devices in the system.

Part Context

This part is part of the broader 74LS221 family, which includes variants like SN74LS221DR and SN74LS221NSR. These variations differ primarily in packaging (SOIC vs. DIP) and reel configurations while maintaining identical logical functionality. The SN74LS221D specifically denotes the through-hole DIP version.

Replacement Considerations

SN74LS221DR

FAQ

Does the SN74LS221D have Schmitt trigger inputs?

No, the SN74LS221D does not feature Schmitt trigger inputs.

What is the maximum supply voltage for this device?

The maximum recommended supply voltage is 5.25 V.