SN74LS221DBR

Overview

The SN74LS221DBR is a dual monostable multivibrator integrated circuit manufactured by Texas Instruments. It belongs to the 74LS logic series and features two independent circuits within a single package. The device operates with a supply voltage range of 4.75 V to 5.25 V and supports a propagation delay of 45 ns. It utilizes a 16-SOIC surface-mount package with a width of 3.90 mm. The component provides an output current capability of 8 mA for low-level states and 400 µA for high-level states, functioning within a commercial temperature range of 0°C to 70°C.

Feature Summary

• Contains two independent monostable multivibrator circuits in a single package
• Features Schmitt-trigger inputs for noise immunity
• Supports direct triggering from push-button switches or zero-delay clock signals
• Provides internal timing resistor and capacitor connections

Applications

• Timing pulse generation
• Frequency division
• Pulse widening
• Debouncing switches

Procurement Notes

Verify the specific ordering suffix to confirm the package type and tape-and-reel specifications. Ensure the component meets RoHS3 compliance requirements if applicable to your manufacturing standards. Confirm that the 16-SOIC footprint matches your PCB design constraints. Check for any recent Product Change Notifications regarding assembly or material updates.

Selection Notes

Select this component when dual independent monostable functions are required in a compact surface-mount format. Consider the 45 ns propagation delay and 74LS logic speed characteristics against system timing requirements. Evaluate the 4.75 V to 5.25 V operating voltage range for compatibility with standard 5 V logic systems.

Part Context

This part is part of the SN54/74221 family of dual monostable multivibrators. It shares functional similarities with other variants like the SN74LS221DR and SN74LS221NSR, differing primarily in packaging and reel specifications. The device is designed for general-purpose timing applications within the standard TTL logic ecosystem.

Replacement Considerations

Direct substitutes include SN74LS221DR and SN74LS221NSRE4. Verify pinout compatibility and electrical parameters before substitution.