7604201EA

Multivibrators Overview

The SN54LS221J is a dual monostable multivibrator manufactured by Texas Instruments, designed for military-grade applications. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -55°C to 125°C. The device features Schmitt-trigger inputs for noise immunity and allows pulse width adjustment via external timing components. Maximum output pulse lengths are 21 ns for the standard SN54221 and 49 ns for the SN54LS221 variant.

Multivibrators Feature Summary

• Features dual independent monostable multivibrators with negative-transition-triggered and positive-transition-triggered inputs.
• Incorporates Schmitt-trigger input circuitry on the B input to provide jitter-free triggering from slow transition rates.
• Provides overriding clear functionality that terminates the output pulse immediately upon activation.
• Maintains high immunity to supply voltage noise through internal latching circuitry.

Multivibrators Applications

• Military-grade timing circuits requiring extended temperature stability
• Pulse generation systems utilizing external RC timing networks
• DC-triggered reset signal generation in digital logic systems

Multivibrators Procurement Notes

Verify the specific ordering suffix against the Package Option Addendum to confirm the exact package type, such as CDIP (J) or LCCC (FK), and ensure the material type matches project requirements. Confirm RoHS compliance status and lead finish specifications directly with the manufacturer documentation prior to procurement.

Multivibrators Selection Notes

Select this component when military-grade reliability and wide temperature operation are required. Ensure the design accommodates the specific pinout compatibility with legacy SN54123/SN74123 devices if substitution is intended. Verify that external timing resistor and capacitor values fall within the recommended jitter-free ranges for the selected supply voltage.

Multivibrators Part Context

This part belongs to the SN54/74221 family of dual monostable multivibrators. It serves as a direct pin-compatible replacement for the SN54123 and SN74123 series, offering virtually identical electrical characteristics while providing distinct trigger capabilities. The SN54LS221 variant offers lower power consumption compared to the standard bipolar version.

Multivibrators Replacement Considerations

Public confirmed substitute part numbers include SN54221J, SNJ54LS221FK, and JM38510/31402BEA. These parts share identical functional characteristics and pin assignments, allowing for direct substitution in existing designs without schematic modifications.