DM74LS126AN

Overview

The DM74LS126AN is a quad 3-state buffer manufactured by onsemi, housed in a 14-lead Plastic Dual-In-Line (PDIP) package. It operates within a supply voltage range of 4.75V to 5.25V and supports an operating temperature range of 0°C to +70°C. The device features non-inverting logic with high-level output voltage of 2.4V minimum and low-level output voltage of 0.5V maximum at specified loads. Propagation delays are typically 21ns for low-to-high and 22ns for high-to-low transitions under 50pF load conditions.

Feature Summary

• Contains four independent non-inverting buffer gates providing signal isolation and driving capability.
• Outputs exhibit 3-state functionality, presenting high-impedance states when disabled to prevent bus contention.
• Disable time is shorter than enable time to minimize the risk of outputs attempting to drive common buses to opposite logic levels simultaneously.

Applications

• Driving bus lines without requiring external resistors due to additional drive capability.
• Isolating signals in digital circuits where controlled output impedance is required.
• General-purpose buffering in systems utilizing standard LS logic families.

Procurement Notes

Verify component authenticity and datasheet revision status prior to integration. Confirm that the PDIP package dimensions align with existing PCB footprints. Ensure design margins accommodate the specified electrical characteristics across the full operating temperature range. Validate that the 3-state control logic meets system timing requirements for enable and disable sequences.

Selection Notes

Select this component for applications requiring isolated non-inverting buffering with defined high-impedance states. Consider the specific propagation delay limits and output current capabilities relative to the target load capacitance. Verify compatibility with the system's supply voltage tolerances and thermal environment constraints before finalizing the design.

Part Context

This part belongs to the DM74LS series of logic integrated circuits produced by onsemi. It serves as a standard buffer solution within the TTL-compatible logic family. The device provides a reliable method for managing signal flow in digital architectures while maintaining compatibility with other components in the same logical ecosystem.

Replacement Considerations

Direct substitutes include the DM74LS126AM variant which utilizes a Small Outline Integrated Circuit (SOIC) package instead of the PDIP configuration. Both variants share identical electrical specifications and pinout configurations, allowing for functional interchangeability if mechanical footprint constraints permit.