DM74ALS540ASJX

Overview

The DM74ALS540ASJX is an octal inverting buffer and line driver featuring 3-STATE outputs, manufactured by onsemi. It utilizes the Advanced Schottky TTL logic series and operates within a supply voltage range of 4.5V to 5.5V. The device provides a propagation delay of 2ns to 12ns and supports low-level output currents up to 24mA. Designed for enhanced printed circuit board layout, it features inputs and outputs positioned on opposite sides of the package. The component is housed in a 20-Lead Small Outline Package (SOP) with a wide body.

Feature Summary

• Features data flow-thru pinout configuration with inputs and outputs located on opposite sides of the package to enhance printed circuit board layout efficiency.
• Incorporates P-N-P input structures that reduce DC loading on driving circuits while maintaining compatibility with standard logic levels.
• Utilizes a 2-input NOR gate for 3-STATE control, placing all eight outputs in a high impedance state if either control input is HIGH.

Applications

• High-performance memory address drivers
• Clock drivers and buffering
• Bus-oriented communications

Procurement Notes

Verify the specific ordering suffix 'SJX' against current manufacturer documentation to confirm package dimensions and tape-and-reel specifications. Confirm RoHS compliance status as indicated in official datasheets. Ensure the procurement channel sources from authorized distributors to guarantee authenticity and traceability for this discontinued or legacy component.

Selection Notes

Select this component when a bidirectional octal buffer with inverted logic is required for bus applications. The 3-STATE capability allows multiple devices to share a common data line without interference. Consider the specific SOP package width and thermal characteristics relative to other available packages like SOIC or PDIP for mechanical fit.

Part Context

This part belongs to the DM74ALS540A family of octal buffers. It shares functional similarities with the DM74ALS240A but offers a distinct pinout arrangement. The ALS series represents an advancement over standard TTL, providing faster switching speeds and lower power consumption. This specific variant is designed for general-purpose digital signal buffering in industrial and commercial equipment.

Replacement Considerations

SN74ALS540D Texas Instruments