DM74ALS540AN

Overview

The DM74ALS540AN is an octal bus driver belonging to the Advanced Low-power Schottky (ALS) logic family. It features eight non-inverting buffers with three-state outputs, designed for high-speed data transmission in microprocessor systems. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a wide operating temperature range from -40 °C to +85 °C. It utilizes a 20-pin Dual In-line Package (DIP) construction.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process for improved performance
• Three-state outputs allow effective isolation of buses when disabled
• Functionally and pin-for-pin compatible with standard Schottky and low-power Schottky TTL counterparts

Applications

• Memory systems
• Microprocessor systems
• Asynchronous bidirectional data buses

Procurement Notes

Verify the specific manufacturer source, as Fairchild Semiconductor has undergone corporate restructuring and its logic assets were acquired by ON Semiconductor. Confirm that the component matches the original Fairchild specifications and package details. Ensure the part number suffix 'AN' correctly denotes the leaded plastic DIP-20 configuration required for your design.

Selection Notes

Select this component when designing systems requiring high-speed bus driving with advanced low-power characteristics. It serves as a direct replacement for older 74S or 74LS series drivers where lower power consumption and faster switching speeds are necessary. Ensure the application environment supports the specified voltage and temperature ranges.

Part Context

This component is part of the extensive DM74ALS series, which represents a significant evolution in TTL technology by combining the speed of Schottky devices with reduced power dissipation. The ALS family was widely adopted in the late 1980s and 1990s for digital logic applications requiring reliable performance in computing and industrial control environments.

Replacement Considerations

Verified substitutes include the DM74ALS540N and the DM74ALS540M. These parts share identical logical functions and pinouts, differing primarily in packaging style such as DIP or SOIC.