DM74LS244N

Overview

The DM74LS244N is an octal buffer and line driver manufactured by onsemi, formerly Fairchild Semiconductor. It features 3-state outputs and operates within a supply voltage range of 4.75V to 5.25V. The device supports a commercial temperature range from 0°C to +70°C. It utilizes a 20-lead Plastic Dual-In-Line Package (PDIP). Electrical characteristics include a typical propagation delay of 18 ns at 45 pF load and a low-level output current capability of 24 mA.

Feature Summary

• Features 3-state outputs that allow direct connection to bus lines for efficient data transmission.
• Incorporates PNP inputs designed to reduce DC loading on bus lines while improving noise margins through hysteresis.

Applications

• Memory-address drivers
• Clock drivers
• Bus-oriented transmitters and receivers

Procurement Notes

Verify the manufacturer origin as onsemi or its predecessor Fairchild Semiconductor when sourcing this component. Confirm the package type matches the required 20-lead PDIP specification. Ensure the operating temperature range meets the commercial requirements of the target application environment.

Selection Notes

Select this component for applications requiring high fanout and improved noise rejection in digital systems. The inclusion of input hysteresis makes it suitable for driving terminated lines down to 133 ohms. Consider the specific propagation delays and power dissipation values when designing for speed-critical or thermally constrained circuits.

Part Context

This part belongs to the 74LS logic family, characterized by low-power Schottky technology. It serves as a standard octal buffer solution for general-purpose digital interfacing tasks where bus isolation and signal integrity are prioritized over ultra-high-speed performance.

Replacement Considerations

Direct replacements may include other octal 3-state buffers from the 74LS series such as the SN74LS244. Verify pin compatibility and electrical specifications before substituting with devices from different manufacturers.