DM74AS244N

Overview

The DM74AS244N is an octal bus driver/receiver utilizing Advanced Schottky (AS) technology. It features eight three-state buffers organized with four buffers sharing a common three-state enable gate. The device provides bidirectional or unidirectional buffer interfaces for memory, microprocessor, and communication systems. It offers low output impedance suitable for driving terminated transmission lines down to 133 ohms and high input impedance to minimize line loading. The component is housed in a 20-pin package.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process
• Improved switching performance with reduced power dissipation compared to standard Schottky counterparts
• Functional and pin compatible with 74LS and Schottky logic families
• Specified to interface with CMOS at V OH = V CC − 2V

Applications

• Memory system buffering
• Microprocessor system interfacing
• Communication system data buses

Procurement Notes

Verify the specific suffix 'N' corresponds to the N20A plastic DIP package configuration as documented in official Fairchild ordering codes. Confirm that the component meets the required functional compatibility with existing 74LS and Schottky designs if replacing legacy parts. Ensure the procurement source provides the original manufacturer datasheet to validate the Advance Schottky process specifications and electrical characteristics.

Selection Notes

Select this component when a non-inverting octal buffer with three-state control is required for high-speed digital applications. It serves as a direct replacement for similar AS family devices where bidirectional or unidirectional data flow management is necessary. Consider its compatibility with CMOS inputs if interfacing with lower voltage logic families, noting the specified V OH requirements.

Part Context

This part belongs to the DM74AS series of Advance Schottky logic circuits manufactured by Fairchild Semiconductor. It shares the same logical function and pinout as the DM74AS240 but differs in inversion polarity. The series is designed to bridge the gap between speed and power consumption in standard TTL applications.

Replacement Considerations

The DM74AS244N is functionally and pin-compatible with other 74AS and 74LS variants. Verify equivalent part numbers from other manufacturers within the 74AS family to ensure identical electrical parameters and package dimensions before substitution.