DM74AS240N

Overview

The DM74AS240N is an octal three-state buffer and line driver utilizing Advanced Schottky (AS) TTL technology. It features two independent four-bit buffers, each with a common three-state enable control. The device operates within a supply voltage range of 4.5V to 5.5V and supports bidirectional or unidirectional bus interfacing. It provides low-impedance outputs capable of driving terminated transmission lines down to 133Ω while maintaining high-impedance inputs to minimize line loading.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky process for improved switching performance
• Low output impedance suitable for driving terminated transmission lines
• High input impedance prevents significant loading of the transmission line
• Functional and pin-compatible with standard 74LS and Schottky counterparts

Applications

• Memory system bus buffering
• Microprocessor interface circuits
• Communication systems data routing

Procurement Notes

Verify the specific manufacturer source, as Fairchild Semiconductor assets were acquired by onsemi. Confirm that the component meets current environmental compliance standards required for the target application. Ensure the package type matches the design footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when high-speed logic buffering is required in systems compatible with 74LS or standard Schottky logic families. The Advanced Schottky technology offers superior speed compared to LS variants while maintaining lower power dissipation than standard Schottky devices. Ensure the design accommodates the specific electrical characteristics of the AS series.

Part Context

This part belongs to the DM74AS family of Advanced Schottky logic integrated circuits. It shares functional similarities with the non-inverting DM74AS244 variant but includes inverted outputs. The device is housed in a 20-pin plastic dual in-line package (PDIP), providing a compact solution for octal bus applications in legacy and industrial electronic designs.

Replacement Considerations

SN74AS240N from Texas Instruments serves as a direct functional substitute. Verify pinout compatibility and electrical specifications against the original datasheet before implementation.