DM74AS240WM

Overview

The DM74AS240WM is an octal 3-STATE bus driver/receiver from the Advanced Schottky (AS) family. It features eight buffers organized into two groups of four, each with a common enable gate. The device operates within a supply voltage range of 4.5V to 5.5V and supports bidirectional or unidirectional buffering. It utilizes an advanced oxide-isolated, ion-implanted Schottky TTL process for improved switching performance and reduced power dissipation compared to standard Schottky counterparts.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process
• Low output impedance suitable for driving terminated transmission lines down to 133Ω
• High input impedance to minimize transmission line loading
• Functional and pin compatible with 74LS and standard Schottky logic families

Applications

• Memory system buffer interfaces
• Microprocessor system data routing
• Communication systems signal conditioning

Procurement Notes

Verify the specific manufacturer source, as Fairchild Semiconductor assets are now managed by onsemi. Confirm the package marking and date code align with current production standards. Ensure the component meets RoHS compliance requirements if applicable to the target assembly. Cross-reference the datasheet revision to confirm electrical characteristics match the design specifications.

Selection Notes

Select this component when high-speed buffering with low power consumption is required in TTL-based designs. It serves as a direct replacement for standard Schottky drivers while offering better performance. Consider the bidirectional capability and independent enable controls for flexible bus architecture implementation in complex digital systems.

Part Context

This part belongs to the DM74AS series, which represents the Advanced Schottky logic family known for speed and efficiency. The 'WM' suffix indicates a 20-pin Small Outline Integrated Circuit (SOIC) package. It is functionally related to other AS series components like the DM74AS244, differing primarily in output polarity configuration.

Replacement Considerations

DM74AS244N

FAQ

What is the minimum load impedance the DM74AS240WM can drive?

The output characteristics provide low impedance sufficient to drive terminated transmission lines down to 133Ω.

How are the eight buffers organized in this device?

The package contains eight 3-STATE buffers organized with four buffers having a common 3-STATE enable gate.