DM74AS240WM

Overview

The DM74AS240WM is an octal bus driver utilizing Advanced Schottky technology, housed in a 20-lead Small Outline Integrated Circuit (SOIC) package. It operates within a supply voltage range of 4.5V to 5.5V and supports free air temperatures from 0°C to +70°C. The device features eight three-state buffers with four sharing a common enable gate. Key electrical parameters include a maximum propagation delay of 6.5ns at VCC=4.5V, high-level output current of -15mA, and low-level output current of 64mA.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process for improved switching performance
• Functional and pin-compatible with standard 74LS and Schottky counterparts
• Low impedance outputs capable of driving terminated transmission lines down to 133 ohms
• Specified to interface directly with CMOS logic families

Applications

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

Procurement Notes

Verify the specific ordering suffix 'WM' corresponds to the SOIC-20 package configuration required for your design. Confirm that the component source aligns with the original Fairchild Semiconductor specifications or authorized onsemi lineage, as manufacturing rights have transferred. Ensure the procurement channel provides valid datasheet references matching DS006298 to guarantee parameter accuracy.

Selection Notes

Select this component when bidirectional or unidirectional buffering is required for memory or microprocessor buses. It is suitable for applications needing high-speed switching with lower power dissipation than standard Schottky logic. Consider the 20-pin SOIC footprint constraints and the specific 4.5V to 5.5V operating voltage window during circuit design.

Part Context

This part belongs to the DM74AS240/244 family of 3-State Bus Drivers/Receivers. While originally manufactured by Fairchild Semiconductor, the product line is now managed under onsemi. The 'WM' suffix specifically denotes the 20-lead SOIC package variant, distinguishing it from the PDIP 'N' package version.

Replacement Considerations

SN74AS240AN (Texas Instruments)

FAQ

Is the DM74AS240WM compatible with 74LS logic?

Yes, the device is functionally and pin-compatible with 74LS and Schottky counterparts.

What is the maximum propagation delay specified?

The maximum propagation delay is 6.5ns when measured from input A to output Y at a supply voltage of 4.5V.