DM74ALS240AWMX

Overview

The DM74ALS240AWMX is an octal 3-STATE bus driver manufactured by onsemi, utilizing the advanced low power oxide-isolated ion-implanted Schottky TTL process. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature from 0°C to +70°C. The device features two separate groups of four buffers with symmetric enable gating controlled by logic LOW inputs. It provides a low level drive current of 24mA and maintains outputs in a high impedance state during power supply ramp-up or ramp-down to eliminate bus glitching.

Feature Summary

• Octal 3-STATE bus drivers designed for flexible implementation in memory, microprocessor, or communication systems.
• Functional and pin compatible with the DM74LS counterpart while offering improved switching performance with less power dissipation.
• Switching response specifications are guaranteed over the full temperature and VCC supply range into 500Ω and 50pF loads.
• PNP input design reduces input loading compared to standard TTL devices.

Applications

• Bus interface implementation with memory systems
• Microprocessor system interconnects
• Communication systems data transmission

Procurement Notes

Verify component authenticity through authorized distributors as this part may be discontinued. Confirm package integrity upon receipt, specifically checking for damage to the 20-Lead Small Outline Integrated Circuit (SOIC) housing. Ensure compatibility with existing PCB footprints matching the M20B package description before final integration.

Selection Notes

Select this component when designing systems requiring octal bus buffering with 3-STATE control. It serves as a direct functional replacement for DM74LS counterparts where lower power consumption and faster switching speeds are required. Verify that the symmetric enable gating logic aligns with the system's control architecture.

Part Context

This device belongs to the 74ALS series of logic integrated circuits, known for advanced low power Schottky technology. It is part of a family including the DM74ALS241A, which shares identical physical characteristics but utilizes complementary enable gating instead of symmetric logic. Both variants share the same SOIC-20 package options.

Replacement Considerations

SN74ALS240AN Texas Instruments

FAQ

How does the DM74ALS240A handle power supply transitions?

The 3-STATE circuitry contains a feature that maintains the buffer outputs in a high impedance state during power supply ramp-up or ramp-down, eliminating bus glitching problems.

What is the difference between the DM74ALS240A and DM74ALS241A?

The DM74ALS240A control inputs symmetrically enable the respective outputs when set to logic LOW, whereas the DM74ALS241A has complementary enable gating.