DM74ALS648NT

Overview

The DM74ALS648NT is a high-speed CMOS transceiver manufactured by onsemi, belonging to the 74ALS logic family. It provides bidirectional data transmission between two buses with three-state outputs. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum propagation delay of 12 ns at 5 V. It features low power consumption typical of ALS technology and is housed in a 24-pin Dual In-Line Package (DIP). The component is designed for industrial temperature ranges from -40°C to +85°C.

Feature Summary

• Bidirectional data bus transceiver functionality
• Three-state output capability for bus isolation
• High-speed operation with low propagation delay
• Low power dissipation characteristic of ALS series

Applications

• Memory mapping control systems
• Data bus drivers for instrumentation
• Bidirectional gate and interface circuits
• Bus-oriented communications links

Procurement Notes

Verify the specific manufacturer lot code and date code upon receipt to ensure compliance with quality standards. Confirm that the package type matches the required 24-pin DIP configuration for your PCB layout. Check for any obsolescence notices or lifecycle status updates from onsemi before finalizing procurement plans.

Selection Notes

Select this component when bidirectional data transfer with bus isolation is required in high-speed digital systems. Ensure the system voltage aligns with the 4.5 V to 5.5 V operating range. Consider the 24-pin DIP package constraints for board space and mounting requirements compared to surface-mount alternatives.

Part Context

This part belongs to the 74ALS (Advanced Low-power Schottky) logic family, known for improved speed over standard 74LS devices while maintaining lower power consumption than 74AS. The DM prefix indicates a military-grade or enhanced reliability variant depending on the specific manufacturer's coding conventions at the time of production.

Replacement Considerations

Direct pin-compatible substitutes include other 74ALS648 variants from different manufacturers such as Texas Instruments or NXP, provided they meet the same electrical specifications and package dimensions. Verify compatibility with existing design-in documentation.