DM74AS648WMX

Overview

The DM74AS648WMX is an octal bus transceiver belonging to the Advanced Schottky (AS) logic family, manufactured by Fairchild Semiconductor. It features eight bidirectional data paths with inverted outputs and three-state control. The device operates within a supply voltage range of 4.5V to 5.5V and supports a maximum operating temperature of 70°C. It is housed in a 24-pin SOIC package.

Feature Summary

• Provides bidirectional data transmission between external buses and internal registers via octal configuration.
• Features inverted outputs for signal compatibility in specific logic architectures.
• Incorporates three-state output capability to isolate the bus when disabled.

Applications

• Memory systems requiring high-speed data transfer
• Microprocessor-based control architectures
• Asynchronous bidirectional data bus interfaces

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm that the suffix 'MX' corresponds to the SOIC-24 surface-mount package variant. Ensure compliance with RoHS directives if required by the target assembly process. Validate lot traceability against current manufacturing standards.

Selection Notes

Select this component for applications requiring fast switching speeds characteristic of the AS series. It serves as a suitable interface for driving terminated transmission lines due to low output impedance. Consider the inverted output polarity during schematic design to ensure correct logical alignment with downstream components.

Part Context

This part belongs to the DM74ASxx series of Advanced Schottky TTL logic devices. These circuits utilize an oxide-isolated, ion-implanted process to achieve improved switching performance and reduced power dissipation compared to standard Schottky counterparts while maintaining functional pin compatibility.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with equivalent SN74AS641 variants from other manufacturers based on electrical specifications and pinout alignment.