DM74ALS251M

Overview

The DM74ALS251M is an octal data selector/multiplexer manufactured by Fairchild Semiconductor under the Advanced Low-Power Schottky (ALS) logic series. It features eight non-inverting data inputs, three binary select lines, and a single 3-state output. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a propagation delay of 15 ns at 4.5 V to 5.5 V and a maximum quiescent current of 2 mA. It is housed in a 16-lead Small Outline Package (SOP) and supports surface mount installation.

Feature Summary

• Advanced Low-Power Schottky process for high-speed switching with reduced power consumption
• Octal configuration providing eight independent data input channels
• Three-bit binary selection mechanism for precise channel routing
• Three-state output capability allowing bus isolation when disabled

Applications

• High-performance memory decoding systems
• Data transmission and routing applications
• Microprocessor system data buses
• Asynchronous bidirectional data communication interfaces

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm package integrity and pin alignment against the SOP-16 specification. Review the latest datasheet for RoHS compliance status and environmental certifications. Ensure storage conditions meet moisture sensitivity level requirements prior to assembly.

Selection Notes

Select this component for designs requiring fast signal switching with low static power dissipation. The ALS series offers improved AC performance compared to standard LS counterparts. Verify that the 3-state output aligns with the target bus architecture. Ensure the operating temperature range meets the specific environmental constraints of the application.

Part Context

This part belongs to the Fairchild DM74ALS family, which utilizes ion-implanted Schottky TTL technology. The series is designed to bridge the performance gap between standard TTL and faster logic families while maintaining lower power profiles. It maintains functional compatibility with legacy Schottky and Low-Power Schottky circuits.

Replacement Considerations

Check for direct pin-compatible alternatives within the same ALS family. Verify if newer generations from onsemi offer equivalent specifications. Ensure substitute parts maintain the required 3-state output functionality and propagation delay limits.