DM74ALS251MX

Overview

The DM74ALS251MX is an octal 3-state data selector/multiplexer manufactured by Fairchild Semiconductor under the Advanced Low-power Schottky (ALS) logic family. It features eight non-inverting inputs, three address select lines, and a single tri-state output. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports surface-mount installation in a 16-lead Small Outline Integrated Circuit (SOIC) package. Propagation delay is specified at 15 ns at 5 V, with an operating temperature range from 0°C to +70°C.

Feature Summary

• Provides high-speed data selection for eight input channels using three-bit addressing
• Features tri-state outputs to facilitate bus-oriented communication systems
• Utilizes advanced oxide-isolated ion-implanted Schottky process for low power consumption

Applications

• Memory address decoding
• Data routing in microprocessor systems
• Bus-oriented switching applications

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to potential availability constraints. Confirm RoHS compliance status and specific packaging variants against current datasheet revisions before procurement. Ensure storage conditions adhere to moisture sensitivity levels defined in the official documentation to prevent damage prior to assembly.

Selection Notes

Select this component when designing systems requiring fast, low-power multiplexing of eight digital signals. The ALS series offers improved speed over standard LS logic while maintaining lower power dissipation than original Schottky TTL devices. Verify that the required SOIC-16 footprint aligns with the PCB layout and that the 3-state output capability matches the system's bus isolation requirements.

Part Context

This part belongs to the Fairchild DM74ALS series, which implements the Advanced Low-power Schottky logic standard. These components are designed as drop-in replacements for older Schottky and Low-power Schottky TTL families, offering enhanced performance characteristics such as reduced propagation delay and lower power usage without altering pin configurations or logical functions.

Replacement Considerations

Functionally equivalent parts include the DM74ALS251N (DIP package) and cross-manufacturer equivalents like the SN74ALS251. Verify package compatibility and ensure electrical specifications match the design requirements when substituting.