SN74AS258D

Overview

The SN74AS258D is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments in the 74AS logic series. It features four independent multiplexers with three-state outputs, designed for bus-organized systems. The device operates on a single power supply ranging from 4.5V to 5.5V and supports an operating temperature range of 0°C to 70°C. Packaged in a 16-pin Small Outline (D) format, it provides high-speed signal selection capabilities suitable for high-performance digital applications.

Feature Summary

• Provides four independent channels for selecting between two input lines per channel
• Features three-state outputs that isolate data lines when disabled
• Designed for direct interface with system buses in high-performance environments

Applications

• Multiplexing signals from multiple sources to shared data lines
• Bus interface implementation in high-performance computing systems
• Data routing within organized bus architectures

Procurement Notes

Verify the specific package type and manufacturer status before procurement. Confirm RoHS compliance and moisture sensitivity levels against current project requirements. Ensure the ordering suffix matches the desired packaging configuration. Cross-reference the datasheet revision date to validate electrical characteristics and switching timings.

Selection Notes

Select this component for applications requiring fast switching speeds and high drive currents compared to standard ALS logic. The AS series offers superior performance metrics while maintaining compatibility with existing 74-series pinouts. Evaluate thermal dissipation requirements for the SOIC package under maximum load conditions.

Part Context

This part belongs to the Texas Instruments 74AS family, which represents a high-speed variant of the standard 74-series logic. The 'S' denotes the Advanced Schottky technology, providing faster propagation delays than the ALS counterpart. The 'D' suffix specifically identifies the plastic small-outline package format.

Replacement Considerations

SN74ALS258D is a functional alternative within the same family offering similar pinout compatibility but with different speed and power characteristics.