SN74AS258DR

Overview

The SN74AS258DR is a quad 2-to-1 data selector/multiplexer from the Texas Instruments AS logic family, housed in a 16-pin SOIC (D) package. It operates on a single 4.5 V to 5.5 V supply and supports an operating temperature range of 0°C to 70°C. The device features three-state outputs with high-level output current of -15 mA and low-level output current of 48 mA. Propagation delays are specified between 1 ns and 10 ns depending on input path.

Feature Summary

• Provides bus interface capability by multiplexing signals from four independent 2-input data sources to four output lines.
• Features three-state outputs that isolate data lines when the output-enable input is at a high logic level.
• Designed for direct interfacing with system buses in high-performance digital architectures.

Applications

• Multiplexing 4-bit data sources to 4-output data lines in bus-organized systems
• Providing bus interface connections from multiple signal sources
• Direct interfacing with system buses

Procurement Notes

Verify the specific ordering suffix 'DR' corresponds to the SOIC-16 tape-and-reel packaging configuration. Confirm the component status as active production within the manufacturer's official documentation before finalizing procurement plans.

Selection Notes

Select this component for applications requiring fast switching speeds and high drive currents within standard industrial temperature limits. Ensure the design accommodates the 4.5 V to 5.5 V supply voltage requirements and utilizes the 16-pin surface-mount footprint.

Part Context

This part belongs to the SN74AS258 series, which includes variants such as SN74ALS258A and SN74AS257. While sharing similar functional descriptions, these variants differ in electrical characteristics, speed, and power consumption specifications defined by their respective logic families.

Replacement Considerations

SN74ALS258AD

FAQ

How does the output-enable input affect the three-state outputs?

When the output-enable (OE) input is at a high logic level, the three-state outputs do not load the data lines, effectively isolating them.

What is the maximum low-level output current for this device?

The recommended operating conditions specify a maximum low-level output current (IOL) of 48 mA.