SN74AS258N

Overview

The SN74AS258N is a quad 2-to-1 data selector/multiplexer with 3-state outputs, manufactured by Texas Instruments. It belongs to the AS logic series and operates within a supply voltage range of 4.5 V to 5.5 V. The device features four independent multiplexing circuits, each selecting between two data inputs (A and B) based on a common select line (A/B). Propagation delays from data inputs to output range from 1 ns to 6.5 ns, while output enable/disable times range from 2 ns to 10 ns. It is housed in a standard plastic 16-pin DIP package and supports operation from 0°C to 70°C.

Feature Summary

• Provides bus interface capabilities from multiple sources in high-performance systems
• Features 3-state outputs that do not load data lines when the output-enable input is at a high logic level
• Designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems

Applications

• Multiplexing signals from 4-bit data sources to 4-output data lines
• Providing bus interface from multiple sources in high-performance systems
• Bus-organized system signal routing

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm lead finish, moisture sensitivity rating, and operational temperature range. Ensure the selected variant matches the required packaging type for your assembly process. Confirm RoHS compliance status if environmental regulations apply to your manufacturing facility.

Selection Notes

Select this component for applications requiring fast switching speeds and high drive capability within the AS logic family. Verify that the 3-state output configuration aligns with your bus architecture requirements. Ensure the operating temperature range meets your environmental specifications and that the power supply voltage remains within the recommended 4.5 V to 5.5 V limits.

Part Context

This part is part of the SN74AS25x series, which includes the SN74AS257 (non-inverting) and SN74AS258 (inverting) variants. Both share similar electrical characteristics and pinouts but differ in output polarity. The SN74AS258 provides inverted outputs relative to the selected input, distinguishing it from the non-inverting SN74AS257.

Replacement Considerations

SN74ALS258N is a compatible alternative within the same datasheet family, offering similar functionality with different electrical characteristics.