SN74AS257DRG4

Overview

The SN74AS257DRG4 is a quad 2-to-1 data selector/multiplexer from the Texas Instruments AS logic series. It features four independent multiplexers with three-state outputs, housed in a 16-pin SOIC package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a propagation delay of 12 ns. It is designed for surface-mount installation and functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrates four independent 2-to-1 multiplexers within a single integrated circuit
• Provides high-impedance three-state outputs for effective bus line driving
• Utilizes Schottky transistor technology to achieve fast switching speeds

Applications

• Data routing in digital communication systems
• Signal selection in microprocessor-based control circuits
• Address decoding and data path configuration

Procurement Notes

Verify the specific suffix 'DG4' against the manufacturer's current datasheet to confirm compliance with RoHS directives and lead-free manufacturing standards. Ensure the selected package variant matches the required PCB footprint and thermal management specifications for the target application environment.

Selection Notes

Select this component when high-speed data selection is required within standard 5V logic systems. The AS series offers superior speed compared to standard TTL variants while maintaining compatible pinouts. Verify that the three-state output capability aligns with the system's bus architecture requirements.

Part Context

This part belongs to the SN74AS257 family of multiplexers. It shares functional similarities with the SN74F257 but provides faster propagation delays due to its advanced Schottky technology. The DRG4 designation indicates a tape-and-reel packaging format suitable for automated surface-mount assembly processes.

Replacement Considerations

The SN74AS257D serves as a tube-packaged alternative with identical electrical characteristics. For higher speed requirements, the SN74F257 series may be considered if timing constraints allow.