DM74AS157MX

Overview

The DM74AS157MX is a Quad 1 of 2 Line Data Selector/Multiplexer manufactured by onsemi, utilizing the Advanced Schottky (AS) logic series. It features a 16-Lead Small Outline Integrated Circuit (SOIC) package with JEDEC MS-012 dimensions. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a free air operating temperature range from 0 °C to +70 °C. It provides four independent data selection circuits, routing true data outputs based on select inputs and a strobe control signal.

Feature Summary

• Contains four independent 1-of-2 line data selectors/multiplexers for parallel data routing
• Utilizes advanced oxide-isolated, ion-implanted Schottky TTL process technology
• Functionally and pin-for-pin compatible with Schottky, Low Power Schottky, and Advanced Low Power Schottky TTL counterparts
• Includes a separate STROBE input to control data output enablement

Applications

• Multiplexing dual data buses
• Expanding any data input point in digital systems
• Implementing general four functions of two variables where one variable is common
• Source programming counters

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm the specific ordering suffix 'X' indicates tape and reel packaging as documented in the datasheet. Ensure compatibility with existing AS logic family designs requiring full pinout equivalence. Validate that environmental conditions remain within the specified 0 °C to +70 °C operating range.

Selection Notes

Select this component when high-speed switching performance is required compared to standard Schottky or Low Power Schottky alternatives. The device offers improved AC performance characteristics suitable for demanding digital applications. Consider the SOIC package format for surface mount assembly requirements. Verify that the true data output characteristic aligns with system logic requirements rather than inverted outputs.

Part Context

This part belongs to the DM74AS157/DM74AS158 family of quad multiplexers. The DM74AS157 variant specifically presents true data to the outputs, whereas the DM74AS158 presents inverted data to minimize propagation delay time. Both share identical pin configurations and functional logic tables, differing primarily in output polarity.

Replacement Considerations

Direct substitutes include SN74AS157D from Texas Instruments. Parameter equivalent options such as SN74AS298AD are also available but may require circuit adaptation.