SN74AS250ADWE4

Overview

The SN74AS250ADWE4 is a single 1-of-16 data generator and multiplexer housed in a 24-pin Small-Outline (DW) package. It operates on a single supply voltage ranging from 4.5V to 5.5V, with an operating temperature range of 0°C to 70°C. The device features buffered 3-state bus driver inputs and provides symmetrical propagation delays to minimize output transients. Electrical characteristics include a high-level output current of -15mA and a low-level output current of 48mA at VCC = 4.5V.

Feature Summary

• Provides full binary decoding to select one of sixteen data inputs or function as an input buffer with an inverted output.
• Features buffered 3-state outputs that permit cascading from n lines to one line without loading the bus significantly when disabled.
• Utilizes buffered inputs to ensure symmetrical propagation delay times, reducing the possibility of transient occurrences at the output.

Applications

• Boolean Function Generator
• Parallel-to-Serial Converter
• Data Source Selector

Procurement Notes

Verify the component status before procurement, as this specific part number may be obsolete. Confirm that the 24-SOIC package dimensions align with your PCB footprint requirements. Ensure the operating environment remains within the specified commercial temperature limits of 0°C to 70°C. Check for RoHS3 compliance if environmental regulations apply to your assembly process.

Selection Notes

Select this component when a single 1-of-16 multiplexer with 3-state buffering is required. It is suitable for applications needing to reduce output transients through symmetrical propagation delays. Consider the AS logic family for higher speed compared to standard TTL, while ensuring the 5V supply voltage matches your system architecture.

Part Context

This device belongs to the Texas Instruments 74AS series, known for Advanced Schottky TTL technology. The 'A' suffix indicates the enhanced version of the AS series. The DW suffix specifically denotes the plastic Small-Outline package variant. It is part of the broader SN74AS250A family, which includes other packaging options like ceramic DIPs.

Replacement Considerations

SN74AS250ANT

FAQ

How does the OE pin affect internal operations?

Taking the Output Enable (OE) pin high places the output in a high-impedance state. This action does not affect the internal operations of the data selector/multiplexer, allowing new data to be set up while the outputs are disabled.

What is the purpose of the buffered inputs?

The buffered inputs provide symmetrical propagation delay times. This design feature reduces the possibility of transients occurring at the output during signal transitions.