SN74AS250ADW

Overview

The SN74AS250ADW is a 24-pin plastic small-outline (DW) device from the Texas Instruments AS logic family. It functions as a 1-of-16 data selector/multiplexer with an inverting output. The component operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C. Key electrical parameters include a high-level output current of -15 mA, a low-level output current of 48 mA, and a typical static supply current of 31 mA at 5.5 V. Propagation delays from data inputs to the output range from 2 ns to 9.5 ns, while control input delays vary between 1.5 ns and 15.5 ns.

Feature Summary

• Provides full binary decoding to select one of sixteen data inputs or sources for use as an input with an inverting output.
• Features buffered 3-state bus driver inputs that permit multiplexing from multiple lines to a single line.
• Includes a buffered output-enable input that places the output in a high-impedance state when activated, preventing significant loading or driving of bus lines.

Applications

• Boolean function generation
• Parallel-to-serial conversion
• Data source selection

Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the plastic small-outline package configuration required for your design. Confirm that the commercial temperature rating of 0°C to 70°C aligns with your operational environment, as military variants exist. Ensure compatibility with the 4.5 V to 5.5 V supply voltage range and validate pinout alignment against your PCB footprint specifications before finalizing procurement.

Selection Notes

Select this component when a fast, 1-of-16 multiplexer with 3-state outputs is required for standard commercial applications. The AS series offers higher speed performance compared to standard TTL equivalents. Consider the DW package dimensions for board space constraints. Verify that the inverting output polarity matches the system logic requirements. Evaluate the 48 mA low-level sink capability against the load requirements of the destination circuitry.

Part Context

This device belongs to the Texas Instruments SN74AS250A series, which utilizes Advanced Schottky (AS) bipolar technology. The series is designed for high-speed digital applications requiring robust signal integrity. The SN74AS250A specifically targets commercial environments, contrasting with the SN54AS250A variant characterized for the full military temperature range. It serves as a specialized data routing solution within the broader logic IC portfolio.

Replacement Considerations

Public confirmed substitute part numbers: SN54AS250AJT (Military grade, Ceramic DIP). Note that SN54AS250AJT differs in temperature range (-55°C to 125°C) and package type (JT vs DW).