DM74ALS257SJ

Overview

The DM74ALS257SJ is a 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer manufactured by onsemi (formerly Fairchild Semiconductor). It utilizes an Advanced Oxide-Isolated, Ion-Implanted Schottky TTL process. The device operates within a supply voltage range of 4.5V to 5.5V and supports a free air operating temperature range of 0°C to +70°C. It features four independent multiplexers with true data outputs in a 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide.

Feature Summary

• Contains inverters and drivers for full on-chip data selection routed to four 3-STATE outputs.
• Functionally and pin-for-pin compatible with Schottky and Low Power Schottky TTL counterparts.
• Outputs drive bus lines directly, allowing implementation of n-bit paralleled data selectors.
• Switching specifications are guaranteed over the full temperature and VCC range.

Applications

• Routing 4-bit words from one of two sources to four outputs in bus-organized systems.
• Multiplexing dual data buses.
• Expanding any data input point in digital logic circuits.

Procurement Notes

Verify component authenticity through authorized channels due to historical manufacturing origins. Confirm package dimensions match the 16-Lead SOP EIAJ TYPE II specification. Ensure design compatibility with the specified 4.5V to 5.5V supply voltage and 0°C to +70°C operating temperature limits before integration.

Selection Notes

Select this component when true data output is required, as opposed to the inverted output of the DM74ALS258. It serves as a direct replacement for standard Schottky and Low Power Schottky TTL devices where improved AC performance is desired. Verify that the 16-Lead SOP package fits the target PCB layout constraints.

Part Context

This part belongs to the DM74ALS series of logic ICs, specifically designed for high-speed digital applications requiring low power consumption relative to standard Schottky logic. The ALS technology provides faster switching speeds while maintaining lower power dissipation compared to earlier generations of TTL logic families.

Replacement Considerations

SN74ALS257D