DM74AS257SJ

Overview

The DM74AS257SJ is a high-speed Schottky quad 2-input multiplexer manufactured by onsemi. It features four independent 2-to-1 data selectors in a single package, utilizing the 74AS logic series for superior speed and power dissipation characteristics. The device operates within a supply voltage range of 4.5V to 5.5V and supports clock frequencies up to 80 MHz. It is housed in a 16-SOP surface-mount package with a width of 5.30mm. Key electrical parameters include a maximum propagation delay of 10ns at 5V with 50pF load, output currents of 1mA (high) and 20mA (low), and a static current of 45 mA. The component is designed for operation between 0°C and 70°C.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels for efficient signal routing
• Utilizes high-speed Schottky technology for rapid switching performance
• Features non-inverting outputs for direct signal transmission
• Supports standard TTL-compatible logic levels

Applications

• Data acquisition systems requiring multi-channel signal selection
• Digital communication interfaces for line driver control
• Microprocessor-based systems for address/data bus multiplexing
• Test and measurement equipment for signal path configuration

Procurement Notes

Verify the exact suffix 'SJ' against official onsemi documentation to confirm package dimensions and tape/reel specifications. Confirm end-of-life status as this part may be discontinued. Ensure compatibility with existing PCB footprints for 16-SOP packages. Check for RoHS compliance if required by your manufacturing standards. Validate that the 74AS series speed matches your system timing requirements before procurement.

Selection Notes

Select this component when high-speed multiplexing is required in space-constrained designs. The 74AS series offers faster switching than standard 74LS devices but consumes more power. Consider thermal management due to higher power dissipation compared to low-power variants. Ensure the 5V supply voltage aligns with your system architecture. Evaluate the 16-SOP package availability against your assembly capabilities.

Part Context

This device belongs to the 74AS (Advanced Schottky) family, known for balancing speed and power consumption. It serves as a digital switch solution within the broader 74xx logic ecosystem. The DM prefix typically denotes specific manufacturer variations or packaging styles within the onsemi portfolio. It complements other 74AS logic gates and flip-flops in complex digital circuits.

Replacement Considerations

Public confirmed substitute part numbers: None identified in provided documentation.