DM74ALS157MX

Overview

The DM74ALS157MX is a Quad 1-of-2 Line Data Selector/Multiplexer from the Advanced Low-power Schottky (ALS) TTL logic family, manufactured by onsemi. It features four independent data selectors in a single package, routing a 4-bit word from one of two sources to four outputs based on a common select input and strobe control. The device utilizes an advanced oxide-isolated, ion-implanted Schottky process for improved AC performance over standard Schottky counterparts. It operates within a supply voltage range of 4.5V to 5.5V and supports surface-mount installation in a 16-Lead Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Contains four independent 1-of-2 line data selectors with a common select input and separate strobe control.
• Utilizes advanced oxide-isolated, ion-implanted Schottky TTL process for enhanced switching speed.
• Functionally and pin-for-pin compatible with Schottky and low power Schottky TTL counterparts.
• Switching specifications are guaranteed over the full temperature and supply voltage range.

Applications

• Multiplexing dual data buses
• Expanding any data input point
• Implementing general four functions of two variables where one variable is common

Procurement Notes

Verify component authenticity through authorized channels as this part originates from legacy manufacturing lines. Confirm that the specific ordering suffix matches the required package type, as the 'X' suffix indicates tape and reel packaging. Ensure compatibility with existing system designs given its functional equivalence to older Schottky TTL standards.

Selection Notes

Select this component when high-speed data selection is required within the ALS logic family constraints. It serves as a direct replacement for standard Schottky multiplexers where pin compatibility is critical. Consider the specific output drive requirements and propagation delay characteristics relative to the system clock speeds before finalizing the design integration.

Part Context

This device belongs to the DM74ALS series, representing onsemi's implementation of Advanced Low-power Schottky logic. Originally developed by Fairchild Semiconductor, these components were designed to offer superior performance compared to standard LS and S series logic while maintaining backward compatibility. The DM74ALS157 specifically addresses applications requiring multiple parallel data paths to be selected simultaneously.

Replacement Considerations

SN74ALS157ANSR