DM74ALS157SJX

Overview

The DM74ALS157SJX is a quad 1-of-2 line data selector/multiplexer manufactured by onsemi. It utilizes an advanced oxide-isolated, ion-implanted Schottky TTL process and operates within a supply voltage range of 4.5 V to 5.5 V. The device features four independent multiplexing circuits with true outputs, routing a 4-bit word from one of two sources based on a select input. It includes a separate strobe input for enabling or disabling the outputs. The component is housed in a 16-Lead Small Outline Package (SOP) with EIAJ TYPE II dimensions.

Feature Summary

• Functionally and pin-for-pin compatible with Schottky and low power Schottky TTL counterparts
• Improved AC performance over standard Schottky and low power Schottky devices
• Switching specifications guaranteed over the full temperature and supply voltage range

Applications

• Multiplexing dual data buses
• Source programmable counters
• Implementing general four functions of two variables where one variable is common

Procurement Notes

Verify that the ordering code suffix 'X' corresponds to tape and reel packaging as specified in the datasheet. Confirm the package type matches the 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide designation. Ensure compatibility with existing Schottky TTL designs if replacing legacy components.

Selection Notes

Select this component when true data output is required, distinguishing it from the inverted-output DM74ALS158. Consider its improved AC performance and compatibility with Schottky TTL standards for systems requiring faster switching speeds than low-power variants while maintaining similar power consumption profiles.

Part Context

This part belongs to the DM74ALS157/158 series of Quad 1-of-2 Line Data Selectors/Multiplexers. The ALS family represents Advanced Low-power Schottky technology, offering a balance between speed and power dissipation. The specific model indicates the SOP package variant with tape and reel delivery format.

Replacement Considerations

Direct functional substitutes include other DM74ALS157 variants in different packages, such as the SOIC (DM74ALS157M) or PDIP (DM74ALS157N). Cross-manufacturer equivalents following the 74ALS157 specification are also viable options.