DM74ALS138SJ

Overview

The DM74ALS138SJ is a 3-to-8 line decoder/demultiplexer manufactured by onsemi, utilizing an Advanced Schottky TTL process. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a free air operating temperature from 0 °C to +70 °C. The device features three binary select inputs (A, B, C) and three enable inputs (G1, G2A, G2B). Propagation delays are specified with maximums of 8 ns for data paths and 7 ns for enable paths at 50 pF load.

Feature Summary

• Incorporates three enable inputs to simplify cascading and data reception without external inverters.
• Features fully buffered inputs presenting only one normalized load to the driving circuit.
• Inputs are clamped with high-performance Schottky diodes to suppress line-ringing.

Applications

• High-performance memory decoding systems
• Data routing applications requiring short propagation delay times
• Data transmission systems

Procurement Notes

Verify component authenticity through authorized channels as this part may be obsolete or subject to lifecycle changes. Confirm package specifications match the M16D designation for the 16-Lead Small Outline Package. Review datasheet electrical characteristics against current system requirements before integration.

Selection Notes

Select this component when low power dissipation and high-speed performance are required for memory decoding. The ALS logic family offers faster switching than standard TTL while maintaining lower power consumption. Ensure the application environment stays within the 0 °C to +70 °C operating temperature range.

Part Context

This device belongs to the 74ALS logic family, known for advanced oxide-isolated, ion-implanted Schottky technology. It serves as a direct functional replacement for older 74S138 variants in legacy designs, offering improved speed and reduced power usage while maintaining compatible pinouts and logic functions.

Replacement Considerations

Check for equivalent parts such as DM74ALS138M or DM74ALS138N if package variations are acceptable. Verify that substitute components maintain the same M16D SOP package dimensions and electrical specifications for seamless integration.