DM74ALS138SJX

Overview

The DM74ALS138SJX is a 3-to-8 line decoder and 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 maximum values of 8 ns for data paths and 7 ns for enable paths at 50 pF load.

Feature Summary

• Incorporates fully buffered inputs clamped with high-performance Schottky diodes to suppress line-ringing.
• Features three enable inputs to simplify cascading and data reception without external inverters.
• Designed for high-speed applications requiring very short propagation delay times.

Applications

• High-performance memory decoding systems
• Data routing and transmission systems
• Demultiplexing applications using enable inputs as data lines

Procurement Notes

Verify the specific ordering suffix 'SJX' against current manufacturer documentation to confirm package type and tape-and-reel availability. Confirm RoHS compliance status and lifecycle stage directly with the supplier or manufacturer before procurement planning.

Selection Notes

Select this component when low power dissipation and high speed are required in memory decoding or data routing. Ensure the application environment stays within the 0°C to +70°C operating temperature range and utilizes a 5V nominal supply voltage for optimal performance.

Part Context

This part belongs to the 74ALS logic family, characterized by advanced oxide-isolated, ion-implanted Schottky technology. It serves as a direct functional replacement for standard 74LS138 devices but offers improved switching speeds and lower power consumption suitable for high-performance digital circuits.

Replacement Considerations

Direct pin-compatible alternatives include the DM74ALS138M (SOIC) and DM74ALS138N (PDIP). Verify that substitute packages match the physical footprint requirements of the existing design.

FAQ

How many enable inputs does the DM74ALS138SJX have?

The device incorporates three enable inputs: one active-HIGH (G1) and two active-LOW (G2A and G2B).

What is the typical power dissipation of this decoder?

The typical power dissipation is 23 mW under recommended operating conditions.