DM74LS139N

Overview

The DM74LS139N is a dual 2-line-to-4-line decoder/demultiplexer manufactured by onsemi in a 16-pin PDIP package. It operates within a supply voltage range of 4.75V to 5.25V and supports an operating temperature range of 0°C to +70°C. The device features active-low outputs and inputs clamped with Schottky diodes to suppress line-ringing. Typical propagation delay is 21 ns, with maximum delays reaching 40 ns under specified load conditions.

Feature Summary

• Contains two fully independent 2-to-4-line decoders or demultiplexers within a single package
• Features Schottky clamping on all inputs to suppress line-ringing and simplify system design
• Provides fully buffered inputs presenting only one normalized load to the driving circuit
• Includes active-low enable inputs that can function as data lines for demultiplexing applications

Applications

• High-performance memory decoding systems
• Data routing and transmission systems
• Cascading logic expansion requiring minimal external gates

Procurement Notes

Verify component authenticity through authorized distributors due to historical manufacturing transitions from Fairchild Semiconductor to onsemi. Confirm package integrity and pin alignment against the N16E specification. Ensure environmental compliance documentation matches current regulatory requirements for electronic components.

Selection Notes

Select this component when designing circuits requiring dual independent decoding channels within a standard DIP footprint. Consider its specific voltage thresholds and output drive capabilities relative to connected loads. Evaluate thermal performance within the specified industrial temperature range during system integration.

Part Context

This part belongs to the 74LS series of logic integrated circuits, characterized by Schottky technology for improved switching speeds compared to standard LS devices. It serves as a complementary counterpart to the DM74LS138 decoder within the same datasheet family, offering distinct functional configurations for varied digital logic architectures.

Replacement Considerations

Compatible substitutes include the DM74LS139M (SOIC) and DM74LS139SJ (SOP) variants from the same manufacturer, which maintain identical electrical characteristics while differing only in physical package dimensions.