SN74HC139DRG4

Overview

The SN74HC139DRG4 is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments HC logic family. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -40°C to 85°C. The device features active-low outputs and includes two enable inputs to simplify cascading or data reception. It provides low power consumption with a maximum ICC of 80 μA and typical propagation delays of 10 ns at 5 V. The component is housed in a 16-pin SOIC package.

Feature Summary

• Incorporates two independent decoders with active-low outputs for high-speed memory decoding applications
• Features fully buffered inputs that represent only one normalized load to the driving circuit
• Includes active-low enable inputs that can function as data lines in demultiplexing scenarios

Applications

• High-performance memory systems requiring short propagation delay times
• Data-transmission systems utilizing fast enable circuits
• Cascaded decoding configurations

Procurement Notes

Verify the specific ordering suffix 'DRG4' corresponds to the SOIC-16 package, tape and reel carrier, and lead finish details provided in the manufacturer's orderable addendum. Confirm RoHS compliance status and moisture sensitivity level ratings prior to procurement to ensure compatibility with assembly processes.

Selection Notes

Select this component when designing systems requiring dual 2-to-4 decoding capabilities within the HC logic family. Ensure the application voltage falls between 2 V and 6 V. Consider the thermal resistance characteristics of the SOIC package if multiple devices are utilized on the same board layout.

Part Context

This part belongs to the SNx4HC139 series, which contains two individual 2-line to 4-line decoders in a single package. The series is designed for high-performance applications where minimizing system decoding effects is critical. Other variants in the family include different package options such as SSOP, PDIP, and TSSOP.

Replacement Considerations

SN74HC139DR

FAQ

Can the enable input be used as a data line?

Yes, the active-low enable (G) input can be utilized as a data line specifically for demultiplexing applications.

What is the behavior of the outputs when disabled?

When the outputs are not disabled by the strobe input, only the selected output is low while all others remain high.