SN74HC139NE4

Overview

The SN74HC139NE4 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 fully buffered inputs, low power consumption with a maximum ICC of 80 μA, and typical propagation delays of 10 ns. Outputs can drive up to 10 LSTTL loads, providing ±4 mA output drive at 5 V.

Feature Summary

• Designed for high-speed memory decoders and data-transmission systems
• Incorporates two enable inputs to simplify cascading and data reception
• Features fully buffered inputs representing only one normalized load

Applications

• High-performance memory decoding
• Data-routing applications
• Demultiplexing circuits

Procurement Notes

Verify that the ordering suffix 'E4' indicates lead-free packaging compliant with RoHS standards. Confirm the package type is PDIP (N) with 16 pins. Ensure the active-low enable input configuration matches system requirements. Check for updated documentation revisions on the manufacturer website.

Selection Notes

Select this component when low power consumption and fast propagation delay are required in CMOS logic designs. The wide operating voltage range allows compatibility with various digital systems. Verify that the 2-to-4 line decoding function meets address bus or control signal routing needs without requiring additional gating logic.

Part Context

This part belongs to the SNx4HC139 series, which includes variants like SN74HC139N and SN74HC139D. The 'E4' suffix specifically denotes environmental compliance, typically indicating a lead-free finish. Other packages include SOIC, SSOP, and TSSOP options within the same functional family.

Replacement Considerations

SN74HC139N

FAQ

How does the enable input function in demultiplexing mode?

The active-low enable (G) input can be used as a data line. When the outputs are not disabled by the strobe input, only the selected output is low while all others are high.

What is the maximum output drive capability?

The outputs can drive up to 10 LSTTL loads, providing ±4 mA output drive at 5 V.