MC74AC139NG

Overview

The MC74AC139NG is a dual 1-of-4 decoder/demultiplexer from the 74AC logic family, manufactured by onsemi. It features two independent decoders, each with two binary weighted address inputs (A0, A1) and four mutually exclusive active-LOW outputs (O0-O3). Each decoder includes an active-LOW enable input that can function as a data input for demultiplexing applications. The device operates within a supply voltage range of 2.0 V to 6.0 V and supports output currents of 24 mA. It is housed in a 16-lead PDIP package.

Feature Summary

• Dual independent 1-of-4 decoder functionality
• Active-LOW mutually exclusive outputs
• Enable inputs support demultiplexer operations
• High-speed AC logic performance

Applications

• Address decoding in memory systems
• Data distribution via demultiplexing
• Function generation using minterms
• Replacing multiple discrete gate functions

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the PDIP-16 package configuration. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure the procurement channel provides valid traceability for semiconductor components. Cross-reference the full part number against current datasheet revisions to confirm pinout and electrical specifications match design requirements.

Selection Notes

Select this component when dual independent decoding or demultiplexing is required within a single package. The AC series offers higher speed compared to standard HC or HCT families while maintaining CMOS power efficiency. Verify that the system operating voltage falls within the 2.0 V to 6.0 V range. Consider the PDIP-16 package constraints if PCB space allows for through-hole mounting rather than surface-mount alternatives.

Part Context

This device belongs to the MC74AC/74ACT logic family, designed for high-speed digital applications. The 74AC series utilizes advanced silicon gate technology to achieve faster switching speeds than previous generations. The dual decoder architecture allows for efficient implementation of complex logic networks by consolidating multiple functions into a single integrated circuit.

Replacement Considerations

MC74AC139D

FAQ

Can the Enable input be used as a data input?

Yes, the active-LOW Enable input can function as the data input for a 4-output demultiplexer application.

What is the output state when the Enable input is HIGH?

When the Enable input is HIGH, all four outputs are forced to the HIGH state.