MC74ACT139DT

Overview

The MC74ACT139DT is a high-speed dual 1-of-4 decoder/demultiplexer manufactured by onsemi. It contains two independent decoders, each accepting two binary weighted address inputs (A0-A1) and providing four mutually exclusive active-LOW outputs (O0-O3). Each decoder features an active-LOW enable input that can function as a data input for demultiplexing applications. The device operates within a supply voltage range of 4.5 V to 5.5 V and utilizes TTL-compatible inputs.

Feature Summary

• Contains two completely independent 1-of-4 decoders with active-LOW mutually exclusive outputs.
• Features TTL-compatible inputs for direct interfacing with standard logic families.
• Capable of generating all four minterms of two variables for function generation.
• Outputs are capable of sourcing and sinking up to 24 mA.

Applications

• Address decoding in microprocessor-based systems
• Data distribution via demultiplexing operations
• Implementation of Boolean logic functions using minterm generation

Procurement Notes

Verify the specific ordering suffix 'DT' corresponds to the TSSOP-16 package configuration required for your design. Confirm RoHS compliance status through official manufacturer documentation or component marking. Ensure the selected variant matches the ACT series specifications for TTL input compatibility rather than the AC series.

Selection Notes

Select this component when a dual decoder solution is required within a single package to reduce board space. The ACT series ensures compatibility with TTL logic levels while maintaining CMOS performance characteristics. Verify that the operating temperature range of -40°C to +85°C meets the environmental requirements of the target application.

Part Context

This part belongs to the MC74AC/ACT139 family of dual 1-of-4 decoders. It shares functional similarities with the MC74AC139 but includes TTL-compatible inputs characteristic of the ACT series. The device is designed for general-purpose digital logic applications requiring efficient signal routing and decoding capabilities.

Replacement Considerations

MC74AC139DT serves as a compatible alternative if TTL input thresholds are not required. Other variants within the same datasheet include DIP-16 and SOIC-16 packages depending on mounting preferences.