Texas Instruments 74ACT11139DRE4

Overview

74ACT11139DRE4 from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer IC designed for high-speed memory decoding and data routing. It features two independent decoders, TTL-compatible inputs, fully buffered inputs (1 normalized load each), 5-V operation, and propagation delays as low as 1.7 ns (tPLH) at 25°C - enabling use in fast address decoding for SRAM, ROM, and FPGA configuration interfaces.

For engineers reviewing the 74ACT11139DRE4 datasheet, 74ACT11139DRE4 pinout, 74ACT11139DRE4 application, or 74ACT11139DRE4 equivalent, key selection criteria include enable-controlled demux capability, ±24 mA output drive, latch-up immunity (500 mA at 125°C), EPIC™ CMOS process performance, and SOIC-16 package compatibility with legacy 74-series logic layouts.

Technical Context

This device implements two synchronous, active-low enabled 2-to-4 decoders in one IC. Each decoder accepts two address inputs (A, B) and one active-low enable (1G or 2G), producing four active-low outputs (Y0–Y3). Enables double as data lines in demultiplexing mode, supporting 1-of-4 data distribution per channel.

Designed using Texas Instruments' EPIC™ 1-µm CMOS process, it delivers TTL-voltage compatibility while maintaining CMOS power efficiency. Center-pin VCC/GND placement minimizes switching noise, and inputs tolerate −0.5 V to VCC + 0.5 V - critical for mixed-signal board interfacing and hot-swap tolerant designs.

Key Specifications

Pinout & Package

74ACT11139DRE4 is housed in a 16-pin plastic small-outline integrated circuit (SOIC) package (Package Drawing D), with standard 1.27 mm pitch and 10.3 mm × 5.3 mm body dimensions. Pin 1 is located at top-left corner (quadrant Q1) with notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.

Compared with 74ACT11139DRE4, 74ACT139D offers identical functionality with marginally relaxed timing, while SN74LV139AD trades speed and 5-V optimization for broader voltage flexibility - making the original part optimal for legacy 5-V, high-speed decode where timing margin is constrained.

Availability

74ACT11139DRE4 is available at Aetrix Electronics and suitable for industrial control panels, legacy memory subsystems, and FPGA configuration interfaces requiring stable component supply despite its obsolete status.

Supply support for 74ACT11139DRE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74ACT11139DRE4 belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, TTL-compatible digital interfacing in memory and data-path applications where propagation delay and noise immunity are critical.

FAQ

What is the operating voltage range for the 74ACT11139DRE4?

The 74ACT11139DRE4 operates strictly within 4.5 V to 5.5 V. Its design assumes a nominal 5-V supply, and it does not support 3.3-V or mixed-voltage operation. The absolute maximum rating extends to 7 V, but functional operation outside the recommended range may cause timing violations or increased power dissipation. Always verify VCC stability within this window when deploying the 74ACT11139DRE4 in production systems.

Is the 74ACT11139DRE4 pin-compatible with the 74LS139?

Yes, the 74ACT11139DRE4 is pin-compatible with the 74LS139 in SOIC-16 (D) package, sharing identical pin assignments for inputs, outputs, VCC, and GND. However, the 74ACT11139DRE4 delivers significantly faster propagation (1.7 ns vs. 25 ns), higher output drive (±24 mA vs. ±8 mA), and improved noise immunity due to its EPIC™ CMOS process - making it a direct upgrade where timing and drive strength matter.

Does the 74ACT11139DRE4 support demultiplexing functionality?

Yes, the 74ACT11139DRE4 supports demultiplexing via its dual active-low enable inputs (1G and 2G), which can serve as data-select lines. When used in demux mode, a single data bit applied to 1G controls whether the 1A/1B address pair routes to 1Y0–1Y3 outputs - enabling 1-bit-to-4-channel distribution per decoder section without external logic.

What is the meaning of "EPIC™" in the 74ACT11139DRE4 datasheet?

EPIC™ (Enhanced-Performance Implanted CMOS) is Texas Instruments' proprietary 1-µm CMOS fabrication process used for the 74ACT11139DRE4. It combines ion implantation for precise threshold control with optimized interconnects to achieve TTL-compatible input levels, sub-2 ns propagation delays, and 500 mA latch-up immunity at 125°C - distinguishing it from standard AC or ALS logic families.

Can unused inputs on the 74ACT11139DRE4 be left floating?

No, unused inputs on the 74ACT11139DRE4 must not be left floating. Per the datasheet's recommended operating conditions, all inputs - including enables and address lines - must be actively held HIGH or LOW using pull-up/pull-down resistors or driven by a known source. Floating inputs risk metastability, increased ICC, and unpredictable output states due to CMOS input sensitivity.