Texas Instruments SN74LV139ADGVR

Overview

SN74LV139ADGVR from Texas Instruments is a dual 2-line to 4-line decoder/demultiplexer operating from 2V to 5.5V, with 7.5ns max propagation delay at 5V, mixed-mode voltage interface support, and I_off partial-power-down capability. It serves as a high-speed address decoder in memory subsystems and data-routing logic for industrial controllers and FPGA I/O expansion.

For engineers reviewing the SN74LV139ADGVR datasheet, SN74LV139ADGVR pinout, SN74LV139ADGVR application, or SN74LV139ADGVR equivalent, key selection criteria include V_CC range compatibility (2–5.5V), t_pd ≤ 7.5ns at 5V, active-low enable architecture, I_off leakage < 5μA, and TVSOP-16 package footprint constraints.

Technical Context

The SN74LV139ADGVR integrates two independent 2-to-4 decoders sharing no internal signal paths, each with separate active-low enable (1G/2G) and address inputs (1A0/1A1, 2A0/2A1). Its positive-logic decoding function drives one of four outputs low per channel while holding others high, enabling direct connection to NAND-based memory enable lines.

Designed for high-speed memory decoding, it features fully buffered inputs (1 normalized load), supports cascading via enable chaining, and meets JESD17 latch-up >250mA. The I_off circuitry disables outputs during power-down to prevent backflow current, critical for hot-swap and multi-rail systems.

Key Specifications

Pinout & Package

SN74LV139ADGVR uses the TVSOP-16 (DGV) package: 3.6mm × 6.4mm body size, 0.5mm pitch, 16-pin surface-mount with exposed pad (no thermal pad connection required). Pin 1 marked by beveled corner; pins arranged in two rows, 8 per side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC139DR and 74LVC139APW, SN74LV139ADGVR uniquely balances 7.5ns speed, 2–5.5V flexibility, I_off safety, and industrial-grade ESD-making it optimal for mixed-voltage, hot-swap-capable embedded systems requiring guaranteed decode latency and rail isolation.

Availability

SN74LV139ADGVR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, FPGA I/O expansion modules, and high-speed memory subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LV139ADGVR 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LV139A family targets high-speed, low-voltage logic applications demanding robust mixed-signal interfacing, precise timing control, and reliable operation in harsh environments-especially memory decoding and data routing in resource-constrained embedded systems.

FAQ

What is the maximum propagation delay of the SN74LV139ADGVR at 3.3V operation?

The SN74LV139ADGVR has a maximum propagation delay of 7ns at V_CC = 3.3V with 15pF load, per TI's SCLS396J datasheet Section 4.7. This value reflects worst-case t_pd from address or enable input to any Y output transition, ensuring timing predictability in 3.3V FPGA and microcontroller interfaces. The SN74LV139ADGVR maintains consistent performance across its full operating temperature range.

Does the SN74LV139ADGVR support partial-power-down mode, and how is it implemented?

Yes, the SN74LV139ADGVR supports partial-power-down mode via its I_off circuitry, which disables all outputs when V_CC = 0V while limiting input/output leakage to <5μA across 0–5.5V. This prevents backflow current between powered and unpowered rails-a critical feature for hot-swap modules and battery-backed systems. The SN74LV139ADGVR achieves this without external components or configuration pins.

Can the SN74LV139ADGVR interface directly with 5V logic while operating at 3.3V V_CC?

Yes, the SN74LV139ADGVR supports mixed-mode voltage operation: its inputs tolerate up to 5.5V regardless of V_CC level, enabling direct connection to 5V address buses while powered from a 3.3V rail. This eliminates level shifters in hybrid-voltage systems. The SN74LV139ADGVR maintains valid output swing (0V to V_CC) and specified timing under these conditions.

What is the recommended bypass capacitor for the SN74LV139ADGVR, and where should it be placed?

Texas Instruments recommends a 0.1μF ceramic bypass capacitor placed as close as possible to the V_CC pin (pin 16) with a low-inductance path to GND (pin 8). For enhanced noise suppression, a parallel 1μF capacitor may be added. The SN74LV139ADGVR's TVSOP-16 package requires tight placement-within 2mm of the power pin-to minimize loop inductance and maintain signal integrity at high switching speeds.

How does the enable logic work on the SN74LV139ADGVR, and can it be used for demultiplexing?

The SN74LV139ADGVR features two independent active-low enables (1G, 2G): when asserted low, each enables its respective 2-to-4 decoder; when high, all four outputs go high-impedance. In demultiplexing mode, an enable pin serves as the data input-e.g., driving 1G with serial data while addressing Y0–Y3 with A0/A1. The SN74LV139ADGVR's architecture supports this natively without external gates or timing adjustments.