Texas Instruments SN74LV244ATDGVRE4

Overview

SN74LV244ATDGVRE4 from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for memory-address, clock, and bus-oriented applications. It operates from 4.5 V to 5.5 V, features TTL-compatible inputs, Ioff partial-power-down support, and delivers typical propagation delay of 5.4 ns at 5 V. Used in industrial control backplanes and embedded data buses.

For engineers reviewing the SN74LV244ATDGVRE4 datasheet, SN74LV244ATDGVRE4 pinout, SN74LV244ATDGVRE4 application, or SN74LV244ATDGVRE4 equivalent, key selection criteria include 3-state output timing (tPLZ/tPHZ ≤ 12 ns), Ioff leakage (<5 µA), and TVSOP-20 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Each buffer section passes A-inputs to Y-outputs when its OE is low; outputs enter high-impedance state when OE is high. Input logic thresholds are fixed at VIH = 2 V and VIL = 0.8 V across 4.5–5.5 V supply range.

It supports mixed-mode voltage operation on all ports and includes robust noise immunity: VOLP < 0.8 V and VOHV > 2.3 V at VCC = 5 V. The Ioff circuitry actively disables outputs during power-down to prevent backflow current, meeting JESD 17 latch-up requirements (>250 mA).

Key Specifications

Pinout & Package

SN74LV244ATDGVRE4 uses a 20-pin Thin Very Small Outline Package (TVSOP) with 0.5-mm pitch, measuring 4.4 mm × 3.6 mm × 1.05 mm. This compact footprint supports high-density routing in space-constrained industrial and communications PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer applications.

Compared with SN74LV244ATDGVRE4, SN74LVC244APWR offers faster speed but sacrifices 5-V compatibility and Ioff protection, while 74ACT244SCX provides stronger drive and noise margin at the cost of higher quiescent current and no partial-power-down capability - making SN74LV244ATDGVRE4 optimal for mixed-voltage, power-aware industrial bus interfaces.

Availability

SN74LV244ATDGVRE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus interfaces, and test equipment signal routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LV244ATDGVRE4 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 for industrial, automotive, and communications markets.

The SN74LV244AT series belongs to TI's LV logic family, engineered for low-voltage 5-V operation with enhanced noise immunity and power-down safety - targeting high-reliability industrial control and instrumentation applications.

FAQ

What is the recommended power-up sequence for SN74LV244ATDGVRE4 to avoid bus contention?

TI specifies that OE pins must be held high (via pullup resistor to VCC) during power-up to ensure outputs remain in high-impedance state until system initialization completes. For SN74LV244ATDGVRE4, a 10-kΩ pullup per OE pin is sufficient given its Ioff leakage <5 µA; this prevents unintended driving before firmware configures bus direction.

Does SN74LV244ATDGVRE4 support hot-swap insertion into a live 5-V backplane?

Yes - SN74LV244ATDGVRE4 incorporates Ioff circuitry that disables outputs when VCC = 0 V, limiting backflow current to <5 µA even with live inputs. This meets JESD 78 Class II latch-up immunity and allows safe insertion into energized 5-V bus systems when OE is externally held high.

Can SN74LV244ATDGVRE4 interface directly between a 3.3-V FPGA and 5-V ADC without level shifters?

Yes - SN74LV244ATDGVRE4 accepts 3.3-V logic-high inputs (VIH = 2.0 V min) and drives 5-V-tolerant loads (VOL = 0.55 V max at 16 mA). Its mixed-mode operation allows the FPGA to drive A-inputs while Y-outputs swing rail-to-rail at 5 V, eliminating external level translators in this configuration.

What is the thermal resistance (θJA) of the TVSOP package used by SN74LV244ATDGVRE4?

The TVSOP-20 (DGV) package for SN74LV244ATDGVRE4 has a junction-to-ambient thermal resistance (θJA) of 92 °C/W under standard JEDEC PCB conditions. This value assumes a 1-in² copper pad with two internal layers; actual performance improves with enhanced heatsinking or reduced ambient temperature.

How does the noise performance of SN74LV244ATDGVRE4 compare to standard 74LS244 devices?

SN74LV244ATDGVRE4 significantly exceeds 74LS244 noise immunity: it specifies VOLP < 0.8 V and VOHV > 2.3 V at 5 V, versus typical 74LS244 values of ~1.2 V and ~1.8 V. This 40% lower ground bounce and 28% higher undershoot margin directly improve signal integrity in dense, high-speed bus layouts.