Texas Instruments SN74ALVC244NSRE4

Overview

SN74ALVC244NSRE4 from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features two independent 4-bit channels, each with separate output-enable (OE) inputs, ±24-mA drive strength at 3.3 V, 2.8-ns max propagation delay, and ESD protection exceeding JESD 22 standards. It is used in bidirectional bus interfacing between microcontrollers and peripheral logic in industrial control modules.

For engineers reviewing the SN74ALVC244NSRE4 datasheet, SN74ALVC244NSRE4 pinout, SN74ALVC244NSRE4 application, or SN74ALVC244NSRE4 equivalent, key selection criteria include 3-state output timing behavior, dual-OE control architecture, voltage-level translation capability across 1.65–3.6 V, and SOP-20 package thermal performance (θ_JA = 60°C/W).

Technical Context

This device implements dual 4-bit noninverting buffers with independent 3-state control per group. Each channel passes data from A inputs to Y outputs when its OE is low; outputs enter high-impedance state when OE is high. The logic supports mixed-voltage system interfacing due to wide V_CC range and level-shifted input thresholds (e.g., V_IL = 0.35×V_CC at 1.65 V).

Internal design ensures robust noise immunity and latch-up immunity (>250 mA per JESD 17). Output drivers are optimized for fast edge rates (5 ns/V input transition limit) and low capacitive loading (C_i = 4.5 pF, C_o = 7.5 pF), enabling reliable operation in high-speed digital backplanes and FPGA I/O expansion interfaces.

Key Specifications

Pinout & Package

SOP-20 (NS) package: 12.8 mm × 7.5 mm body, 1.75 mm height, 0.65 mm lead pitch, gull-wing leads, JEDEC MO-153 compliant. Thermal resistance θ_JA = 60°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74AVC244TTR, SN74ALVC244NSRE4 delivers consistent ±24-mA drive across its full 1.65–3.6-V range and retains pin compatibility with legacy ALVC designs, making it optimal for industrial upgrades where reliability and layout reuse are prioritized over marginal speed gains.

Availability

SN74ALVC244NSRE4 is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, FPGA I/O expansion modules, and microcontroller peripheral multiplexing requiring stable component supply and long-term manufacturability.

Supply support for SN74ALVC244NSRE4 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 connectivity technologies, with decades of experience in industrial-grade logic and interface solutions.

The SN74ALVC244NSRE4 belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in harsh industrial and automotive environments.

FAQ

What is the recommended power-up sequence for SN74ALVC244NSRE4?

TI recommends tying both 1OE and 2OE to V_CC through pullup resistors (minimum value determined by driver sink capability) before applying V_CC. This ensures outputs remain in high-impedance state during power ramp-up. For SN74ALVC244NSRE4, a 10-kΩ resistor suffices given its ±5-µA input leakage. Failure to do so may cause bus contention or undefined logic states during startup.

Does SN74ALVC244NSRE4 support true bidirectional data flow?

No - SN74ALVC244NSRE4 is a unidirectional buffer: data flows only from A inputs to Y outputs. Bidirectional operation requires external control logic and separate direction signals. The device does not contain internal direction control or bus transceivers; it functions strictly as a 3-state noninverting driver with two independent enable inputs.

Can SN74ALVC244NSRE4 operate reliably at 1.65 V with full timing specifications?

Yes - SN74ALVC244NSRE4 is fully characterized down to 1.65 V. At this voltage, t_pd increases to 4.4 ns (vs. 2.8 ns at 3.3 V), I_OH/I_OL reduce to ±4 mA, and input thresholds scale proportionally (V_IL = 0.58 V, V_IH = 1.07 V). All AC/DC specs in the datasheet apply across the full 1.65–3.6-V range.

What is the thermal performance of SN74ALVC244NSRE4 in SOP-20 package?

The SN74ALVC244NSRE4 in NS package has a junction-to-ambient thermal resistance (θ_JA) of 60°C/W under standard JEDEC test conditions (single-layer 1-oz copper, 1-in² pad). With proper PCB layout - including thermal vias under exposed pad (if present) and ≥2 cm² copper pour - actual θ_JA can improve to ~45°C/W, supporting continuous operation at ambient temperatures up to 85°C with typical load conditions.

Is SN74ALVC244NSRE4 RoHS-compliant and lead-free?

Yes - SN74ALVC244NSRE4 is RoHS-compliant and features NiPdAu (NIPDAU) lead finish. It carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for peak reflow temperatures up to 260°C per JEDEC J-STD-020. The "E4" suffix denotes TI's green packaging standard, confirming halogen-free and lead-free compliance.