Texas Instruments SN74LVC2244ADWR

Overview

SN74LVC2244ADWR from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for 1.65 V to 3.6 V V_CC operation. It features two independent 4-bit sections (1A–1Y and 2A–2Y), dual output-enable inputs (1OE, 2OE), 5.5 ns max propagation delay at 3.3 V, and 26-Ω integrated series output resistors-enabling direct interface with high-speed digital buses in industrial control backplanes.

For engineers reviewing the SN74LVC2244ADWR datasheet, SN74LVC2244ADWR pinout, SN74LVC2244ADWR application, or SN74LVC2244ADWR equivalent, key selection criteria include its 3.6 V max supply rating, 5.5 V-tolerant inputs, I_off support for live insertion, ±12 mA output drive per channel, and SOIC-20 package compatibility with legacy 3.3 V/5 V mixed-signal system interconnects.

Technical Context

The SN74LVC2244ADWR implements dual 4-bit noninverting buffers with independent 3-state control: each OE input enables/disables its associated four Y outputs while preserving input integrity. Its CMOS design supports down-translation-accepting 5.5 V inputs with 3.3 V V_CC-and includes I_off circuitry that disables all outputs when V_CC = 0 V, preventing back-drive current during partial power-down.

Output stages integrate 26-Ω series resistors to suppress overshoot/undershoot without external components; typical VOLP is <0.8 V and VOHV >2 V at V_CC = 3.3 V. The device meets JESD 22 ESD standards (2000-V HBM, 1000-V CDM) and exceeds 250 mA latch-up immunity per JESD 17.

Key Specifications

Pinout & Package

SN74LVC2244ADWR is supplied in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 0.65 mm lead pitch and RoHS-compliant NiPdAu finish. The package supports automated placement and reflow soldering per Level-1 MSL rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244A and 74ALVC244, SN74LVC2244ADWR uniquely combines 5.5 V input tolerance, I_off protection, and full –40°C to +125°C operation-making it the only option qualified for ruggedized industrial and automotive hot-swap interfaces without external protection circuitry.

Availability

SN74LVC2244ADWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, automotive body control modules, and network equipment line cards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC2244ADWR 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 SN74LVC2244ADWR belongs to TI's LVC logic family-designed specifically for low-voltage, high-speed, mixed-signal system interfacing with robust ESD performance and wide supply voltage flexibility.

FAQ

What is the maximum input voltage rating for SN74LVC2244ADWR?

The SN74LVC2244ADWR accepts input voltages up to 5.5 V regardless of V_CC level, enabling direct interfacing with 5 V logic families while operating from 1.65 V to 3.6 V supplies. This overvoltage tolerance is specified across the full operating temperature range and does not require external clamping diodes. The absolute maximum input rating remains –0.5 V to 6.5 V, but functional operation is guaranteed only up to 5.5 V per the Recommended Operating Conditions table in the SN74LVC2244ADWR datasheet.

Does SN74LVC2244ADWR support hot-swap applications?

Yes, SN74LVC2244ADWR supports hot-swap applications via its I_off feature, which disables all outputs and limits leakage current to ±10 μA when V_CC = 0 V. This prevents back-driving powered circuitry during card insertion/removal in modular systems like industrial PLC racks or telecom line cards. To ensure reliable high-impedance behavior during power transitions, OE pins should be pulled up to V_CC through a resistor sized per the driver's sink capability-typically 10 kΩ for most microcontroller outputs.

What is the purpose of the 26-Ω series resistors in SN74LVC2244ADWR outputs?

The 26-Ω series resistors integrated into each SN74LVC2244ADWR output stage dampen signal reflections and reduce overshoot/undershoot on transmission lines, eliminating the need for external series termination components. These resistors are optimized for use with standard PCB trace impedances (e.g., 50 Ω) and contribute to the device's typical VOLP < 0.8 V and VOHV > 2 V at V_CC = 3.3 V. They do not affect DC logic thresholds but improve signal integrity in point-to-point or short-bus configurations up to ~100 MHz.

Can SN74LVC2244ADWR drive standard TTL loads?

Yes, SN74LVC2244ADWR can drive standard TTL loads with its ±12 mA output current capability per channel at V_CC = 3.3 V. At this supply voltage, it delivers VOH ≥ 2.4 V and VOL ≤ 0.55 V under 8 mA load conditions-exceeding TTL VIH (2.0 V) and VIL (0.8 V) thresholds. The device maintains compatible noise margins even when interfacing with legacy 5 V TTL devices due to its 5.5 V input tolerance and robust output drive strength, making SN74LVC2244ADWR suitable for upgrading aging 5 V systems with modern low-voltage controllers.

What package type is used for SN74LVC2244ADWR?

SN74LVC2244ADWR uses a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with 0.65 mm lead pitch. It is RoHS-compliant with NiPdAu lead finish and rated for Level-1 MSL (unlimited floor life). This package supports standard surface-mount assembly processes and is pin-compatible with other SOIC-20 logic devices, facilitating drop-in replacement in existing designs. The DW package variant is distinct from SSOP (DBQ/DB), TVSOP (DGV), and TSSOP (PW) versions of the same part number.