Texas Instruments SN74LVC2244ADWRG4

Overview

SN74LVC2244ADWRG4 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 channels (1A–1Y and 2A–2Y), 3.3-V logic compatibility, 5.5-V-tolerant inputs, and integrated 26-Ω output series resistors-enabling direct interface with legacy 5-V systems in industrial I/O expansion and microcontroller peripheral buffering.

For engineers reviewing the SN74LVC2244ADWRG4 datasheet, SN74LVC2244ADWRG4 pinout, SN74LVC2244ADWRG4 application, or SN74LVC2244ADWRG4 equivalent, key selection criteria include 3-state timing (t_pd = 5.5 ns @ 3.3 V), I_off support for live insertion, mixed-voltage translation capability, and SOIC-20 package compatibility with standard PCB footprints.

Technical Context

This device implements dual 4-bit noninverting buffers with independent output-enable controls (1OE and 2OE). Each channel operates with rail-to-rail input tolerance up to 5.5 V while powered from 1.65–3.6 V, enabling bidirectional voltage-level translation without external components. The 26-Ω on-die series termination eliminates need for discrete resistors and suppresses overshoot/undershoot per JEDEC-compliant drive strength.

Functional behavior follows a simple truth table: when OE is low, Y mirrors A; when OE is high, Y enters high-impedance state. I_off protection ensures no current flows between inputs/outputs when V_CC = 0 V, supporting partial-power-down and hot-swap applications in server backplanes and modular instrumentation.

Key Specifications

Pinout & Package

SN74LVC2244ADWRG4 uses a 20-pin SOIC (DW) package with 12.80 mm × 7.50 mm body size and standard 0.050″ lead pitch. Pin 1 is located at top-left corner with notch or dot marking; leads are gull-wing, NIPDAU-finished, and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244A and 74LVC2244PW, SN74LVC2244ADWRG4 provides integrated termination and SOIC-20 manufacturability-making it optimal for industrial control boards requiring proven reliability, easy hand-soldering, and minimal layout iteration.

Availability

SN74LVC2244ADWRG4 is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller peripheral buffering, and test equipment design requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SN74LVC2244ADWRG4 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 solutions, with decades of experience in logic IC design and industrial-grade reliability validation.

The SN74LVC2244A product line targets mixed-voltage interface challenges in industrial automation, communications infrastructure, and test systems-delivering robust 3-state buffering with built-in ESD protection and power-aware features like I_off.

FAQ

What is the maximum operating temperature range for SN74LVC2244ADWRG4?

The SN74LVC2244ADWRG4 is rated for operation from –40°C to +125°C ambient temperature, validated across its full recommended V_CC range (1.65 V to 3.6 V). This extended range supports deployment in harsh environments such as factory-floor controllers and outdoor telecom equipment where thermal cycling is common. All electrical characteristics-including t_pd, I_OL, and I_off-are guaranteed across this full range per TI's SCAS572L datasheet revision July 2014.

Does SN74LVC2244ADWRG4 support true 5-V to 3.3-V level translation?

Yes, SN74LVC2244ADWRG4 supports unidirectional 5-V to 3.3-V level translation via its 5.5-V-tolerant inputs. When powered at V_CC = 3.3 V, inputs accept 0–5.5 V signals and produce 0–3.3 V outputs. However, it does not perform bidirectional translation: outputs cannot drive 5-V logic levels. For bidirectional use, external pull-ups or dedicated translators like TXB0108 are required. The SN74LVC2244ADWRG4 is optimized for MCU-to-peripheral signal extension, not bus arbitration.

Can SN74LVC2244ADWRG4 be used with V_CC = 1.8 V?

Yes, SN74LVC2244ADWRG4 is fully specified down to V_CC = 1.65 V, including switching performance (t_pd = 10.9 ns max at 1.8 V) and DC parameters (V_IL = 0.65×V_CC, V_IH = 0.35×V_CC). At 1.8 V, it maintains 5.5-V input tolerance and I_off functionality, making it suitable for ultra-low-power sensor nodes powered by single-cell Li-ion or energy-harvesting sources. Output drive strength scales with V_CC, delivering ~4 mA I_OL at 1.8 V.

What is the purpose of the integrated 26-Ω series resistors in SN74LVC2244ADWRG4?

The integrated 26-Ω series resistors in SN74LVC2244ADWRG4 serve as source termination to damp signal reflections on transmission lines, reducing overshoot and undershoot without requiring external components. They are effective for trace lengths >2 inches at 3.3-V operation and eliminate layout-dependent impedance mismatches. These resistors do not affect logic thresholds or DC drive capability-they only shape edge rates. TI specifies typical V_OLP < 0.8 V and V_OHV > 2 V at 3.3 V, confirming their effectiveness in suppressing ground/power bounce.

How should unused inputs be handled on SN74LVC2244ADWRG4?

All unused inputs on SN74LVC2244ADWRG4 must be tied to either V_CC or GND to prevent floating states that cause increased ICC, noise coupling, or erratic output behavior. TI explicitly recommends this in Section 7.3 of the datasheet. For example, unused OE pins should be pulled high via 10-kΩ resistor to V_CC to ensure outputs remain disabled; unused A inputs may be tied to GND to minimize leakage current. Leaving any input unconnected violates recommended operating conditions and risks functional failure in production systems.