Texas Instruments SN74LVC2244ADBQR

Overview

SN74LVC2244ADBQR 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), dual output-enable inputs (1OE, 2OE), 5.5 ns max propagation delay at 3.3 V, and 26-Ω integrated output series resistors-enabling direct interface with high-speed digital buses in mixed-voltage systems.

For engineers reviewing the SN74LVC2244ADBQR datasheet, SN74LVC2244ADBQR pinout, SN74LVC2244ADBQR application, or SN74LVC2244ADBQR equivalent, key selection criteria include its I_off support for live insertion, 5.5-V-tolerant inputs enabling 3.3-V/5-V translation, ±12 mA output drive capability, and SSOP-20 package compatibility with space-constrained industrial control and test equipment designs.

Technical Context

This device implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable control (1OE, 2OE). When OE is low, data passes from A inputs to Y outputs; when high, outputs enter high-impedance state. The architecture supports partial-power-down via I_off, preventing back-drive current when V_CC = 0 V.

All inputs tolerate up to 5.5 V regardless of V_CC level (1.65–3.6 V), enabling robust level translation. Outputs feature on-die 26-Ω series termination to suppress overshoot/undershoot-eliminating need for external resistors in point-to-point or lightly loaded bus applications.

Key Specifications

Pinout & Package

SN74LVC2244ADBQR is housed in a 20-pin SSOP (DBQ) package measuring 7.20 mm × 5.30 mm, with 0.65 mm lead pitch and gull-wing leads suitable for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2244ADBQR, SN74LVC244APWR offers better thermal performance in a marginally smaller footprint, while 74LVC244ADBR provides identical thermal behavior in a mechanically distinct SSOP variant-both retain full functional and timing equivalence for drop-in replacement in existing layouts.

Availability

SN74LVC2244ADBQR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automated test equipment signal conditioning, and mixed-voltage server backplane interface requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74LVC2244ADBQR 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 and embedded processing technologies, with over 90 years of innovation in precision analog, power management, and logic ICs.

The SN74LVC2244A family delivers high-speed, low-voltage octal buffering for industrial automation, communications infrastructure, and test instrumentation-designed to simplify mixed-voltage interface design while ensuring robust signal integrity and power sequencing resilience.

FAQ

What is the maximum operating temperature range for SN74LVC2244ADBQR?

The SN74LVC2244ADBQR is rated for operation from –40°C to +85°C ambient temperature. This range is validated per JEDEC JESD47 and supported by thermal characterization data showing R_θJA = 94.7°C/W for the DBQ package. Operation outside this range may result in parametric degradation or reliability risk, and is not guaranteed by Texas Instruments specifications.

Does SN74LVC2244ADBQR support 5-V input signals while powered at 3.3 V?

Yes, SN74LVC2244ADBQR supports input voltages up to 5.5 V regardless of V_CC level (1.65–3.6 V). This is explicitly specified in the Recommended Operating Conditions table and enabled by overvoltage-tolerant input structures. No external clamping or level-shifting circuitry is required when interfacing with 5-V logic sources.

Can SN74LVC2244ADBQR be used in hot-swap applications?

Yes, SN74LVC2244ADBQR supports hot-swap operation via its I_off feature, which limits input/output leakage to ±10 μA when V_CC = 0 V. This prevents damaging back-current flow during insertion into a live backplane or partial-power-down scenarios, satisfying JESD78 latch-up immunity (>250 mA) and JEDEC JESD22-A114 ESD requirements.

What is the purpose of the 26-Ω series resistor integrated into each output of SN74LVC2244ADBQR?

The 26-Ω on-die series resistor in SN74LVC2244ADBQR reduces output overshoot and undershoot by damping transmission-line reflections-especially beneficial in point-to-point or lightly loaded bus configurations. It eliminates the need for eight external 26-Ω resistors, saving PCB area and assembly cost while maintaining signal integrity at 5.5 ns propagation delay.

Is SN74LVC2244ADBQR pin-compatible with other members of the SN74LVC2244A family?

Yes, SN74LVC2244ADBQR shares identical pinout and logic functionality with all SN74LVC2244A variants-including SN74LVC2244ADBR (SSOP-DB), SN74LVC2244ADGVR (TVSOP), and SN74LVC2244APWR (TSSOP)-as confirmed by TI's Pin Configuration and Functions table and mechanical drawings. Only package dimensions and thermal metrics differ between variants.