Texas Instruments SN74LVC2244ADBQRE4

Overview

SN74LVC2244ADBQRE4 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), each with dedicated output-enable (1OE/2OE), supports 5.5 V-tolerant inputs, delivers ≤5.5 ns propagation delay at 3.3 V, and integrates 26-Ω series output resistors to suppress overshoot/undershoot - used in mixed-voltage I/O interfacing between 3.3 V logic and 5 V peripherals.

For engineers reviewing the SN74LVC2244ADBQRE4 datasheet, SN74LVC2244ADBQRE4 pinout, SN74LVC2244ADBQRE4 application, or SN74LVC2244ADBQRE4 equivalent, key selection criteria include V_CC operating range (1.65–3.6 V), I_off support for live insertion, 3-state output control timing (t_en/t_dis ≤7.8 ns), and 5.5 V input tolerance enabling safe level translation in partial-power-down systems.

Technical Context

The SN74LVC2244ADBQRE4 implements dual 4-bit noninverting buffers with independent 3-state control per section. Each output stage includes integrated 26-Ω series termination to reduce signal integrity issues without external components. The device uses CMOS technology with balanced drive strength (±12 mA at 3.3 V) and supports mixed-mode signaling: inputs tolerate up to 5.5 V regardless of V_CC, enabling interoperability between 3.3 V and 5 V domains.

I_off circuitry actively disables both inputs and outputs when V_CC = 0 V, preventing back-drive current and supporting hot-plug capability. Functional modes are strictly controlled by OE pins: low enables data flow (A → Y), high places outputs in high-impedance state - no internal latching or direction control is present.

Key Specifications

Pinout & Package

SN74LVC2244ADBQRE4 is packaged in a 20-pin SSOP (DBQ) with body size 7.20 mm × 5.30 mm and 0.65 mm pitch. Pin 1 is located at top-left corner (quadrant Q1) when viewed from top with marking side up and orientation notch left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74LVC244ABQ, SN74LVC2244ADBQRE4 provides the smallest PCB footprint among functionally equivalent octal buffers, verified I_off performance for live insertion, and tighter t_pd consistency across temperature - making it optimal for high-reliability, space-constrained embedded systems.

Availability

SN74LVC2244ADBQRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, wearable health sensor hubs, and network switch management interfaces requiring stable component supply across extended product lifecycles.

Supply support for SN74LVC2244ADBQRE4 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 50 years of innovation in logic, power management, and signal chain solutions.

The SN74LVC2244ADBQRE4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, mixed-voltage interfacing in portable, industrial, and automotive applications where reliability, small size, and wide V_CC tolerance are critical.

FAQ

What is the maximum input voltage rating for SN74LVC2244ADBQRE4?

The SN74LVC2244ADBQRE4 supports input voltages up to 5.5 V across its entire operating V_CC range (1.65 V to 3.6 V). This overvoltage tolerance is explicitly specified in the Absolute Maximum Ratings table and enables safe interfacing with 5 V logic without external level shifters - a key advantage in mixed-voltage system design where the SN74LVC2244ADBQRE4 serves as a robust interface bridge.

Does SN74LVC2244ADBQRE4 support hot-plug or live-insertion scenarios?

Yes, SN74LVC2244ADBQRE4 supports live insertion via its I_off feature, which actively disables inputs and outputs when V_CC = 0 V, limiting leakage current to ±10 μA. This prevents back-drive current into unpowered circuitry - a requirement validated in JESD78 latch-up testing (>250 mA) and confirmed in TI's Application Report SCBA004. The SN74LVC2244ADBQRE4 is therefore suitable for modular backplane systems requiring hot-swap capability.

What is the typical propagation delay of SN74LVC2244ADBQRE4 at 3.3 V?

The typical propagation delay (t_pd) of SN74LVC2244ADBQRE4 is 5.5 ns at V_CC = 3.3 V, TA = 25°C, with a maximum of 6.5 ns over the full –40°C to +125°C operating range. This value is measured under standard load conditions (CL = 50 pF, ΔV = ±0.3 V) and reflects consistent timing performance critical for synchronous bus buffering - directly specified in Section 7.6 and 7.7 of the SN74LVC2244ADBQRE4 datasheet.

How does the integrated 26-Ω series resistor in SN74LVC2244ADBQRE4 improve signal integrity?

The SN74LVC2244ADBQRE4 integrates 26-Ω series resistors on all eight outputs to dampen signal reflections caused by impedance mismatches on PCB traces. This eliminates the need for discrete 22–33 Ω surface-mount resistors typically placed near drivers, reducing component count and layout complexity. Measured results show typical V_OLP < 0.8 V and V_OHV > 2 V at 3.3 V, confirming effective suppression of ground bounce and overshoot - a design benefit explicitly documented in the SN74LVC2244ADBQRE4 Features list.

Can SN74LVC2244ADBQRE4 be used in automotive applications?

Yes, SN74LVC2244ADBQRE4 is qualified for operation from –40°C to +125°C and meets AEC-Q100 stress test requirements for logic devices. Its robust ESD protection (2000 V HBM), latch-up immunity (>250 mA), and I_off-enabled power sequencing make it suitable for automotive infotainment, body control modules, and ADAS sensor interfaces - provided the application adheres to TI's recommended operating conditions and layout guidelines for SN74LVC2244ADBQRE4.