Texas Instruments SN74LV244ADGSR

Overview

SN74LV244ADGSR from Texas Instruments is an octal 3-state buffer/driver IC designed for bidirectional signal buffering in bus-oriented systems. It features dual 4-bit groups with independent output-enable (OE) controls, operates from 2 V to 5.5 V, delivers ≤6.5 ns propagation delay at 5 V, supports mixed-mode voltage interfacing, and includes Ioff partial-power-down protection. It is used in server memory address buffering and telecom backplane signal conditioning.

For engineers reviewing the SN74LV244ADGSR datasheet, SN74LV244ADGSR pinout, SN74LV244ADGSR application, or SN74LV244ADGSR equivalent, this page provides verified functional identity, validated 20-pin TSSOP package mapping, confirmed 3-state drive capability (±16 mA), real-world noise immunity metrics (VOLP < 0.8 V, VOHV > 2.3 V @ 3.3 V), and two rigorously validated alternative parts for bus driver selection.

Technical Context

The SN74LV244ADGSR implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable (OE) control. Its balanced CMOS 3-state outputs support simultaneous sourcing and sinking up to ±16 mA per channel at 3.3 V, enabling robust driving of capacitive loads ≤50 pF.

It integrates Ioff circuitry that disables all outputs when VCC = 0 V, limiting input/output leakage to ≤5 µA, and features standard CMOS inputs with ≤2.3 pF capacitance and rail-to-rail VIH/VIL thresholds defined across 2–5.5 V supply range - enabling reliable interfacing between 2.5 V, 3.3 V, and 5 V logic domains.

Key Specifications

Pinout & Package

SN74LV244ADGSR is packaged in a 20-pin TSSOP (PW package), measuring 6.50 mm × 7.8 mm, with exposed pad optional for thermal enhancement. Pin numbering follows standard top-view orientation with GND (Pin 10) and VCC (Pin 20) centrally located for optimal decoupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74LV244ADGSR, SN74LVC244APWR offers broader low-voltage compatibility but sacrifices 0.6 ns timing margin and noise immunity; 74LVX244M trades drive strength, ground-bounce performance, and Ioff for legacy SOIC fit - making SN74LV244ADGSR the optimal choice for new 3.3 V/5 V hybrid systems demanding reliability and density.

Availability

SN74LV244ADGSR is available at Aetrix Electronics and suitable for server motherboard design, telecom infrastructure upgrades, and industrial motor-drive control systems requiring stable component supply, long lifecycle assurance, and consistent parametric performance across production batches.

Supply support for SN74LV244ADGSR 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, with decades of expertise in high-reliability industrial and communications ICs.

The SN74LV244A belongs to TI's LV logic family, engineered specifically to improve performance and board density in 3-state memory address drivers, clock distribution networks, and bus-oriented receivers/transmitters for enterprise and infrastructure equipment.

FAQ

What is the maximum propagation delay of SN74LV244ADGSR at 3.3 V?

The maximum propagation delay (tpd) of SN74LV244ADGSR is 13.5 ns at VCC = 3.3 V, CL = 50 pF, and over the full –40°C to +125°C operating temperature range. This value is measured from input transition to valid output transition under worst-case load and temperature conditions, ensuring timing margin for synchronous bus applications.

Does SN74LV244ADGSR support partial power-down mode?

Yes, SN74LV244ADGSR supports partial power-down mode via its Ioff feature. When VCC = 0 V, all inputs and outputs are disabled, limiting leakage current to ≤5 µA regardless of input voltage. This prevents current backflow and signal corruption during hot-swap events in modular telecom or server systems.

What is the recommended bypass capacitor for SN74LV244ADGSR?

Texas Instruments recommends a 0.1-μF ceramic capacitor placed as close as possible between VCC (Pin 20) and GND (Pin 10) for SN74LV244ADGSR. This minimizes high-frequency supply impedance, suppresses switching noise, and ensures stable 3-state transitions - especially critical when driving multiple loads simultaneously.

Can SN74LV244ADGSR drive LEDs directly?

Yes, SN74LV244ADGSR can drive LEDs directly with up to 16 mA per output at VCC ≥ 4.5 V. Its VOL ≤ 0.55 V at 16 mA ensures sufficient forward voltage headroom for standard red/green LEDs (VF ≈ 1.8–2.2 V) when supplied from 5 V, eliminating need for external current-limiting transistors in indicator applications.

What is the function of the two OE pins on SN74LV244ADGSR?

SN74LV244ADGSR has two independent active-low output-enable pins: 1OE (Pin 1) controls Group 1 outputs (1Y1–1Y4), and 2OE (Pin 19) controls Group 2 outputs (2Y1–2Y4). Driving either OE high places its associated four outputs in high-impedance state, enabling flexible bus sharing and dynamic channel isolation without external logic.