Texas Instruments SN74LV244ATPWT

Overview

SN74LV244ATPWT from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for memory-address, clock, and bus-oriented applications. It operates from 4.5 V to 5.5 V, features TTL-voltage-compatible inputs, supports partial-power-down via Ioff, and delivers typical propagation delay of 5.4 ns at 5 V.

For engineers reviewing the SN74LV244ATPWT datasheet, SN74LV244ATPWT pinout, SN74LV244ATPWT application, or SN74LV244ATPWT equivalent, key selection criteria include 3-state output control timing (tPZH/tPLZ ≤ 8 ns), Ioff leakage (<5 µA), mixed-mode voltage support, and TVSOP-20 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control-1OE for Y1–Y4 and 2OE for Y5–Y8. Logic operation follows positive-enable convention: low OE enables data flow from A inputs to Y outputs; high OE forces all eight outputs into high-impedance state.

It integrates Ioff circuitry to disable outputs during power-down, preventing backflow current when VCC = 0 V while inputs remain active. Input thresholds are TTL-compatible (VIL = 0.8 V, VIH = 2 V), and output drive capability is ±16 mA at VCC = 4.5–5.5 V under recommended conditions.

Key Specifications

Pinout & Package

SN74LV244ATPWT uses a 20-pin Thin Very Small Outline Package (TVSOP) with 0.65 mm pitch, 4.4 mm × 6.5 mm body size, and 1.2 mm max height. The exposed pad variant is not used; thermal performance relies on standard PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV244ATPWT, SN74LVC244APWR offers superior speed in 3.3-V systems but sacrifices 5-V compatibility and Ioff protection, while 74ACT244SCX provides stronger drive and noise margin at 5 V but increases static power and removes partial-power-down capability-making SN74LV244ATPWT optimal for mixed-voltage, hot-plug, or low-quiescent-power designs.

Availability

SN74LV244ATPWT is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution, industrial I/O expansion, and legacy bus interface applications requiring stable component supply and long-term industrial temperature support (–40°C to +85°C).

Supply support for SN74LV244ATPWT 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 company specializing in analog, embedded processing, and logic solutions, with over 50 years of leadership in industrial and automotive electronics.

The SN74LV244ATPWT belongs to TI's LV-A family of low-voltage, 5-V tolerant logic devices, engineered for reliable operation in mixed-signal systems where power efficiency, noise immunity, and interoperability across voltage domains are critical.

FAQ

What is the maximum operating temperature range for SN74LV244ATPWT?

The SN74LV244ATPWT is rated for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per JEDEC JESD78 and supported by TI's production testing across the full temperature span. All electrical specifications-including propagation delay, drive strength, and Ioff leakage-are guaranteed within this range. The TVSOP package's thermal resistance (θJA = 83°C/W) ensures safe junction temperatures under typical load conditions at maximum ambient.

Does SN74LV244ATPWT support hot-swap or live-insertion applications?

Yes, SN74LV244ATPWT supports hot-swap applications through its Ioff feature, which disables outputs and limits leakage to <5 µA when VCC = 0 V-even if input or output pins are biased to valid logic levels. This prevents damaging current backflow during insertion/removal. However, OE pins must be externally pulled high (e.g., via 10-kΩ resistor to system VCC) to guarantee high-impedance state at power-up; TI recommends adding series resistors on A inputs to limit inrush current during live connection.

Can SN74LV244ATPWT interface directly with 3.3-V microcontrollers?

Yes, SN74LV244ATPWT accepts 3.3-V logic levels on its A inputs while operating at 5 V VCC, due to its TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max). Its outputs swing rail-to-rail (0 V to 5 V), so interfacing with 3.3-V receivers requires external level translation or series termination to avoid overvoltage damage. For true bidirectional 3.3-V/5-V translation, a dedicated level shifter is recommended upstream of SN74LV244ATPWT.

What is the recommended decoupling strategy for SN74LV244ATPWT?

TI specifies one 0.1-µF X7R ceramic capacitor placed within 5 mm of each VCC–GND pair (pins 10 and 20), with short, low-inductance traces. For systems with high-frequency switching or multiple SN74LV244ATPWT devices, add a bulk 4.7-µF tantalum or aluminum electrolytic capacitor near the power entry point. Avoid shared vias between decoupling caps and GND planes; use dedicated thermal vias under the GND pad to minimize impedance. Layout guidelines are detailed in TI's SLUA271 for TVSOP packages.

Is SN74LV244ATPWT pin-compatible with other 20-pin octal buffers like SN74LS244 or 74HC244?

No, SN74LV244ATPWT is not pin-compatible with SN74LS244 (SOIC-20) or 74HC244 (SOIC-20) despite identical pin count and function mapping-its TVSOP-20 footprint has 0.65 mm pitch versus 1.27 mm for SOIC, making mechanical substitution impossible without PCB redesign. Electrically, it differs in input thresholds, output drive, and Ioff support. Direct replacement requires verifying both physical layout compatibility and functional equivalence in the target application.