Texas Instruments SN74LVTZ244DW

Overview

SN74LVTZ244DW from Texas Instruments is an octal noninverting buffer/driver with bus-hold inputs, designed for 3.3-V operation and mixed-mode (5-V input/output) interfacing. It features two independent 4-bit sections, separate output-enable (OE) controls, high-impedance outputs during power-up/down, and supports unregulated battery operation down to 2.7 V. Used in backplane interface, memory address buffering, and 3.3-V/5-V level translation circuits.

For engineers reviewing the SN74LVTZ244DW datasheet, SN74LVTZ244DW pinout, SN74LVTZ244DW application, or SN74LVTZ244DW equivalent, key selection criteria include its 20-pin SOIC (DW) package, ±64 mA output drive at 3.3 V, bus-hold input retention, and guaranteed operation from −40°C to 85°C - critical for industrial bus interface and legacy system upgrades.

Technical Context

This device implements Advanced BiCMOS Technology (ABT) to achieve low static power dissipation while maintaining TTL-compatible input thresholds and 5-V tolerant I/Os. Its dual OE control enables independent gating of two 4-bit data paths, and bus-hold circuitry eliminates external pullup resistors on unused inputs.

The SN74LVTZ244DW operates across a 2.7–3.6 V supply range, delivers typical propagation delays of 2.5–5 ns (VCC = 3.3 V), and maintains high-impedance outputs during power transitions - ensuring glitch-free initialization in hot-swap and mixed-voltage systems.

Key Specifications

Pinout & Package

SN74LVTZ244DW uses a 20-pin SOIC (DW) package per JEDEC MS-013, 7.5 mm body width, 2.65 mm max height, 1.27 mm lead pitch. Pin 1 index located at top-left corner with beveled edge marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and SN74LVTH244ADW, the SN74LVTZ244DW uniquely combines 5-V-tolerant I/O, integrated bus-hold, and industrial temperature rating - making it the only option among the three that eliminates external biasing while supporting mixed-voltage backplanes.

Availability

SN74LVTZ244DW is available at Aetrix Electronics and suitable for industrial backplane interface, memory subsystem buffering, and legacy system voltage translation requiring stable component supply and long-term lifecycle continuity.

Supply support for SN74LVTZ244DW 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 headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LVTZ244DW belongs to TI's ABT-family of advanced BiCMOS logic devices, engineered specifically for reliable 3.3-V operation with 5-V signal compatibility in mixed-voltage system interconnects.

FAQ

What is the maximum output current specification for SN74LVTZ244DW?

The SN74LVTZ244DW supports a maximum low-level output current (IOL) of 64 mA and high-level output current (IOH) of −32 mA at VCC = 3.3 V, as specified in the recommended operating conditions table. This drive strength allows direct interfacing with standard TTL loads and multiple CMOS inputs without external buffering. The device maintains these ratings across its full industrial temperature range (−40°C to 85°C).

Does SN74LVTZ244DW require external pullup resistors on unused inputs?

No, SN74LVTZ244DW does not require external pullup resistors on unused inputs because it integrates active bus-hold circuitry. Each input draws ±75 µA to maintain a valid logic state when floating, eliminating the need for discrete components. This feature reduces bill-of-materials cost and PCB real estate, particularly in systems with partially utilized data buses.

Can SN74LVTZ244DW operate with a 2.7-V supply?

Yes, SN74LVTZ244DW is fully characterized to operate at VCC as low as 2.7 V, supporting unregulated battery-powered applications. At this minimum supply, it maintains functional I/O thresholds (VIH = 2.0 V, VIL = 0.8 V), 48 mA IOL, and guaranteed timing performance - enabling use in brownout-prone systems such as portable instrumentation or remote sensors.

What is the pin-compatible replacement for SN74LVTZ244DW?

There is no documented pin-compatible replacement for SN74LVTZ244DW. While SN74LVTH244ADW shares the same 20-pin SOIC (DW) package and pinout, it lacks bus-hold functionality and has different output characteristics. Any substitution requires validation of input biasing, timing margins, and 5-V tolerance requirements in the target application.

What thermal considerations apply to SN74LVTZ244DW in continuous operation?

SN74LVTZ244DW has a maximum power dissipation of 1.6 W in the DW package at TA = 55°C (still air). For continuous operation, thermal design must ensure junction temperature remains ≤150°C. With θJA ≈ 65°C/W (typical for SOIC-20), sustained 15 mA ICC at 3.3 V yields ~50 mW dissipation - well within limits, but high-output-current operation (>32 mA per output) requires attention to PCB copper area and airflow.