Texas Instruments 74ALVTH16244VRE4

Overview

74ALVTH16244VRE4 from Texas Instruments is a 16-bit noninverting buffer/driver with 3-state outputs, designed for 2.5-V/3.3-V V_CC operation and 5-V I/O tolerance. It delivers ±32 mA high-drive capability, supports mixed-mode signal interfacing (5-V inputs/outputs with 3.3-V supply), and integrates bus-hold circuitry to eliminate external pullup/pulldown resistors - used in backplane interface and legacy TTL-to-3.3-V system bridging.

For engineers reviewing the 74ALVTH16244VRE4 datasheet, 74ALVTH16244VRE4 pinout, 74ALVTH16244VRE4 application, or 74ALVTH16244VRE4 equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V signal environments, auto 3-state behavior above V_CC, hot-insertion support via I_off and power-up 3-state, and guaranteed 2.3-V minimum unregulated battery operation.

Technical Context

This device implements four independent 4-bit buffer sections, each controlled by dedicated output-enable (OE) inputs (1OE–4OE), enabling flexible partitioning as 4×4-bit, 2×8-bit, or 1×16-bit drivers. Its Advanced BiCMOS Technology (ABT) architecture ensures low static power dissipation while maintaining TTL-compatible thresholds at 3.3-V V_CC.

Bus-hold circuitry actively maintains valid logic levels on floating data inputs without external components, and auto 3-state triggers when output voltage exceeds V_CC, preventing bus contention during overvoltage transients. I_off protection disables outputs during power-down to block reverse current flow, critical for live insertion in modular systems.

Key Specifications

Pinout & Package

74ALVTH16244VRE4 is packaged in a 48-pin Thin Shrink Small-Outline Package (TSSOP, DGG), 7.9 mm × 12.5 mm body, 0.5 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit 3-state buffer applications.

Compared with SN74LVC16244ADGGR and 74ALVCH16244GR, the 74ALVTH16244VRE4 uniquely combines 5-V I/O tolerance, auto 3-state, bus-hold, and hot-swap readiness - making it the sole option for upgrading legacy 5-V buses to 3.3-V logic without redesigning signal conditioning.

Availability

74ALVTH16244VRE4 is available at Aetrix Electronics and suitable for backplane interface, legacy system upgrade, modular hot-swap chassis, and unregulated battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVTH16244VRE4 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 innovation in high-reliability interface and power management ICs.

The ALVTH family targets mixed-voltage system bridging, delivering robust 5-V tolerant buffering for 3.3-V digital systems - specifically engineered for telecom infrastructure, industrial automation, and test equipment demanding hot-swap readiness and unregulated supply operation.

FAQ

What voltage levels can 74ALVTH16244VRE4 tolerate on its inputs and outputs?

The 74ALVTH16244VRE4 accepts input voltages from 0 V to 5.5 V and tolerates output voltages up to 5.5 V in high-impedance or power-off states. Its 5-V I/O compatibility enables direct interfacing with legacy TTL systems while operating from a 3.3-V supply - a key differentiator from standard LVC-family buffers. This specification is verified across –40°C to 85°C ambient temperature.

Does 74ALVTH16244VRE4 require external pullup resistors on unused inputs?

No. The 74ALVTH16244VRE4 integrates active bus-hold circuitry on all data inputs, which maintains floating inputs at valid logic-high or logic-low levels without external components. Each input draws ±75 µA (at V_CC = 3 V) to sustain state - eliminating 16 pullup/pulldown resistors and associated PCB space, BOM cost, and reliability risk.

How does the auto 3-state feature of 74ALVTH16244VRE4 protect system buses?

The auto 3-state feature in 74ALVTH16244VRE4 forces outputs into high-impedance mode whenever output voltage exceeds V_CC, preventing bus contention during overvoltage transients such as ESD events or supply sequencing mismatches. This behavior is intrinsic to the ABT process and requires no external circuitry - unlike standard buffers that rely solely on OE control.

Can 74ALVTH16244VRE4 operate from an unregulated battery source?

Yes. The 74ALVTH16244VRE4 is specified to operate continuously down to V_CC = 2.3 V, supporting single-cell Li-ion (3.0–4.2 V), NiMH (1.2 V/cell), or alkaline (1.5 V/cell) battery configurations without regulation. Its ABT design maintains full logic functionality and drive strength across this range - confirmed in TI's SCES070G datasheet Section 4.

What package type is used for 74ALVTH16244VRE4 and what are its key mechanical features?

The 74ALVTH16244VRE4 uses a 48-pin Thin Shrink Small-Outline Package (TSSOP, DGG) measuring 7.9 mm × 12.5 mm with 0.5 mm lead pitch and 1.2 mm maximum height. It complies with JEDEC MO-153, features seven GND pins and four V_CC pins for low-noise operation, and supports standard reflow profiles per TI's packaging addendum.