Texas Instruments SN74AUCH16244DGVR

Overview

SN74AUCH16244DGVR from Texas Instruments is a 16-bit 3-state buffer/driver optimized for 1.65–1.95 V operation, featuring ±8-mA output drive at 1.8 V, 1.8 ns max propagation delay, bus-hold inputs eliminating external resistors, and Ioff support for partial-power-down mode. It serves as a high-density memory address or clock driver in low-voltage embedded bus systems.

For engineers reviewing the SN74AUCH16244DGVR datasheet, SN74AUCH16244DGVR pinout, SN74AUCH16244DGVR application, or SN74AUCH16244DGVR equivalent, key selection criteria include 1.8-V tpd performance, 3.6-V I/O tolerance for mixed-mode interfacing, bus-hold functionality, Ioff-enabled power sequencing, and TVSOP-48 package thermal resistance (58°C/W).

Technical Context

This device implements four independent 4-bit noninverting buffers with symmetrical active-low OE controls - 1OE, 2OE, 3OE, and 4OE - each enabling its associated 4-bit channel. Output enable logic is asynchronous and fully specified down to 0.8 V, supporting robust power-up/down sequencing.

Bus-hold circuitry actively maintains valid logic states on undriven inputs without external components, while Ioff isolation prevents backflow current when VCC = 0 V. The architecture supports flexible partitioning: one 16-bit, two 8-bit, or four 4-bit buffers within a single TVSOP-48 package.

Key Specifications

Pinout & Package

SN74AUCH16244DGVR uses a 48-pin Thin Very Small Outline Package (TVSOP-DGV), 7.1 mm × 10.2 mm body, 0.4 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant, with θJA = 58°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR, SN74AUCH16244DGVR delivers superior low-voltage operation and integrated bus-hold; compared with SN74AVC16244DGVR, it trades 0.4 ns speed for proven maturity and tighter 1.65–1.95 V optimization - making it ideal for cost-sensitive, volume-deployed 1.8-V memory interfaces.

Availability

SN74AUCH16244DGVR is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, low-voltage bus interfaces, and partial-power-down embedded controllers requiring stable component supply and long-term lifecycle support.

Supply support for SN74AUCH16244DGVR 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 leadership in interface and bus technologies.

SN74AUCH16244DGVR belongs to TI's Widebus™ family - engineered specifically to increase density and performance of 3-state memory address drivers, clock drivers, and bus-oriented receivers/transmitters in sub-2-V systems.

FAQ

What is the minimum operating voltage for SN74AUCH16244DGVR?

The SN74AUCH16244DGVR operates down to 0.8 V VCC, with guaranteed functionality across the full recommended range of 0.8 V to 2.7 V. Its design is specifically optimized for 1.65–1.95 V operation, where parameters like tpd = 1.8 ns and ±8-mA drive are characterized. Below 1.65 V, timing and drive strength degrade predictably per datasheet curves.

Does SN74AUCH16244DGVR require external pullup resistors on its inputs?

No - SN74AUCH16244DGVR integrates bus-hold circuitry on all data inputs (A1–A16) and OE pins, actively maintaining valid logic states without external components. Using pullup or pulldown resistors with enabled bus-hold is explicitly discouraged in the datasheet, as it may cause contention or excessive current draw.

Can SN74AUCH16244DGVR safely interface between 1.8-V and 3.3-V logic domains?

Yes - SN74AUCH16244DGVR features 3.6-V I/O tolerance on all inputs and outputs, meaning it can accept and drive signals up to 3.6 V regardless of VCC (which may be as low as 0.8 V). This allows direct connection to 3.3-V peripherals without level shifters, provided output loading remains within ±8-mA limits at 1.8 V.

How does the Ioff feature function in SN74AUCH16244DGVR during power-down?

The Ioff circuitry in SN74AUCH16244DGVR disables all outputs when VCC = 0 V, blocking current flow from live I/O lines into the unpowered device. This prevents damaging back-current in partial-power-down scenarios - for example, when memory chips are powered off while the CPU bus remains active - and complies with JESD78 Class II latch-up immunity.

What is the thermal performance of SN74AUCH16244DGVR in its TVSOP package?

SN74AUCH16244DGVR in the TVSOP-48 (DGV) package has a junction-to-ambient thermal resistance (θJA) of 58°C/W under standard JEDEC test conditions. This value assumes a 1-in² 2-oz copper pad with 2 vias; actual board-level performance depends on PCB copper area, airflow, and adjacent heat sources - design guidelines are published in TI's SC package documentation.