Texas Instruments SN74ALVCH16244DL

Overview

SN74ALVCH16244DL from Texas Instruments is a 16-bit non-inverting buffer/driver with 3-state outputs, designed for 1.65 V to 3.6 V operation. It features ±24-mA output drive at 3.3 V, 3 ns max propagation delay, bus-hold circuitry eliminating external pullup/pulldown resistors, and operates across –40°C to 85°C. It is used in memory address buffering, clock distribution, and bus interface applications where level translation and high-density drive capability are required.

For engineers reviewing the SN74ALVCH16244DL datasheet, SN74ALVCH16244DL pinout, SN74ALVCH16244DL application, or SN74ALVCH16244DL equivalent, key selection criteria include its 48-pin SSOP (DL) package, active-low 3-state enable architecture, bus-hold input retention, 1.65–3.6 V supply range, and compatibility with mixed-voltage system interconnects.

Technical Context

The SN74ALVCH16244DL implements four independent 4-bit buffer sections, each with symmetrical active-low output-enable (OE) inputs controlling true outputs. Its bus-hold circuitry actively maintains valid logic states on undriven inputs without external components, reducing BOM count and layout complexity.

It supports hot-insertion due to Ioff protection, meets JESD 17 latch-up immunity (>250 mA), and provides ESD robustness per JESD 22 (2000-V HBM, 200-V MM). Input thresholds scale with VCC, enabling reliable interfacing across 1.65 V, 2.5 V, and 3.3 V domains.

Key Specifications

Pinout & Package

SN74ALVCH16244DL is housed in a 48-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.5 mm lead pitch, JEDEC MO-153 compliant, body dimensions 12.5 mm × 6.1 mm × 1.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16244DL, SN74LVC16244ADLR requires external pull resistors and delivers lower drive below 3.3 V, while 74ALVCH16244DLR offers identical performance in a different packaging format-making SN74ALVCH16244DL optimal for low-volume prototyping or manual assembly where tube packaging is preferred.

Availability

SN74ALVCH16244DL is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bus interface applications requiring stable component supply, long-term industrial lifecycle support, and consistent SSOP-DL package availability.

Supply support for SN74ALVCH16244DL 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 experience in high-reliability industrial and automotive-grade components.

The SN74ALVCH16244DL belongs to TI's Widebus™ family of advanced logic devices, engineered specifically to increase density and performance in 3-state memory address drivers, clock drivers, and bus-oriented receivers/transmitters.

FAQ

What is the recommended power-up sequence for SN74ALVCH16244DL to ensure high-impedance outputs?

To guarantee high-impedance outputs during power-up, tie all OE inputs (1OE–4OE) to VCC through a pullup resistor. The minimum resistance value depends on the driver's current-sinking capability; TI recommends ≥10 kΩ for typical applications. This prevents unintended output activation before system control logic initializes, avoiding bus contention or false writes in memory or peripheral interfaces using SN74ALVCH16244DL.

Does SN74ALVCH16244DL support mixed-voltage operation between 1.8 V and 3.3 V domains?

Yes, SN74ALVCH16244DL supports mixed-voltage operation: its 1.65–3.6 V supply range and scalable input thresholds (e.g., VIH = 0.65×VCC at 1.65 V, 2.0 V at 3.3 V) allow direct interfacing between 1.8 V, 2.5 V, and 3.3 V logic domains without external level shifters. When powered at 2.5 V, SN74ALVCH16244DL reliably accepts 1.8 V inputs and drives 3.3 V-tolerant receivers, making it ideal for heterogeneous voltage system interconnects.

How does the bus-hold feature of SN74ALVCH16244DL eliminate external pullup resistors?

The bus-hold circuitry in SN74ALVCH16244DL actively detects and reinforces the last valid logic state on each input (±75 µA hold current at 3 V), maintaining stable HIGH or LOW levels without external components. Using pullup/pulldown resistors with enabled bus-hold is not recommended, as they conflict with internal biasing. This feature reduces BOM count, PCB area, and layout complexity-especially valuable in dense 16-bit bus designs where SN74ALVCH16244DL serves as a compact, self-stabilizing interface.

Can SN74ALVCH16244DL be used in hot-swap applications, and what protection does it offer?

Yes, SN74ALVCH16244DL supports hot-swap applications via Ioff circuitry, which disables all I/Os when VCC = 0 V, preventing damaging current flow during live insertion. It also exceeds JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM). These features make SN74ALVCH16244DL suitable for modular systems like telecom line cards or industrial I/O modules where field-replaceable units require safe, zero-power-state isolation.

What is the thermal performance of SN74ALVCH16244DL in its SSOP-DL package?

SN74ALVCH16244DL in the DL package has a junction-to-ambient thermal resistance (θJA) of 63°C/W under standard JEDEC conditions. At maximum rated power dissipation (19 mW typical at 3.3 V, 10 MHz), junction temperature rise remains within safe limits (<2°C) for ambient temperatures up to 85°C. For high-density layouts, use of multiple VCC/GND pins and thermal vias beneath the exposed pad (if present) further enhances heat dissipation-critical for sustained operation in SN74ALVCH16244DL-based clock or address driver circuits.