Texas Instruments SN74ALB16244DLR

Overview

SN74ALB16244DLR from Texas Instruments is a 16-bit non-inverting buffer/driver with 3-state outputs, designed for high-speed 3.3-V operation in bus interface applications. It features 2 ns typical propagation delay, ±25 mA output drive capability, and industry-standard '16244 pinout. Used in memory address/data buffering and backplane driving where low-voltage compatibility and noise immunity are critical.

For engineers reviewing the SN74ALB16244DLR datasheet, SN74ALB16244DLR pinout, SN74ALB16244DLR application, or SN74ALB16244DLR equivalent, key selection criteria include 3.3-V supply compliance, 3-state control timing (2.5 ns typical enable/disable), distributed V_CC/GND pins for noise suppression, and flow-through architecture for optimized PCB routing.

Technical Context

This device implements four independent 4-bit buffers, each with symmetrical active-low output-enable (OE) inputs and true (non-inverting) logic. Each buffer section operates with unity-gain input amplifiers and feedback resistors to minimize offset voltage and achieve sub-2 ns propagation delay at 3.3 V.

It uses Advanced Low-Voltage BiCMOS (ALB) technology with Schottky diodes on all inputs to suppress overshoot/undershoot, and features distributed power/ground pins across the 48-pin SSOP package to reduce high-speed switching noise. The flow-through pinout places inputs and outputs on opposite sides of the package to simplify trace routing.

Key Specifications

Pinout & Package

SN74ALB16244DLR is housed in a 48-pin SSOP (Shrink Small-Outline Package) with 0.5-mm lead pitch, 12.4–12.6 mm body width, and 6.0–6.2 mm body length. The package supports surface-mount reflow assembly and meets JEDEC MO-153 mechanical standards.

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 74ABT16244CSSPX, SN74ALB16244DLR uniquely balances 3.3-V compatibility, 25-mA drive, and sub-2-ns speed without requiring level shifters or sacrificing noise immunity - making it optimal for industrial backplane and memory interface designs where ALB process advantages matter.

Availability

SN74ALB16244DLR is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and programmable logic I/O expansion requiring stable component supply and long-term obsolescence management.

Supply support for SN74ALB16244DLR 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 components.

The SN74ALB16244DLR belongs to TI's Widebus™ family of high-speed bus interface devices, engineered specifically for low-voltage, high-density PCB applications demanding minimal propagation delay and robust noise immunity.

FAQ

What is the maximum operating temperature range for SN74ALB16244DLR?

The SN74ALB16244DLR is rated for operation from –40°C to +85°C, meeting industrial temperature requirements. This range is confirmed in the "Recommended Operating Conditions" table of the SCBS647D datasheet and applies specifically to the DL package variant. The thermal performance is supported by a θ_JA of 63°C/W, enabling reliable operation in enclosed enclosures without forced airflow when power dissipation remains within specification limits for the SN74ALB16244DLR.

Does SN74ALB16244DLR support 3.3-V-only operation, or can it tolerate 5-V inputs?

SN74ALB16244DLR is designed exclusively for 3.3-V operation, with absolute maximum V_CC of 4.6 V and recommended V_CC range of 3.0 V to 3.6 V. Its inputs are not 5-V tolerant - applying 5-V signals violates the absolute maximum input voltage rating of V_CC + 0.5 V (≤4.1 V at 3.6 V). Therefore, SN74ALB16244DLR must be used in strictly 3.3-V systems or with external level-shifting circuitry for higher-voltage interfaces.

How many independent 3-state control inputs does SN74ALB16244DLR provide?

SN74ALB16244DLR provides four independent active-low output-enable (OE) inputs: 1OE (pin 1), 2OE (pin 24), 3OE (pin 25), and 4OE (pin 48). Each controls a separate 4-bit buffer section (1Y1–1Y4, 2Y1–2Y4, etc.), allowing granular bus segmentation and partial enablement - a key feature confirmed in the FUNCTION TABLE and top-side marking diagram of the SN74ALB16244DLR datasheet.

What package type and dimensions does SN74ALB16244DLR use?

SN74ALB16244DLR uses a 48-pin SSOP (Shrink Small-Outline Package) with designation DL, measuring 12.4–12.6 mm in width and 6.0–6.2 mm in length, and featuring a 0.5-mm lead pitch. Mechanical drawings in the SCBS647D datasheet and TI's packaging addendum confirm this footprint, which complies with JEDEC MO-153 and supports standard SMT reflow profiles without modification for the SN74ALB16244DLR.

Is SN74ALB16244DLR pin-compatible with older 74-series 16-bit buffers like SN74F244?

Yes - SN74ALB16244DLR implements the industry-standard '16244 pinout, which is functionally and physically identical to SN74F244 and SN74LS244 pin assignments for inputs, outputs, and OE controls. However, SN74ALB16244DLR operates at 3.3 V and delivers faster timing (2 ns vs. ~10 ns), so while pinout matches, voltage-level and speed differences require system-level validation before drop-in replacement in legacy 5-V designs using SN74ALB16244DLR.