Texas Instruments SN74ALB16244DL

Overview

SN74ALB16244DL from Texas Instruments is a 16-bit noninverting buffer/driver with 3-state outputs, designed for high-speed 3.3-V operation in bus interface and data routing applications. It features 2-ns typical propagation delay, ±25-mA output drive capability, industry-standard '16244 pinout, and Schottky-clamped inputs to suppress overshoot/undershoot. Used in backplane drivers, memory address buffers, and FPGA I/O expansion.

For engineers reviewing the SN74ALB16244DL datasheet, SN74ALB16244DL pinout, SN74ALB16244DL application, or SN74ALB16244DL equivalent, key selection criteria include 3.3-V supply compatibility, 48-pin SSOP (DL) package footprint, true-output logic with active-low OE control, and thermal performance under high-speed switching loads.

Technical Context

The SN74ALB16244DL implements four independent 4-bit buffer sections, each with symmetrical active-low output-enable (OE) control and true (noninverting) signal path. Its ALB BiCMOS process enables 3.3-V operation while maintaining TTL-compatible input thresholds and low-noise switching via distributed V_CC/GND pins.

Each buffer uses a unity-gain amplifier architecture with feedback resistors to minimize propagation delay and ensure tight input-to-output tracking with sub-100-mV offset. Flow-through pin arrangement supports optimized PCB layout by separating inputs and outputs on opposite sides of the 48-pin SSOP package.

Key Specifications

Pinout & Package

SN74ALB16244DL is housed in a 48-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.5-mm lead pitch, 12.6 mm × 6.2 mm body size, and 1.2-mm max height. Pin 1 identifier located at top-left corner with beveled edge marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADLR and 74ABT16244CMTD, the SN74ALB16244DL delivers the lowest propagation delay (1.3 ns) and integrated input clamping - making it optimal for high-speed, noise-critical 3.3-V bus buffering where timing margin and signal fidelity are primary constraints.

Availability

SN74ALB16244DL is available at Aetrix Electronics and suitable for backplane data buffering, FPGA I/O expansion, memory address latching, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ALB16244DL 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74ALB16244DL belongs to TI's Widebus™ family of high-speed interface ICs, engineered specifically for low-voltage, high-fanout bus driving in demanding digital systems where timing precision and noise immunity are critical.

FAQ

What is the maximum operating temperature range for the SN74ALB16244DL?

The SN74ALB16244DL is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range ensures reliable functionality in uncontrolled environments such as factory automation panels, outdoor telecom equipment, and motor control cabinets where thermal management is limited. The device's 63°C/W junction-to-ambient thermal resistance supports sustained operation within this envelope when mounted on standard FR-4 PCBs with adequate copper pour.

Does the SN74ALB16244DL support hot-swap or live-insertion applications?

The SN74ALB16244DL does not include built-in hot-swap protection circuitry such as slew-rate limiting or undervoltage lockout. However, its Schottky-clamped inputs and 3-state outputs allow safe insertion into powered backplanes when OE is held high during insertion - preventing bus contention. For robust hot-swap compliance, external series resistors and TVS diodes are recommended. Always verify system-level sequencing per TI Application Report SCBA015.

Can the SN74ALB16244DL be used with 2.5-V or 5-V logic families?

The SN74ALB16244DL is specified only for 3.3-V operation (V_CC = 3.0 V to 3.6 V) and is not 5-V tolerant. Its inputs meet TTL thresholds but lack overvoltage protection above V_CC + 0.5 V. Interfacing with 2.5-V systems requires level translation due to VIH(min) = 2.0 V at V_CC = 3.3 V. Direct connection to 5-V logic risks damage and violates absolute maximum ratings - always use a compatible translator like SN74AVC16T245 for mixed-voltage interconnects.

How many independent buffer sections does the SN74ALB16244DL contain?

The SN74ALB16244DL contains four independent 4-bit noninverting buffer sections, each controlled by its own active-low output-enable input (1OE through 4OE). This segmentation allows selective activation of subsets of the 16 outputs - for example, using only the first 8 bits for address latching while keeping the remaining 8 bits in high-impedance state to reduce dynamic power and avoid bus conflicts.

Is the SN74ALB16244DL pin-compatible with older 74-series buffers like the 74F16244?

Yes, the SN74ALB16244DL uses the industry-standard '16244 pinout, matching pin-for-pin with legacy 74F16244, 74ACT16244, and 74LVT16244 devices in the same 48-pin SSOP (DL) package. This enables direct replacement in existing designs without layout changes - provided the system operates within the SN74ALB16244DL's 3.3-V supply and temperature specifications.