Texas Instruments SN74ABT16244ADLR

Overview

SN74ABT16244ADLR from Texas Instruments is a 16-bit noninverting buffer/driver with 3-state outputs, designed for high-density bus interfacing in memory address, clock, and data transmission systems. It operates from 4.5 V to 5.5 V, delivers ±32 mA high-drive outputs, supports –40°C to 85°C industrial temperature range, and uses SSOP-48 (DL) package with flow-through pinout for optimized PCB layout.

For engineers reviewing the SN74ABT16244ADLR datasheet, SN74ABT16244ADLR pinout, SN74ABT16244ADLR application, or SN74ABT16244ADLR equivalent, key selection criteria include output drive strength (–32 mA IOH / 64 mA IOL), 3-state enable timing (tPZH ≤ 4.8 ns), low ground bounce (VOLP < 1 V), distributed power/ground pinning, and compatibility with 5-V TTL/CMOS logic families.

Technical Context

This device implements four independent 4-bit noninverting buffers, each with active-low 3-state output-enable (OE) control. Its EPIC-IIB™ BiCMOS architecture enables high-speed switching while reducing power dissipation versus standard bipolar designs.

The flow-through pinout separates inputs and outputs on opposite sides of the SSOP-48 package, minimizing trace crossovers. Distributed VCC and GND pins across all four quadrants suppress simultaneous switching noise, and internal clamping diodes support latch-up immunity exceeding 500 mA per JESD 70.

Key Specifications

Pinout & Package

SN74ABT16244ADLR uses a 48-pin Shrink Small-Outline Package (SSOP-DL) with 0.635 mm lead pitch, 12.6 mm × 7.9 mm body, and 1.2 mm max height. Pin 1 is located at top-left corner (Q1 quadrant), with flow-through layout separating input banks (A1–A4 per group) from output banks (Y1–Y4 per group) and OE controls (1OE–4OE).

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 SN74ABT16244ADGVR, the SN74ABT16244ADLR provides native 5-V operation and mechanical compatibility with legacy SSOP footprints, making it optimal for industrial upgrades and mixed-voltage backplanes where voltage translation or board redesign is impractical.

Availability

SN74ABT16244ADLR is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial backplanes, and legacy bus interface designs requiring stable component supply and long-term industrial temperature support.

Supply support for SN74ABT16244ADLR 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 logic solutions with emphasis on reliability, performance, and broad application coverage.

The SN74ABT16244ADLR belongs to TI's Widebus™ family of high-speed bus-interface ICs, engineered specifically to improve density and signal integrity in memory addressing, clock fanout, and bus-oriented transmitter/receiver systems.

FAQ

What is the recommended power-up sequence for SN74ABT16244ADLR to avoid bus contention?

TI specifies that OE pins must be held high (inactive) during power-up to maintain outputs in high-impedance state. This is achieved by tying each OE to VCC through a pullup resistor; minimum value depends on driver sink capability but typically ≥1 kΩ suffices. The SN74ABT16244ADLR does not require strict VCC ramp sequencing-its internal structure ensures safe initialization without external reset coordination.

Does SN74ABT16244ADLR support hot-swap or live-insertion applications?

SN74ABT16244ADLR is not rated for hot-swap operation. While its Ioff (±100 µA) and bus-hold characteristics limit leakage during partial power, the device lacks explicit hot-swap protection features such as slew-rate controlled outputs or undervoltage lockout. For live-insertion, external current-limiting resistors and sequencing controllers are required-TI recommends evaluating SN74CBT16244 for true hot-swap compliance.

Can SN74ABT16244ADLR drive a 100-pF load while maintaining timing specifications?

Yes. The SN74ABT16244ADLR's switching characteristics (tPLH/tPHL ≤ 3.5 ns) are specified at CL = 50 pF, but its 64 mA IOL and low output impedance enable reliable operation up to ~120 pF. At 100 pF, measured tPLH increases to ~5.2 ns (still within most 25-MHz bus timing budgets), and VOL remains ≤0.55 V-verified in TI application report SCBA004 using standard test loads.

What is the maximum junction temperature for continuous operation of SN74ABT16244ADLR?

The SN74ABT16244ADLR has a maximum junction temperature (TJ) of 150°C. With θJA = 94°C/W (DL package), sustained 32 mA ICC at 5.5 V yields ~175 mW dissipation, limiting ambient temperature to ~133°C at zero airflow. For industrial use at 85°C ambient, derating is unnecessary; thermal design should ensure case-to-ambient rise stays below 65°C using standard PCB copper pour.

Are the input pins of SN74ABT16244ADLR 5-V tolerant when operated at 3.3-V supply?

No. SN74ABT16244ADLR is a 5-V-only device with absolute maximum VI rating of –0.5 V to 7 V, but its input thresholds (VIH = 2 V, VIL = 0.8 V) and internal structure assume VCC = 4.5–5.5 V. Operating VCC at 3.3 V violates recommended conditions and causes undefined logic behavior, increased propagation delay, and potential latch-up. Use SN74LVC16244A for 3.3-V operation.