Texas Instruments SN74ABT16541ADLR

Overview

SN74ABT16541ADLR from Texas Instruments is a noninverting 16-bit buffer/driver with dual 3-state output-enable control per 8-bit section, operating at 4.5–5.5 V, delivering –32-mA high-level and 64-mA low-level output drive, and specified for –40°C to 85°C industrial temperature range. It enables bidirectional data bus isolation in high-speed memory and address buffering applications.

For engineers reviewing the SN74ABT16541ADLR datasheet, SN74ABT16541ADLR pinout, SN74ABT16541ADLR application, or SN74ABT16541ADLR equivalent, key selection criteria include its flow-through pinout for PCB layout optimization, distributed V_CC/GND configuration for noise suppression, EPIC-II^B BiCMOS process for low power dissipation, and latch-up immunity exceeding 500 mA per JEDEC JESD-17.

Technical Context

This device implements two independent 8-bit noninverting buffer sections, each requiring both OE inputs (e.g., 1OE1 and 1OE2) to be low for Y outputs to be active; either OE high forces that section's outputs into high-impedance state. Its EPIC-II^B BiCMOS architecture combines bipolar speed with CMOS input characteristics and low static current.

The DL-package variant uses a 48-pin shrink small-outline (SSOP) with 0.5-mm pitch, featuring distributed power/ground pins and flow-through signal routing-pin 1 (1OE1) to pin 48 (2OE2)-to minimize trace length and crosstalk in dense bus interfaces.

Key Specifications

Pinout & Package

SN74ABT16541ADLR is housed in a 48-pin SSOP (DL) package with 0.5-mm pitch, 12.6 mm × 6.2 mm body, and 1.2-mm max height. Pin 1 is marked by a notch or dot in Quadrant Q1 of the tape reel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR, SN74ABT16541ADLR delivers 2.7× higher sink current and native 5-V operation, eliminating level shifters; versus SN74ABT16244DLR, it avoids mandatory signal inversion, simplifying timing-critical bus designs where polarity must be preserved.

Availability

SN74ABT16541ADLR is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and legacy bus interface designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74ABT16541ADLR 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 over 90 years of innovation in high-reliability components.

The SN74ABT16541ADLR belongs to TI's Widebus™ family of high-speed bus interface devices, engineered specifically for noise-resilient, high-fan-out data path buffering in industrial and computing infrastructure.

FAQ

What is the recommended power-up sequence for SN74ABT16541ADLR to ensure outputs remain in high-impedance state?

TI recommends tying all OE inputs (1OE1, 1OE2, 2OE1, 2OE2) to V_CC via pullup resistors during power-up. The minimum resistor value depends on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ. This ensures outputs stay in high-Z until firmware asserts valid OE control, preventing bus contention. The SN74ABT16541ADLR's internal design does not guarantee high-Z at power-on without external biasing.

Can SN74ABT16541ADLR safely interface between a 3.3-V microcontroller and a 5-V memory bus?

Yes - the SN74ABT16541ADLR accepts 3.3-V logic levels as valid inputs (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), and its 5-V supply enables full-swing 5-V output drive. No level shifter is needed. However, ensure the microcontroller's I/O pins tolerate 5-V inputs if outputs are accidentally enabled toward the MCU side; SN74ABT16541ADLR has no input protection beyond standard clamp diodes.

What is the maximum capacitive load SN74ABT16541ADLR can drive while maintaining guaranteed timing specs?

The SN74ABT16541ADLR's switching characteristics (e.g., t_PLH, t_PHL) are characterized at CL = 50 pF. While it can drive heavier loads (e.g., 100 pF), propagation delays increase nonlinearly beyond this point - t_PHL may exceed 6 ns at 100 pF. For timing-critical 100-MHz+ buses, keep net capacitance ≤50 pF using controlled-impedance routing and minimized stub lengths.

Does SN74ABT16541ADLR support hot-swap or live-insertion into an energized backplane?

The SN74ABT16541ADLR features I_OFF ≤ ±100 µA when V_CC = 0 V and inputs/outputs ≤ 4.5 V, enabling partial hot-swap capability. However, TI does not qualify it for full hot-plug standards (e.g., PCI Hot-Plug). For safe insertion, ensure OE pins are held high (via pullups) and V_CC ramps before applying signal voltages. Always verify system-level ESD and inrush behavior separately.

How does the distributed V_CC/GND pin arrangement in SN74ABT16541ADLR improve noise performance?

The SN74ABT16541ADLR places eight V_CC and eight GND pins alternately across the 48-pin DL package - reducing power delivery loop inductance by shortening current return paths. This configuration cuts simultaneous switching output (SSO) noise (V_OLP) to <0.8 V, versus >1.5 V in legacy packages, directly improving signal integrity on shared buses and easing EMC compliance.