Texas Instruments SN74ABT16240ADLRG4

Overview

SN74ABT16240ADLRG4 from Texas Instruments is a 16-bit inverting buffer/driver with 3-state outputs, designed for high-density memory address and bus-oriented applications. It operates from 4.5 V to 5.5 V, delivers ±32 mA/±64 mA output drive, features distributed V_CC/GND pins to suppress switching noise, and is rated for –40°C to 85°C industrial operation.

For engineers reviewing the SN74ABT16240ADLRG4 datasheet, SN74ABT16240ADLRG4 pinout, SN74ABT16240ADLRG4 application, or SN74ABT16240ADLRG4 equivalent, this device serves as a high-drive, low-ground-bounce solution for 3-state bus buffering in memory subsystems, clock distribution networks, and address/data transceivers where flow-through PCB layout and latch-up immunity (>500 mA) are critical.

Technical Context

This device implements four independent 4-bit inverting buffers, each with symmetrical active-low output-enable (OE) control. Its EPIC-II^B BiCMOS architecture enables high-speed switching (t_PLH/t_PHL ≤ 4.7 ns at 5 V, 25°C) while maintaining low power dissipation and robust noise immunity via distributed power/ground pinning.

The flow-through pinout minimizes trace crossing on PCBs, and the high-drive capability (–32 mA I_OH, 64 mA I_OL) supports driving heavy capacitive loads and multiple TTL inputs. Output ground bounce (V_OLP) remains below 1 V at V_CC = 5 V, TA = 25°C - critical for signal integrity in dense digital systems.

Key Specifications

Pinout & Package

SN74ABT16240ADLRG4 uses a 48-pin Plastic Shrink Small-Outline Package (SSOP, DL), 380-mil body width, 0.5-mm pitch, 1.2-mm max height, with pin 1 located in quadrant Q1 per tape-and-reel orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT16240ADLRG4, SN74ABT16244ADLRG4 preserves signal polarity but requires no logic inversion in downstream circuitry, while SN74LVC16244ADGGR reduces power and size at the cost of voltage range and drive strength - making it unsuitable as a drop-in replacement in 5-V bus environments.

Availability

SN74ABT16240ADLRG4 is available at Aetrix Electronics and suitable for memory subsystem design, industrial bus interface development, and legacy 5-V logic consolidation requiring stable component supply and long-term manufacturability.

Supply support for SN74ABT16240ADLRG4 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 expertise in high-reliability interface and bus technologies.

The ABT logic family - including SN74ABT16240ADLRG4 - was engineered for high-speed, high-drive 5-V bus buffering in memory, computing, and industrial control systems where noise immunity and layout efficiency are critical.

FAQ

What is the recommended power-up sequence for SN74ABT16240ADLRG4 to avoid bus contention?

TI recommends tying all OE pins to V_CC through a pull-up resistor (value determined by driver sink capability) before applying V_CC. This ensures outputs remain in high-impedance state during power ramp-up. The SN74ABT16240ADLRG4 does not require special sequencing between V_CC and OE, but OE must be held high until system firmware asserts control. This prevents unintended drive on shared buses during reset.

Can SN74ABT16240ADLRG4 drive a 100-pF load while maintaining TTL-compatible output levels?

Yes. At V_CC = 5 V and I_OL = 48 mA, SN74ABT16240ADLRG4 guarantees VOL ≤ 0.55 V - well within TTL's 0.8 V V_IL limit - even with 100-pF capacitive loading. Its 64 mA sink capability exceeds typical 100-pF dynamic current demands, and the 4.7 ns max propagation delay ensures timing margins hold across temperature and voltage corners.

Is SN74ABT16240ADLRG4 compatible with 3.3-V input signals?

No. SN74ABT16240ADLRG4 is a 5-V-only device with VIH = 2.0 V minimum and VIL = 0.8 V maximum. While 3.3-V logic outputs often meet these thresholds, TI does not guarantee interoperability outside the specified 4.5–5.5 V V_CC range. For mixed-voltage systems, level translators or 3.3-V–tolerant ABT variants (e.g., SN74ABT16240A with V_I ratings extended) should be verified separately.

How does the distributed V_CC/GND pin configuration improve noise performance in SN74ABT16240ADLRG4?

The SN74ABT16240ADLRG4 places four V_CC and eight GND pins across the package to minimize loop inductance and IR drop during simultaneous switching. This directly reduces ground bounce (V_OLP < 1 V) and crosstalk between adjacent channels - critical when all 16 outputs switch synchronously in memory address or data strobe applications.

What is the thermal resistance (θ_JA) of SN74ABT16240ADLRG4 in its SSOP (DL) package?

The SN74ABT16240ADLRG4 in the DL package has a specified junction-to-ambient thermal resistance (θ_JA) of 94°C/W under JEDEC-standard conditions. This value assumes a two-layer PCB with 1-in² copper pour per side; actual thermal performance improves with additional copper area, thermal vias, or airflow, and must be validated against worst-case power dissipation (e.g., 34 mA ICC at V_CC = 5.5 V).