Texas Instruments SN74ABT16540ADLR

Overview

SN74ABT16540ADLR from Texas Instruments is an inverting 16-bit buffer/driver with dual 3-state output-enable control, designed for high-speed bus interface applications. It delivers –32-mA high-level and 64-mA low-level output drive, operates from 4.5 V to 5.5 V, and is rated for –40°C to 85°C industrial temperature range in a 48-pin SSOP (DL) package.

For engineers reviewing the SN74ABT16540ADLR datasheet, SN74ABT16540ADLR pinout, SN74ABT16540ADLR application, or SN74ABT16540ADLR equivalent, key selection criteria include its flow-through architecture for optimized PCB layout, distributed V_CC/GND pinning to suppress switching noise, latch-up immunity >500 mA per JESD-17, and guaranteed 3-state timing (t_PZH/t_PZL ≤ 5.2 ns at V_CC = 5 V).

Technical Context

This device implements two independent 8-bit inverting buffer sections, each with separate active-low 2-input AND-gated output-enable (OE1/OE2) logic - enabling selective 3-state control of either 8-bit bank. The high-drive BiCMOS EPIC-II^B process ensures fast propagation (t_PLH/t_PHL ≤ 4.2 ns) while maintaining low ground bounce (V_OLP < 1 V at V_CC = 5 V, T_A = 25°C).

Its distributed power/ground pin configuration minimizes simultaneous switching noise, and the flow-through pinout (inputs on one side, outputs on the opposite) eliminates layer jumps in dense PCB routing. Power-up/down robustness is supported by pull-up biasing of OE pins to V_CC, ensuring defined high-impedance state during supply transients.

Key Specifications

Pinout & Package

SN74ABT16540ADLR uses a 48-pin Shrink Small-Outline Package (SSOP, DL) with 0.025-inch pitch and 300-mil body width. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation; package meets JEDEC MO-153 standards and is RoHS-compliant with NiPdAu lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT16540ADLR, SN74ABT162244ADLR preserves logic polarity but shares identical thermal, timing, and layout behavior, while SN74LVC16244ADGGR reduces power and size at the cost of voltage compatibility and drive capability - making it unsuitable as a drop-in replacement in 5-V systems.

Availability

SN74ABT16540ADLR is available at Aetrix Electronics and suitable for industrial PLCs, test equipment pattern generators, backplane data interfaces, and legacy bus extenders requiring stable component supply, long-term lifecycle support, and consistent SSOP (DL) packaging.

Supply support for SN74ABT16540ADLR 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 heritage in high-reliability interface ICs.

The SN74ABT16540ADLR belongs to TI's Widebus™ family of high-speed bus interface devices, engineered specifically for robust, low-noise data transfer in industrial, computing, and instrumentation systems operating at 5 V.

FAQ

What is the logic function and polarity of SN74ABT16540ADLR?

The SN74ABT16540ADLR is an inverting 16-bit buffer/driver composed of two independent 8-bit sections. Each section inverts input signals (A → Y) and provides 3-state output control via dual active-low AND-gated enable inputs (OE1/OE2). This polarity supports standard bus signaling where inversion aligns with protocol requirements such as address/data strobing or complemented control lines. The SN74ABT16540ADLR maintains strict inverting behavior across its full operating range.

Does SN74ABT16540ADLR support 5-V TTL and CMOS logic families?

Yes, SN74ABT16540ADLR is fully compatible with 5-V TTL and CMOS logic families. Its recommended operating supply is 4.5 V to 5.5 V, input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) match standard TTL levels, and output voltages (V_OH ≥ 2.5 V at –24 mA, V_OL ≤ 0.55 V at 48 mA) meet or exceed TTL drive requirements. The SN74ABT16540ADLR also tolerates input voltages up to 7 V, supporting mixed-signal interfacing scenarios.

How is 3-state control implemented on SN74ABT16540ADLR?

SN74ABT16540ADLR implements 3-state control using two independent 2-input AND gates per 8-bit section - OE1 and OE2 are active-low inputs, so if either is high, all corresponding outputs go high-impedance. This design allows granular control: one bank can be enabled while the other remains tri-stated. To ensure safe high-Z during power-up, TI recommends tying OE pins to V_CC via a pull-up resistor sized per the driver's current-sinking capability - a key implementation detail for reliable SN74ABT16540ADLR system integration.

What package type and mounting specifications apply to SN74ABT16540ADLR?

SN74ABT16540ADLR is supplied in a 48-pin Shrink Small-Outline Package (SSOP, DL) with 300-mil body width and 0.025-inch pin pitch. It is RoHS-compliant with NiPdAu lead finish and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH). Tape-and-reel packaging uses 1000-unit reels with 32.0-mm reel width and Q1 pin-1 quadrant orientation. The SN74ABT16540ADLR footprint conforms to JEDEC MO-153 and is compatible with standard SMT reflow profiles.

Can SN74ABT16540ADLR replace older 74-series buffers like SN74LS640 in existing designs?

SN74ABT16540ADLR is not a direct functional or pinout replacement for SN74LS640 due to differences in logic function (inverting vs. non-inverting octal), pin count (48 vs. 20), and electrical characteristics (ABT drive strength vs. LS TTL). However, in new 16-bit bus designs requiring higher speed, lower noise, and greater drive, the SN74ABT16540ADLR offers superior performance: t_PLH ≤ 4.2 ns vs. ~25 ns for LS640, and 64-mA sink capability vs. ~8 mA. Migration requires PCB layout revision but delivers measurable SN74ABT16540ADLR system-level benefits.