Texas Instruments SN74ABT16640DLR

Overview

SN74ABT16640DLR from Texas Instruments is an inverting 16-bit bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in high-speed digital systems. It supports dual 8-bit or single 16-bit operation, features ±32-mA/±64-mA drive strength (IOH/IOL), operates at 4.5–5.5 V, and is rated for –40°C to 85°C industrial temperature range.

For engineers reviewing the SN74ABT16640DLR datasheet, SN74ABT16640DLR pinout, SN74ABT16640DLR application, or SN74ABT16640DLR equivalent, key selection criteria include direction-control logic (1DIR/2DIR), output-enable timing (tPZH/tPLZ ≤ 5.5 ns), flow-through pinout for PCB layout optimization, and compatibility with 5-V TTL/CMOS bus interfaces in backplane, memory expansion, and processor peripheral interconnects.

Technical Context

This device implements two independent 8-bit inverting transceiver sections, each with dedicated direction (DIR) and output-enable (OE) controls. Logic operation is defined by a function table where OE = L enables bidirectional transfer (DIR = L routes B→A; DIR = H routes A→B), while OE = H forces all outputs into high-impedance isolation.

It uses EPIC-II^B BiCMOS process technology to achieve low ground bounce (VOLP < 1 V), distributed V_CC/GND pins to suppress switching noise, and flow-through architecture-inputs on one side, outputs on the opposite-to minimize trace crossovers and signal integrity degradation in dense PCB layouts.

Key Specifications

Pinout & Package

SN74ABT16640DLR is housed in a 48-pin plastic shrink small-outline package (SSOP-DL), 300-mil body width, 0.5-mm lead pitch, 1.2-mm max height, JEDEC MO-153 compliant. Pin 1 located at top-left corner with notch or dot marking; leads are gull-wing, NIPDAU-finished, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit inverting bus transceiver applications.

Compared with SN74ABT16640DLR, SN74ABT16245DLR preserves data polarity at identical speed and drive, while SN74LVC16T245DGGR adds voltage flexibility at the cost of timing margin and output strength - making the original optimal for high-speed, fixed 5-V industrial backplanes.

Availability

SN74ABT16640DLR is available at Aetrix Electronics and suitable for backplane routing, memory expansion interfaces, processor peripheral bridging, and industrial I/O module bus applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for SN74ABT16640DLR 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 for industrial and communications markets.

The ABT logic family-including SN74ABT16640DLR-is engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial control, test equipment, and telecom infrastructure applications.

FAQ

What is the recommended power-up sequence for SN74ABT16640DLR to avoid bus contention?

TI specifies that OE inputs must be held high (via pullup to VCC) during power-up to guarantee high-impedance outputs before internal logic stabilizes. For SN74ABT16640DLR, use a ≥10-kΩ pullup resistor on each 1OE and 2OE pin; this ensures isolation until system firmware asserts valid DIR/OE states, preventing back-driving of live buses or latch-up risk.

Does SN74ABT16640DLR support hot-swap operation in live backplane systems?

SN74ABT16640DLR provides inherent hot-swap readiness through its high-impedance default state when OE is inactive and robust latch-up immunity (>500 mA per JESD-17). However, full hot-swap compliance requires external circuitry - such as current-limiting resistors and slew-rate controlled enable sequencing - to manage inrush and transient coupling during card insertion into a powered backplane.

Can SN74ABT16640DLR be used in non-inverting mode?

No - SN74ABT16640DLR is inherently inverting: data appearing on A-side outputs is the logical complement of B-side inputs (and vice versa). To achieve non-inverting behavior, pair it with external inverters or select SN74ABT16245DLR, which shares identical package, timing, and drive specs but implements true non-inverting transfer logic.

What PCB layout practices maximize signal integrity for SN74ABT16640DLR at 100+ MHz?

Follow TI's flow-through layout guidance: route A- and B-bus traces orthogonally across the package, place 0.1-µF ceramic decoupling caps within 3 mm of each VCC pin, use solid ground planes beneath signal layers, and maintain controlled impedance (50 Ω) for traces longer than 2 inches. Avoid stubs >5 mm to prevent reflections at tPLH < 4.3 ns edge rates.

Is SN74ABT16640DLR RoHS compliant and lead-free?

Yes - SN74ABT16640DLR is RoHS-compliant with NIPDAU (nickel/palladium/gold) lead finish, MSL Level-1 rating, and fully compatible with lead-free reflow profiles up to 260°C peak temperature. The SSOP-DL package contains no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE per EU Directive 2011/65/EU.