Texas Instruments SN74ABT16543DGGR

Overview

SN74ABT16543DGGR from Texas Instruments is a 16-bit registered transceiver with dual 3-state outputs, designed for bidirectional data flow between two 16-bit buses. It features independent A-to-B and B-to-A latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, ±32-mA high-drive outputs, and operates at 4.5–5.5 V over –40°C to 85°C. It is used in high-speed bus interface applications such as memory expansion and backplane data routing.

For engineers reviewing the SN74ABT16543DGGR datasheet, SN74ABT16543DGGR pinout, SN74ABT16543DGGR application, or SN74ABT16543DGGR equivalent, key selection considerations include its 56-pin TSSOP (DGG) package, flow-through architecture for optimized PCB layout, latch-controlled bidirectional data registration, and compatibility with 5-V TTL-level systems requiring robust noise immunity and ground-bounce suppression.

Technical Context

The SN74ABT16543DGGR implements two independent 8-bit registered transceiver sections-each with dedicated CE, LE, and OE inputs-enabling flexible half-duplex or full-duplex operation. Its EPIC-II^B BiCMOS process delivers low power dissipation while supporting high-speed switching with typical VOLP < 1 V at 5 V and 25°C.

It uses distributed V_CC/GND pinning to minimize simultaneous switching noise, and its flow-through pinout (A-side pins on one side, B-side on the opposite) eliminates layer crossings in dense PCB layouts. Latch transparency and storage modes are controlled by low-to-high LE transitions, with 3-state outputs disabled when OE is high.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm × 1.2 mm body, 0.5-mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar registered transceiver applications.

Compared with SN74ABT16543DLR and SN74LVTH16543DGGR, the SN74ABT16543DGGR uniquely balances 5-V TTL compatibility, high drive strength, and compact TSSOP packaging-making it optimal for space-constrained industrial bus interfaces requiring robust noise immunity and precise timing control.

Availability

SN74ABT16543DGGR is available at Aetrix Electronics and suitable for memory expansion interfaces, backplane routing systems, and processor-peripheral bridging applications requiring stable component supply across extended production lifecycles.

Supply support for SN74ABT16543DGGR 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 ICs.

The SN74ABT16543DGGR belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for high-speed, low-noise 16-bit data transfer in industrial computing and communications infrastructure.

FAQ

What is the recommended power-up sequence for SN74ABT16543DGGR to ensure high-impedance outputs?

TI specifies that OE inputs must be held high (via pullup resistors to V_CC) during power-up and power-down to guarantee 3-state outputs. For SN74ABT16543DGGR, use ≥10-kΩ pullups on all four OE pins (1OEAB, 2OEAB, 1OEBA, 2OEBA). This prevents bus contention before system initialization completes. The SN74ABT16543DGGR does not include internal power-on reset circuitry, so external control of OE is mandatory for safe startup.

Can SN74ABT16543DGGR operate reliably at 4.5 V supply with full timing specifications met?

Yes. Per the recommended operating conditions table, SN74ABT16543DGGR is fully specified from 4.5 V to 5.5 V across –40°C to +85°C. All timing parameters-including t_PLH, t_PHL, and setup/hold times-are guaranteed at V_CC = 4.5 V. The SN74ABT16543DGGR maintains –32-mA I_OH and +64-mA I_OL drive even at minimum supply, ensuring robust performance in brown-out scenarios.

How does the flow-through pinout of SN74ABT16543DGGR improve PCB layout compared to traditional transceivers?

The SN74ABT16543DGGR places all A-port signals (A1–A16) on the left side and all B-port signals (B1–B16) on the right side of the 56-pin TSSOP package. This flow-through arrangement allows straight trace routing without layer jumps or vias between bus segments-reducing parasitic inductance, improving signal integrity, and cutting layout time. Unlike center-fed packages, the SN74ABT16543DGGR eliminates stubs and impedance discontinuities common in dense backplane designs.

Is SN74ABT16543DGGR pin-compatible with SN74ABT16543DL or SN74ABT16543DLR?

No. Although SN74ABT16543DGGR, SN74ABT16543DL, and SN74ABT16543DLR share identical logic functionality and pin numbering, they use different packages: DGG (TSSOP-56), DL (SSOP-56), and DLR (SSOP-56 tape-and-reel). While pin 1 location and signal mapping match, the physical dimensions, pitch (0.5 mm vs. 0.635 mm), and land patterns differ. Direct replacement requires PCB redesign; SN74ABT16543DGGR cannot be soldered onto an SSOP footprint.

What is the maximum capacitive load SN74ABT16543DGGR can drive while maintaining specified timing?

The SN74ABT16543DGGR switching characteristics are characterized at C_L = 50 pF. Driving loads beyond this increases propagation delay nonlinearly-e.g., t_PLH rises from 1.0 ns (min) to ~6 ns at 100 pF. For timing-critical applications, keep total load ≤50 pF per output (including trace, via, and input capacitance). If higher capacitance is unavoidable, derate timing margins using TI's delay vs. C_L curves in the SN74ABT16543DGGR datasheet Figure 7.