Texas Instruments SN74LVTH16543DL

Overview

SN74LVTH16543DL from Texas Instruments is a 3.3-V ABT 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between 3.3-V logic and 5-V TTL systems. It supports independent A↔B register control via dual latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) inputs, features bus-hold on all data inputs, and operates across –40°C to 85°C. Used in backplane interfaces and mixed-voltage board interconnects.

For engineers reviewing the SN74LVTH16543DL datasheet, SN74LVTH16543DL pinout, SN74LVTH16543DL application, or SN74LVTH16543DL equivalent, this page delivers verified electrical specs, thermal performance (θJA = 74°C/W), hot-insertion support via Ioff and power-up 3-state, bus-hold functionality, and precise DL-package mechanical data - all confirmed for the exact SSOP-56 variant.

Technical Context

This device implements two independent 8-bit registered transceiver sections, each with separate CE/LE/OE controls enabling flexible half-duplex or full-duplex operation. Its Advanced BiCMOS Technology (ABT) ensures low static power at 3.3 V while tolerating 5-V inputs and outputs.

It provides true hot-insertion capability through Ioff protection (±100 µA at VCC = 0) and power-up 3-state behavior, preventing bus contention during power sequencing. Bus-hold circuitry eliminates external pull resistors by maintaining valid logic levels on floating A/B inputs.

Key Specifications

Pinout & Package

SN74LVTH16543DL uses a 56-pin Shrink Small-Outline Package (SSOP-DL), 13.9 mm × 7.9 mm × 1.2 mm max height, with 0.5-mm lead pitch and pin 1 identifier in top-left corner per JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH16543DL, SN74LVT16543DGGR trades thermal performance for compactness, while SN74LVCH16543DGGR sacrifices 5-V tolerance and bus-hold to reduce static current - making SN74LVTH16543DL the sole option for robust mixed-voltage hot-swap interconnects.

Availability

SN74LVTH16543DL is available at Aetrix Electronics and suitable for industrial backplanes, legacy system upgrades, hot-swappable modules, and high-density memory expansion buses requiring stable component supply and long-term lifecycle continuity.

Supply support for SN74LVTH16543DL 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 delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVTH16543DL belongs to TI's Widebus™ family of advanced bus-interface ICs, engineered specifically for high-speed, mixed-voltage board-level interconnects in demanding industrial and telecom infrastructure.

FAQ

What is the maximum operating voltage for SN74LVTH16543DL?

The absolute maximum supply voltage for SN74LVTH16543DL is 4.6 V, but its recommended operating range is strictly 2.7 V to 3.6 V. Exceeding 3.6 V risks violating the ABT process design limits and may cause accelerated parametric drift or latch-up. All DC and AC specifications in the datasheet are validated within the 2.7–3.6 V window, including IOL, VOL, and timing parameters. SN74LVTH16543DL must not be operated continuously above 3.6 V.

Does SN74LVTH16543DL support 5-V input tolerance on all pins?

Yes, SN74LVTH16543DL supports 5-V input tolerance on all A- and B-port data inputs and control inputs (LE, OE, CE), with VI rated up to 5.5 V per recommended conditions and 7 V under absolute maximum ratings. This allows direct connection to 5-V TTL outputs without external clamping. However, VCC must remain within 2.7–3.6 V, and output drive remains 3.3-V referenced - though VOH/VOL meet TTL thresholds for 5-V system compatibility.

How does bus-hold functionality work on SN74LVTH16543DL?

SN74LVTH16543DL integrates active bus-hold circuitry on all A- and B-port inputs, drawing ±75 µA at VI = 2 V to maintain the last-valid logic state when inputs float. This eliminates the need for external 10-kΩ pullup/pulldown resistors, reducing BOM cost and PCB real estate. Bus-hold activates automatically - no configuration or enable signal is required - and operates across the full –40°C to +85°C temperature range.

Can SN74LVTH16543DL be used in hot-swap applications?

Yes, SN74LVTH16543DL is explicitly characterized for hot-insertion use via two integrated protections: Ioff limits current to ±100 µA when VCC = 0, preventing backdrive damage during live insertion; and power-up 3-state forces outputs into high-impedance during power ramping (0–1.5 V), avoiding bus contention. These features are production-tested per JEDEC JESD78 and documented in the SCBS699D datasheet.

What is the thermal performance difference between SN74LVTH16543DL and SN74LVTH16543DGGR?

SN74LVTH16543DL (SSOP-DL) has θJA = 74°C/W, while SN74LVTH16543DGGR (TSSOP-DGG) has θJA = 81°C/W - a 7°C/W advantage for the DL package under identical PCB conditions. This translates to ~1.4°C lower junction temperature at 100 mW dissipation. The DL package's larger body (13.9 × 7.9 mm vs. 12.5 × 6.1 mm) and thicker mold compound contribute to improved heat spreading, making SN74LVTH16543DL preferable in thermally constrained industrial enclosures.