Texas Instruments 74LVTH16543DGGRE4

Overview

74LVTH16543DGGRE4 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 systems. It features dual 8-bit registers, independent A↔B latch-enable and output-enable controls, bus-hold on all data inputs, and Ioff support for hot insertion. Used in mixed-voltage backplane interfaces and memory expansion subsystems.

For engineers reviewing the 74LVTH16543DGGRE4 datasheet, 74LVTH16543DGGRE4 pinout, 74LVTH16543DGGRE4 application, or 74LVTH16543DGGRE4 equivalent, this device delivers TTL-compatible 5-V input tolerance, 2.7–3.6-V supply operation, sub-4-ns propagation delay at 3.3 V, and guaranteed hot-plug safety via power-up 3-state and Ioff circuitry.

Technical Context

The 74LVTH16543DGGRE4 implements two independent 8-bit registered transceiver sections (A↔B), each with dedicated CE, LE, and OE control inputs enabling precise direction and timing control. Its Advanced BiCMOS Technology (ABT) ensures low static power and high noise immunity while supporting mixed-mode signaling - 5-V-tolerant inputs with 3.3-V VCC.

It integrates bus-hold circuitry to maintain valid logic levels on floating data lines, eliminating external pull resistors. The distributed VCC/GND pin layout and flow-through architecture reduce switching noise and simplify PCB routing, critical for high-density 56-pin TSSOP layouts.

Key Specifications

Pinout & Package

74LVTH16543DGGRE4 uses a 56-pin Thin Shrink Small-Outline Package (TSSOP-DGG), 13.9 mm × 7.9 mm × 1.2 mm max height, with 0.5-mm pitch and Q1 pin-1 orientation per JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH16245DGGR, 74LVTH16543DGGRE4 provides essential register synchronization for setup/hold-critical interfaces; versus SN74ALVTH16543DGGR, it trades speed for broader 5-V interoperability and industrial temperature margin.

Availability

74LVTH16543DGGRE4 is available at Aetrix Electronics and suitable for industrial backplanes, memory expansion modules, hot-swappable I/O cards, and PLC communication subsystems requiring stable component supply across extended product lifecycles.

Supply support for 74LVTH16543DGGRE4 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 focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and communications markets with high-reliability silicon solutions.

The LVTH family delivers 3.3-V ABT logic with mixed-voltage interoperability and robust hot-plug capability - engineered specifically for upgrading legacy 5-V systems while preserving signal integrity and power efficiency.

FAQ

What is the maximum input voltage rating for 74LVTH16543DGGRE4?

The 74LVTH16543DGGRE4 supports input voltages up to 5.5 V, enabling direct connection to 5-V TTL buses without external level-shifting circuitry. This 5-V tolerance applies across the full recommended operating temperature range (–40°C to +85°C) and is specified under absolute maximum ratings with VI ≤ 7 V. The device maintains correct logic interpretation and does not require clamping diodes or series resistors for 5-V inputs when VCC is 2.7–3.6 V.

Does 74LVTH16543DGGRE4 support hot insertion?

Yes, 74LVTH16543DGGRE4 fully supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0, preventing damaging back-current, and power-up 3-state forces outputs into high-impedance during power ramp (0–1.5 V). These features are verified per JESD78 and meet MIL-STD-883 requirements, making 74LVTH16543DGGRE4 suitable for live-backplane and modular chassis applications.

How many independent transceiver sections does 74LVTH16543DGGRE4 contain?

The 74LVTH16543DGGRE4 contains two independent 8-bit registered transceiver sections: Section 1 (pins A1–A8/B1–B8) and Section 2 (pins A1–A8/B1–B8, second set). Each section has dedicated CEAB/CEBA, LEAB/LEBA, and OEAB/OEBA controls, allowing asynchronous operation - for example, latching data in one direction while outputting in the other.

What is the purpose of bus-hold circuitry in 74LVTH16543DGGRE4?

The bus-hold circuitry in 74LVTH16543DGGRE4 actively maintains unused or floating data inputs (all 32 A/B pins) at their last-valid logic state using ±75 µA hold current. This eliminates the need for 32 external pullup or pulldown resistors, reducing BOM cost, PCB area, and potential noise coupling - especially valuable in high-pin-count, space-constrained industrial modules where trace stubs may cause reflections.

What package type and dimensions does 74LVTH16543DGGRE4 use?

74LVTH16543DGGRE4 uses a 56-pin Thin Shrink Small-Outline Package (TSSOP-DGG) per JEDEC MO-153, measuring 13.9 mm × 7.9 mm × 1.2 mm max height with 0.5-mm lead pitch. Pin 1 is located in Quadrant Q1; the package features 8 VCC and 8 GND pins distributed for low-noise power delivery. Thermal resistance θJA is 81°C/W, validated for industrial ambient conditions.