Texas Instruments SN74LVCH16543ADGVR

Overview

SN74LVCH16543ADGVR from Texas Instruments is a 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between two 8-bit buses or as a unified 16-bit interface. It operates from 1.65 V to 3.6 V, supports 5.5-V-tolerant inputs, delivers 5.4 ns max propagation delay at 3.3 V, and features bus-hold circuitry and Ioff partial-power-down protection. It is used in mixed-voltage system interconnects such as FPGA-to-ASIC bridging and memory expansion interfaces.

For engineers reviewing the SN74LVCH16543ADGVR datasheet, SN74LVCH16543ADGVR pinout, SN74LVCH16543ADGVR application, or SN74LVCH16543ADGVR equivalent, key selection criteria include its dual 8-bit latch-enable and output-enable control per direction, 56-pin TVSOP (DGV) package, 3.3-V-compatible 5-V-tolerant I/O, and bus-hold functionality eliminating external biasing.

Technical Context

This device implements two independent 8-bit registered transceiver sections (A↔B), each with dedicated CE, LE, and OE controls enabling asynchronous, directionally isolated data latching and output gating. Its logic architecture supports transparent latch mode (LE low) followed by storage (LE rising edge) and high-impedance output control (OE high).

It integrates Ioff circuitry that disables outputs during power-down to prevent back-current, and bus-hold inputs that maintain valid logic states on floating A/B data lines without external resistors - both critical for hot-swap and low-power system design.

Key Specifications

Pinout & Package

SN74LVCH16543ADGVR uses a 56-pin Thin Very Small Outline Package (TVSOP, DGV), 6.1 mm × 11.2 mm body, 0.4 mm pitch, 1.2 mm max height, RoHS-compliant, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16543ADGGR, SN74LVCH16543ADGVR adds bus-hold and Ioff for plug-and-play mixed-voltage reliability; versus 74ALVCH16543DGGR, it trades 1.5 ns speed for broader 1.65–3.6 V operation and lower static power, making it optimal for flexible, low-risk system integration.

Availability

SN74LVCH16543ADGVR is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA-to-MCU bridges, and industrial PLC I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVCH16543ADGVR 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 and widebus architectures.

The SN74LVCH16543A belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for robust, mixed-voltage, high-speed data transfer in industrial, communications, and computing infrastructure.

FAQ

What is the maximum operating frequency supported by SN74LVCH16543ADGVR?

The SN74LVCH16543ADGVR does not specify a maximum clock frequency directly, but its 5.4 ns maximum propagation delay (tpd) at 3.3 V implies reliable operation up to approximately 185 MHz for single-cycle data transfer. Actual usable frequency depends on system-level timing margins, trace length, and load capacitance - design validation with worst-case tpd and setup/hold requirements is recommended for timing-critical applications using SN74LVCH16543ADGVR.

Does SN74LVCH16543ADGVR require external pullup or pulldown resistors on its data inputs?

No, SN74LVCH16543ADGVR includes active bus-hold circuitry on all A and B data inputs, which maintains valid logic states on unused or floating lines without external resistors. Using pullup or pulldown resistors with SN74LVCH16543ADGVR is explicitly discouraged in the datasheet, as it conflicts with the internal bus-hold current and may cause excessive power draw or logic contention.

Can SN74LVCH16543ADGVR be used in a system where the A-side runs at 5 V and the B-side at 3.3 V?

Yes - SN74LVCH16543ADGVR supports mixed-mode signal operation: its inputs tolerate up to 5.5 V regardless of VCC, and it operates from 1.65 V to 3.6 V. When powered at 3.3 V, SN74LVCH16543ADGVR safely accepts 5-V signals on A-side inputs and drives 3.3-V-compatible outputs on B-side, making it ideal for translating between 5-V legacy peripherals and 3.3-V logic domains.

What is the purpose of the Ioff feature in SN74LVCH16543ADGVR?

The Ioff feature in SN74LVCH16543ADGVR disables all outputs when VCC = 0 V, preventing current backflow from live bus lines into the unpowered device. This protects downstream components during partial power-down, hot-swap events, or mismatched power sequencing - a critical capability in modular systems where SN74LVCH16543ADGVR interfaces with independently powered subsystems.

How is the pinout of SN74LVCH16543ADGVR organized for bidirectional control?

SN74LVCH16543ADGVR features fully symmetrical, mirrored control signaling: pins 1–3 and 54–56 provide CEAB/LEAB/OEAB for A→B flow, while pins 27–29 and 32–34 provide CEBA/LEBA/OEBA for B→A flow. Each 8-bit data group (e.g., 1A1–1A8, 1B1–1B8) is spatially clustered and electrically isolated, enabling independent direction control - a layout optimized for clean PCB routing and minimized crosstalk in high-density designs using SN74LVCH16543ADGVR.