Nexperia USA Inc. 74LVT16543ADL,512

Overview

74LVT16543ADL,512 from Nexperia is a 3.3 V 16-bit registered transceiver with 3-state outputs, designed for bidirectional data bus interfacing between asynchronous or clocked subsystems. It supports dual 8-bit or single 16-bit operation, features bus-hold inputs eliminating external pull-ups, and delivers ±64 mA output drive at 3.3 V supply. Used in industrial backplane interfaces and FPGA-to-ASIC interconnects requiring latch-controlled data flow.

For engineers reviewing the 74LVT16543ADL,512 datasheet, 74LVT16543ADL,512 pinout, 74LVT16543ADL,512 application, or 74LVT16543ADL,512 equivalent, key selection criteria include transparent/latched mode timing (tpd ≤ 3.7 ns @ 3.3 V), overvoltage-tolerant 5.5 V inputs, IOFF power-down protection, and TSSOP56 package thermal performance across –40 °C to +85 °C.

Technical Context

The device implements two independent 8-bit register-controlled transceiver channels (A↔B), each with separate enable (nEAB/nEBA), latch (nLEAB/nLEBA), and output-enable (nOEAB/nOEBA) controls. Data flows transparently when enable and latch are LOW; a LOW-to-HIGH nLEAB/nLEBA edge latches inputs, freezing outputs until next latch event.

Bus-hold circuitry maintains stable logic states on unused I/O pins without external resistors, while IOFF functionality disables all outputs during power-down to prevent current backflow. Input tolerance to 5.5 V and compatibility with 5 V TTL systems enable mixed-voltage board-level interfacing.

Key Specifications

Pinout & Package

TSSOP56 (SOT364-1) package: plastic thin shrink small outline, 56 leads, 6.1 mm body width, 0.5 mm lead pitch, 1.2 mm max height - optimized for high-density PCB layouts with improved thermal dissipation vs. SSOP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16543DGGR and 74ALVCH16543T, the 74LVT16543ADL,512 uniquely combines 5.5 V input tolerance, IOFF protection, and bus-hold-making it the only option qualified for mixed-voltage, hot-pluggable industrial backplanes requiring zero external bias components.

Availability

74LVT16543ADL,512 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA-to-ASIC interconnects, and legacy system upgrade bridges requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVT16543ADL,512 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

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, reliability, and sustainability in industrial, automotive, and computing markets.

The 74LVT series targets high-speed, mixed-voltage digital interfacing applications-designed specifically for robust operation in noisy industrial environments where bus integrity, voltage translation, and power sequencing resilience are critical.

FAQ

What is the maximum clock rate supported by the 74LVT16543ADL,512 in transparent mode?

The device does not operate on a clock signal-it uses asynchronous control inputs (nLEAB/nLEBA). In transparent mode, its 3.7 ns maximum propagation delay (tpd) supports reliable data handshaking up to approximately 250 MHz effective toggle rate, assuming proper PCB layout and load capacitance ≤ 50 pF per pin.

Can the 74LVT16543ADL,512 safely interface a 3.3 V FPGA with a 5 V microcontroller bus?

Yes-the inputs tolerate up to 5.5 V regardless of VCC, and outputs swing rail-to-rail within the 3.3 V supply range. The 5 V microcontroller sees valid TTL-compatible HIGH/LOW levels, while the FPGA receives clean 3.3 V logic. No level shifter is required, but ensure nOE/nE control signals are driven from 3.3 V sources.

How does bus-hold functionality affect power consumption during idle periods?

Bus-hold draws ±75–140 μA per active input pin at 3.0 V, adding negligible quiescent current (typically < 2 mA total for all 32 I/Os). This is far less than the 10–100 kΩ external pull-up resistors it replaces, which would draw 0.3–0.5 mA per resistor at 3.3 V-making bus-hold net power-negative in most implementations.

Is the TSSOP56 package suitable for reflow soldering in high-volume manufacturing?

Yes-SOT364-1 (TSSOP56) is qualified for standard lead-free reflow profiles (J-STD-020). Its 0.5 mm pitch and exposed thermal pad (not present in this variant) support automated optical inspection and consistent solder joint formation. Thermal resistance (RθJA ≈ 50 °C/W) enables operation at full rating up to +85 °C ambient with standard 2-layer PCB copper pour.