Texas Instruments SN74ALVCH16543DLR

Overview

SN74ALVCH16543DLR 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 single 16-bit transceiver. It operates from 1.65 V to 3.6 V, features bus-hold circuitry on all data inputs, and supports independent A-to-B and B-to-A control via dedicated latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) pins. It is used in high-density logic interfacing, memory expansion, and bus isolation in industrial control systems.

For engineers reviewing the SN74ALVCH16543DLR datasheet, SN74ALVCH16543DLR pinout, SN74ALVCH16543DLR application, or SN74ALVCH16543DLR equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), dual 8-bit register independence, bus-hold functionality eliminating external resistors, 3-state output drive capability (±24 mA at 3 V), and SSOP-56 package thermal performance (θ_JA = 74°C/W).

Technical Context

This device implements two independent 8-bit registered transceiver sections-A-to-B and B-to-A-each with separate CE (chip enable), LE (latch enable), and OE (output enable) controls. Data latching occurs on low-to-high transitions of LE while CE is asserted low, enabling transparent or storage modes per section.

It uses TI's EPIC™ submicron CMOS process and integrates bus-hold circuitry on all A and B port inputs, maintaining valid logic levels without external pullup/pulldown resistors. The 3-state outputs support hot-swap compatibility and bus contention avoidance, with guaranteed high-impedance state during power-up/down when OE is tied to V_CC via pullup.

Key Specifications

Pinout & Package

SSOP-56 (DL) package: 56-pin shrink small-outline plastic package, 300-mil body width, 0.5-mm lead pitch, 1.2-mm max height, JEDEC MO-153 compliant. Thermal resistance θ_JA = 74°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCH16543DLR and 74ALVCH162245DLR, the SN74ALVCH16543DLR uniquely provides both high-drive registered transfer and full bus-hold integration in SSOP-56, making it optimal for industrial bus isolation requiring deterministic timing and floating-input resilience.

Availability

SN74ALVCH16543DLR is available at Aetrix Electronics and suitable for industrial control systems, memory expansion modules, and programmable logic interconnect requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74ALVCH16543DLR 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 SN74ALVCH16543DLR belongs to TI's Widebus™ family of advanced logic devices, engineered specifically for high-speed, low-voltage bidirectional bus interfacing in industrial and computing infrastructure.

FAQ

What is the recommended power-up sequence for SN74ALVCH16543DLR to avoid bus contention?

TI specifies that OE inputs must be held high (via pullup to V_CC) during power-up and power-down to guarantee 3-state outputs. For SN74ALVCH16543DLR, tie all four OE pins (1OEAB, 2OEAB, 1OEBA, 2OEBA) to V_CC through ≥10-kΩ resistors. This ensures high-impedance outputs until system firmware asserts OE low, preventing unintended drive onto shared buses.

Does SN74ALVCH16543DLR support mixed-voltage operation between its A and B ports?

No - SN74ALVCH16543DLR has a single V_CC pin supplying both A and B I/O sections. All inputs and outputs operate referenced to the same V_CC rail (1.65–3.6 V). It does not provide internal level shifting; external translators are required for true mixed-voltage A/B interfacing.

Can SN74ALVCH16543DLR be used as a 16-bit unidirectional transceiver?

Yes - SN74ALVCH16543DLR can operate as a 16-bit unidirectional transceiver by tying one set of CE/LE/OE inputs inactive (e.g., hold CEBA high) and using only the A-to-B path (CEAB/LEAB/OEAB) or only the B-to-A path (CEBA/LEBA/OEBA), effectively configuring it as a 16-bit latch+driver or buffer.

What is the maximum capacitive load SN74ALVCH16543DLR can drive while maintaining specified timing?

TI characterizes SN74ALVCH16543DLR timing (e.g., t_pd, t_en) with C_L = 30 pF (Figures 1–2) and 50 pF (Figure 3). For reliable operation within datasheet limits, keep total load capacitance ≤50 pF per output. Exceeding this increases propagation delay and may violate setup/hold windows in high-speed systems.

Is bus-hold functionality enabled by default on SN74ALVCH16543DLR, and can it be disabled?

Yes - bus-hold is permanently integrated on all A and B port inputs of SN74ALVCH16543DLR and cannot be disabled. It actively maintains last-valid logic state when inputs float, drawing ±75 µA at 3 V. No external configuration or control is required or supported.