Nexperia USA Inc. 74ALVCH16646DGG,11

Overview

74ALVCH16646DGG,11 from Nexperia is a 16-bit non-inverting bus transceiver/register with 3-state outputs, dual D-type flip-flop registers per port, and multiplexed real-time/registered data routing. It operates from 2.3 V to 3.6 V, delivers ±24 mA output drive at 3.0 V, supports −40 °C to +85 °C ambient, and enables bidirectional data flow between A and B buses in systems requiring buffered, registered bus interfacing - such as memory expansion interfaces in industrial controllers.

For engineers reviewing the 74ALVCH16646DGG,11 datasheet, 74ALVCH16646DGG,11 pinout, 74ALVCH16646DGG,11 application, or 74ALVCH16646DGG,11 equivalent, this device is selected for high-speed, low-voltage bidirectional bus isolation with simultaneous register storage, transparent mode operation, and bus-hold on all data inputs - critical for noise-immune backplane and modular I/O subsystem design.

Technical Context

The device integrates two independent 8-bit transceiver/register sections (Section 1 and Section 2), each with dedicated direction (nDIR), output enable (nOE), clock (nCPAB/nCPBA), and select (nSAB/nSBA) controls. Each section supports both real-time (transparent) and registered (clocked) data transfer paths between A and B ports.

Its dual-register architecture allows concurrent capture of A- and B-bus data on separate clock edges, while bus-hold circuitry maintains valid logic levels on floating inputs without external pull-ups. The TSSOP56 package provides low-inductance multiple VCC/GND pins to suppress ground bounce in high-speed switching environments.

Key Specifications

Pinout & Package

TSSOP56 plastic thin shrink small outline package (SOT364-1), 56-pin, body width 6.1 mm, with 4× VCC and 8× GND pins for low-noise power distribution.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16646GR and 74LVC16646ADGG,11, the 74ALVCH16646DGG,11 uniquely combines bus-hold, ultra-low ICC (≤40 μA), and full 2.3–3.6 V operation in a pin-compatible TSSOP56 package - making it the sole option for industrial backplanes with uncontrolled input states and wide-input-voltage requirements.

Availability

74ALVCH16646DGG,11 is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular I/O expansion, memory-mapped peripheral bridging, and test access port multiplexing requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74ALVCH16646DGG,11 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 logic, discrete, and MOSFET solutions optimized for efficiency, miniaturization, and robustness in industrial, automotive, and consumer applications.

The 74ALVCH16646 belongs to Nexperia's advanced ALVCH logic family, designed specifically for high-speed, low-voltage bidirectional bus interfacing in noise-sensitive industrial control and communications infrastructure where signal integrity and power efficiency are critical.

FAQ

What is the minimum recommended pull-up resistor value for nOE during power-up?

The datasheet specifies that nOE should be tied to VCC via a pull-up resistor to ensure high-impedance state at power-up. Minimum resistance is determined by the driver's current-sinking capability - for typical 2.3–3.6 V operation, a 10 kΩ resistor suffices, as nOE input leakage is ≤5 μA and the pin sinks <100 μA in active-LOW state. Values below 4.7 kΩ are unnecessary and increase quiescent current.

Can both A→B and B→A registered transfers occur simultaneously?

Yes - the device contains two fully independent 8-bit sections (Section 1 and Section 2), each with dedicated CPAB/CPBA, SAB/SBA, DIR, and OE controls. While one section clocks A→B data on nCPAB, the other can simultaneously clock B→A data on its own nCPBA, enabling full-duplex registered data movement without conflict.

Does bus-hold functionality remain active when VCC is below 2.3 V?

No - bus-hold circuitry is specified only within the recommended operating range (2.3 V to 3.6 V). Below 2.3 V, bus-hold current drops significantly (e.g., IBHL falls to ±45 μA at VCC = 2.3 V, and is not characterized lower), and the device may fail to maintain valid logic levels on floating inputs. Operation outside 2.3–3.6 V violates recommended conditions.

How does the device behave when nOE is HIGH and nDIR is toggled?

When nOE = HIGH (isolation mode), outputs are high-impedance, but all inputs remain fully functional. Toggling nDIR has no effect on output state, but does affect which bus (A or B) receives data when nOE later goes LOW - the last nDIR state is latched and determines direction upon enable, ensuring glitch-free bus arbitration during reactivation.