Nexperia USA Inc. 74ALVCH16500DGG:11

Overview

74ALVCH16500DGG:11 from Nexperia is an 18-bit universal bus transceiver with bidirectional data flow control, bus hold inputs, and 3-state outputs. It supports A↔B data transfer via independent OE/LE/CP controls (OEAB active HIGH, OEBA active LOW), operates from 1.65 V to 3.6 V, features IOFF partial power-down protection, and is rated for -40 °C to +85 °C - used in high-density memory expansion and multi-processor interconnects.

For engineers reviewing the 74ALVCH16500DGG:11 datasheet, 74ALVCH16500DGG:11 pinout, 74ALVCH16500DGG:11 application, or 74ALVCH16500DGG:11 equivalent, key selection criteria include dual-direction latch/clock enable timing, bus hold current specs (IBHL/IBHH), IOFF-enabled system power sequencing, and TSSOP56 thermal/power integrity under 24 mA drive at 3.0 V.

Technical Context

This device implements two independent 18-bit data paths (A-to-B and B-to-A) with separate output enables (OEAB/OEBA), latch enables (LEAB/LEBA), and clocks (CPAB/CPBA). Its bus hold circuit maintains valid logic states on floating inputs without external pull-ups, reducing board space and signal integrity risk.

IOFF functionality disables outputs during power-down by cutting off internal conduction paths, preventing backflow current when VCC = 0 V while other rails remain active - critical for hot-swap and mixed-voltage domain systems.

Key Specifications

Pinout & Package

TSSOP56 (SOT364-1) package: plastic thin shrink small outline, 56 leads, 6.1 mm body width, 0.5 mm pitch, 1.2 mm max height - optimized for automated SMT assembly and thermal dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16500DGGR, the 74ALVCH16500DGG:11 offers lower quiescent current and superior bus hold stability; versus 74LVC16500ADGG, it adds essential IOFF and bus hold for robust industrial power sequencing - making it the sole choice for partial-power-down reliability.

Availability

74ALVCH16500DGG:11 is available at Aetrix Electronics and suitable for memory expansion interfaces, multi-processor data bridges, and hot-swappable backplane modules requiring stable component supply across extended temperature and mixed-voltage operation.

Supply support for 74ALVCH16500DGG: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 components for automotive, industrial, and consumer electronics - with leadership in logic, power MOSFETs, and ESD protection.

The 74ALVCH series targets high-speed, low-voltage logic interfacing in space-constrained industrial systems, emphasizing robustness across voltage domains and power states.

FAQ

What is the purpose of the complementary OEAB (active HIGH) and OEBA (active LOW) inputs?

The complementary output enable polarity allows direct connection to standard bus arbitration logic: OEAB ties to a single enable signal for A→B writes, while OEBA connects to its inverted version for B→A reads - eliminating external inverters and reducing gate count in control CPLDs.

How does the bus hold feature eliminate external pull-up resistors?

Internal weak keepers (IBHL = 75–150 μA at 0.8 V, IBHH = −75–−175 μA at 2.0 V) actively maintain valid logic states on un-driven A/B pins - sufficient to override typical PCB leakage (<1 μA) and noise margins, removing need for 10 kΩ discrete resistors on all 36 I/O lines.

Can the 74ALVCH16500DGG:11 operate safely when only one VCC rail is powered?

Yes - the IOFF circuit detects VCC = 0 V and forces all outputs into high-impedance, blocking current flow from live B-side signals into the unpowered A-side domain. This meets JESD78 Class II latch-up immunity and prevents damage during staggered power sequencing.

What is the significance of MULTIBYTE™ flow-through pinout in PCB layout?

The interleaved A0/B0, A1/B1, ..., A17/B17 arrangement minimizes adjacent signal crosstalk and allows straight-through trace routing without layer swaps - reducing differential skew to <100 ps across the 18-bit bus and improving timing closure in high-speed parallel interfaces.