Nexperia USA Inc. 74ALVCH16500DGG512

Overview

74ALVCH16500DGG512 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, operates from 1.65 V to 3.6 V, features IOFF for partial power-down protection, and is rated for -40 °C to +85 °C industrial operation - used in high-density memory interface and backplane buffer applications.

For engineers reviewing the 74ALVCH16500DGG512 datasheet, 74ALVCH16500DGG512 pinout, 74ALVCH16500DGG512 application, or 74ALVCH16500DGG512 equivalent, key selection criteria include dual-direction latch/clock enable timing, bus hold current specs (±75 μA at 3.0 V), IOFF-enabled hot-swap capability, and TSSOP56 package compatibility with 0.5 mm pitch PCB layouts.

Technical Context

This device implements two independent 18-bit data paths (A-to-B and B-to-A) with separate output enables (OEAB active HIGH, OEBA active LOW), latch enables (LEAB/LEBA active HIGH), and clocks (CPAB/CPBA active LOW). Each path supports transparent, latched, and clocked data transfer modes per JEDEC JESD8-7/8-5/36 compliance.

Bus hold circuitry maintains valid logic states on all 36 I/O pins without external pull-ups; IOFF disables outputs during power-down to prevent backflow current. Propagation delays range from 1.0 ns to 5.5 ns depending on VCC and signal path, with maximum toggle frequency up to 340 MHz at 3.3 V.

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 PCBs with thermal and EMI performance via multiple VCC/GND pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit universal bus transceiver applications.

Compared with SN74ALVTH16500DGGR and 74LVC16500ADGG, the 74ALVCH16500DGG512 uniquely combines IOFF, bus hold, and JEDEC-compliant ESD in a single 1.65–3.6 V device - making it optimal for hot-swap-capable industrial backplanes requiring zero external biasing.

Availability

74ALVCH16500DGG512 is available at Aetrix Electronics and suitable for memory interface buffering, FPGA I/O expansion, modular backplane interconnect, and industrial PLC I/O subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVCH16500DGG512 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 applications - with leadership in logic, MOSFETs, diodes, and ESD protection.

The 74ALVCH16500 belongs to Nexperia's advanced ALVCH logic family, designed specifically for high-speed, low-power, hot-swap-capable bus interfacing in industrial and communications infrastructure equipment.

FAQ

What is the purpose of the IOFF feature in the 74ALVCH16500DGG512?

The IOFF (power-off protection) circuitry disables all outputs when VCC = 0 V, preventing damaging backflow current from live buses into the unpowered device. This enables safe hot-plug operation in modular systems like telecom backplanes or server blades where individual slots may be powered independently.

How does the bus hold function operate without external resistors?

Each A0–A17 and B0–B17 pin integrates a weak feedback transistor network that maintains the last-valid logic state when the input floats. At 3.0 V, it sources/sinks ±75 μA to hold HIGH/LOW - sufficient to override typical PCB leakage but low enough to be overridden by active drivers, eliminating need for external pull-up/down resistors.

Can OEAB and OEBA be asserted simultaneously?

No - asserting both OEAB (active HIGH) and OEBA (active LOW) simultaneously places all 36 I/O pins in high-impedance state, effectively isolating both buses. This condition is explicitly supported and used for bus arbitration or diagnostic isolation, with no risk of contention or increased ICC.

What is the significance of the MULTIBYTE™ pinout architecture?

MULTIBYTE™ refers to the alternating A/B pin arrangement (e.g., A0/B0/A1/B1) across the TSSOP56 package. This layout allows straight-through PCB routing with minimal layer transitions and crosstalk, preserving signal integrity in high-speed parallel buses and simplifying layout for 18-bit-wide interfaces.