Nexperia USA Inc. 74ALVCH16500DGGY

Overview

74ALVCH16500DGGY 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 latch enable (LEAB/LEBA), clock (CPAB/CPBA), and complementary output enables (OEAB active HIGH, OEBA active LOW), operating across 1.65 V–3.6 V supply. Used in high-density memory/data bus interfacing between FPGAs and microcontrollers in industrial control backplanes.

For engineers reviewing the 74ALVCH16500DGGY datasheet, 74ALVCH16500DGGY pinout, 74ALVCH16500DGGY application, or 74ALVCH16500DGGY equivalent, key selection criteria include dual-directional latch/clock timing control, IOFF partial power-down protection, bus hold functionality for floating input stabilization, and TSSOP56 package compatibility with high-pin-count PCB routing constraints.

Technical Context

This device implements two independent 18-bit data paths-A-to-B and B-to-A-with separate control logic per direction. Each path uses a latch-enable/clock architecture where LEAB/LEBA determine transparent vs. latched operation, and CPAB/CPBA trigger edge-sensitive storage on HIGH-to-LOW transitions.

The IOFF circuit disables outputs during partial power-down, blocking backflow current when VCC = 0 V, while bus hold inputs maintain last-valid logic state without external pull-ups. Output drive capability reaches ±24 mA at 3.0 V, supporting direct termination into 50 Ω transmission lines at 85 °C.

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. Features multiple VCC/GND pins (4×VCC, 10×GND) for low-noise power delivery and minimized ground bounce.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16500DGGR and 74LVC16500ADGG, the 74ALVCH16500DGGY uniquely combines bus hold, IOFF, and full 1.65–3.6 V operation in one package-reducing BOM count, improving robustness in uncontrolled input environments, and enabling safer hot-swap capability.

Availability

74ALVCH16500DGGY is available at Aetrix Electronics and suitable for industrial backplane interfacing, FPGA-to-ASIC bridging, memory expansion subsystems, and legacy bus protocol translation requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74ALVCH16500DGGY 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 leading Dutch semiconductor manufacturer specializing in high-performance logic, analog, and discrete components for industrial, automotive, and consumer applications.

The 74ALVCH series targets high-speed, low-power, multi-bit interface solutions for space-constrained embedded systems-designed specifically for robust operation in noisy industrial environments with mixed-voltage domain interoperability.

FAQ

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

The complementary output enable polarity allows independent, asynchronous control of A→B and B→A data flow using single-ended logic signals without inverters. OEAB active HIGH enables B-side outputs directly from a positive-logic controller, while OEBA active LOW permits direct connection to open-drain or wired-OR control buses common in legacy industrial systems.

How does the bus hold feature eliminate the need for external pull-up/down resistors?

Each data pin integrates a weak feedback transistor network that maintains the last-driven logic state (HIGH or LOW) when the input floats. With IBHL = +150 μA and IBHH = −175 μA at 3.0 V, it actively sources/sinks sufficient current to override typical PCB leakage, ensuring deterministic logic levels without external biasing components.

Can the 74ALVCH16500DGGY operate reliably at 1.65 V while maintaining full speed performance?

No-maximum speed is voltage-dependent. At 1.65 V, the device meets static specifications but dynamic performance degrades: fmax drops to 150 MHz (vs. 340 MHz at 3.3 V), and tpd increases to 5.2 ns (vs. 2.9 ns). For full-speed operation, VCC ≥ 2.3 V is required per Table 5's recommended conditions.

What design considerations apply when using IOFF during partial power-down?

When VCC = 0 V, IOFF forces all outputs into high-impedance state regardless of OEAB/OEBA logic levels. To prevent contention, ensure no other powered device drives the same B- or A-bus lines during power-down. Also verify that GND remains connected to maintain reference integrity for the IOFF circuitry.