Nexperia USA Inc. 74ALVCH162601DGG:1

Overview

74ALVCH162601DGG:1 from Nexperia is an 18-bit universal bus transceiver with integrated 30 Ω termination resistors, bus hold inputs, and dual-directional 3-state outputs. It supports A↔B bidirectional data flow controlled by independent clock, latch enable, output enable, and clock enable signals per direction. Operates from 1.65 V to 3.6 V supply, features IOFF partial power-down protection, and is rated for −40 °C to +85 °C industrial temperature range - used in high-density memory expansion and backplane interface applications.

For engineers reviewing the 74ALVCH162601DGG:1 datasheet, 74ALVCH162601DGG:1 pinout, 74ALVCH162601DGG:1 application, or 74ALVCH162601DGG:1 equivalent, key selection considerations include its 18-bit dual-latch architecture, on-die 30 Ω termination, bus hold functionality for floating-bus immunity, and TSSOP56 package compatibility with high-speed PCB routing constraints.

Technical Context

This device implements two independent 18-bit data paths (A-to-B and B-to-A), each with separate clock (CPAB/CPBA), latch enable (LEAB/LEBA), clock enable (CEAB/CEBA), and output enable (OEAB/OEBA) controls. Latching behavior is configurable: transparent mode when LE is HIGH; edge-triggered storage on CPAB/CPBA rising edge when LE and CE are LOW.

The integrated 30 Ω series termination resistors reduce signal reflections on parallel buses, while bus hold circuitry maintains valid logic states on un-driven inputs without external pull-ups. IOFF functionality disables outputs during partial power-down, blocking backflow current between powered and unpowered rails.

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. Features multiple VCC/GND pairs (4×VCC, 8×GND) to minimize ground bounce and supply noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH162601DGGR and 74LVC162245ADGG, the 74ALVCH162601DGG:1 uniquely combines on-die 30 Ω termination, bus hold, and IOFF in a single TSSOP56 package - reducing BOM count by up to 36 components and enabling true mixed-voltage hot-swap operation without design compromises.

Availability

74ALVCH162601DGG:1 is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial PLC I/O modules, telecom backplane buses, and embedded computing backplanes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVCH162601DGG:1 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 focused on essential efficiency technologies - delivering high-performance, reliable standard products including logic, discretes, MOSFETs, and ESD protection devices.

The 74ALVCH series targets high-speed, low-power, mixed-voltage digital interfacing applications, emphasizing robustness in industrial and computing environments through features like bus hold, IOFF, and integrated termination.

FAQ

What is the purpose of the IOFF feature in the 74ALVCH162601DGG:1?

The IOFF (power-off protection) circuitry disables all outputs when VCC drops below functional threshold, preventing backflow current from live system rails into the unpowered transceiver. This protects downstream components during partial power-down sequences and enables safe hot-swap operation in modular systems without requiring external isolation circuitry.

How does the bus hold function operate without external biasing?

Bus hold uses internal feedback transistors to weakly reinforce the last-valid logic state on each A/B input pin. When an input floats, the circuit sources or sinks ~75–175 μA to maintain VIH or VIL within specification - eliminating need for external pull-up/down resistors while consuming <1 μA additional quiescent current per held pin.

Can the 74ALVCH162601DGG:1 be used for unidirectional data transfer?

Yes - though designed for bidirectional use, it supports unidirectional operation by tying OEBA LOW (disabling B→A path) and controlling OEAB alone. The LEAB/CPAB/CEAB controls remain fully functional for latched or transparent A→B transfer, preserving timing flexibility and termination benefits on the active path.

What is the impact of the integrated 30 Ω termination on signal integrity?

The 30 Ω series termination matches typical PCB trace impedances (50–75 Ω) in source-series configuration, reducing overshoot, undershoot, and ringing by damping reflections at the driver end. Measured propagation delays show <5.5 ns variation across voltage/temperature, confirming consistent signal fidelity without external tuning.