Nexperia USA Inc. 74ALVCH162601DGGY

Overview

74ALVCH162601DGGY from Nexperia is an 18-bit universal bus transceiver with integrated 30 Ω termination resistors, bus hold inputs, and 3-state outputs. It supports bidirectional A↔B data flow controlled by independent clock, latch enable, output enable, and clock enable signals per direction. Operates across 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 - deployed in high-density memory expansion and backplane interface subsystems.

For engineers reviewing the 74ALVCH162601DGGY datasheet, 74ALVCH162601DGGY pinout, 74ALVCH162601DGGY application, or 74ALVCH162601DGGY equivalent, key selection considerations include its dual-directional latch/clock control architecture, on-die 30 Ω termination eliminating external resistors, bus hold functionality for floating-input immunity, 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), each with configurable transparent/latched operation via LEAB/LEBA and edge-triggered storage via CPAB/CPBA with CEAB/CEBA gating. The IOFF circuit actively disables outputs during power-down, blocking reverse current flow between powered and unpowered buses.

Bus hold circuitry maintains last-valid logic state at all 36 I/O pins (A0–A17, B0–B17) without external pull-ups, while integrated 30 Ω series termination resistors reduce signal reflections on high-speed parallel buses operating up to 240 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. Features multiple VCC/GND pairs (4×VCC, 8×GND) to minimize ground bounce and supply noise in high-speed switching.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH162601DGGR, the 74ALVCH162601DGGY offers tighter bus hold current tolerance and broader IOFF activation range, improving robustness in mixed-supply systems; versus 74LVC162245ADGG, it eliminates 36 external components and guarantees noise-immune input behavior without design overhead.

Availability

74ALVCH162601DGGY is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial I/O subsystems, FPGA-ASIC interconnects, and backplane bridging applications requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for 74ALVCH162601DGGY 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 logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74ALVCH series targets high-speed, low-voltage parallel bus applications demanding robust signal integrity, power-aware operation, and compact packaging - optimized for memory subsystems, FPGA interconnects, and industrial control backplanes.

FAQ

What is the purpose of the IOFF feature in the 74ALVCH162601DGGY?

The IOFF (power-off protection) circuit disables all outputs when VCC drops below a threshold, forcing them into high-impedance state regardless of input or control pin states. This prevents damaging back-current flow from live buses into a powered-down device, enabling safe hot-swap and partial-power-down operation in multi-rail systems.

Can the 74ALVCH162601DGGY operate with only one supply voltage domain active?

Yes - the IOFF feature ensures outputs remain high-impedance even when VCC = 0 V, allowing the device to safely sit between two independently powered buses (e.g., a live 3.3 V backplane and a powered-down 1.8 V module). Inputs remain functional only when VCC is within specification (1.65–3.6 V).

How does the bus hold circuit interact with the 30 Ω termination resistors?

The bus hold circuit operates independently of the 30 Ω series termination: bus hold maintains DC logic state at the input pin, while the 30 Ω resistor damps AC signal reflections on the PCB trace. Both functions coexist without conflict - bus hold ensures static stability; termination ensures dynamic signal fidelity.

Is the 74ALVCH162601DGGY pin-compatible with older ALVC or LVT variants?

No - although functionally similar to 74ALVC162601 and 74LVT162601, the 74ALVCH162601DGGY uses the same TSSOP56 footprint but differs in electrical behavior: higher bus hold current, tighter IOFF activation, and updated ESD ratings per JS-001/JS-002. Direct replacement requires validation of timing, drive strength, and power sequencing.