NXP Semiconductors 74ALVCH16646DGG112

Overview

74ALVCH16646DGG112 from Nexperia is a 16-bit non-inverting bus transceiver/register with 3-state outputs, dual-directional data flow control (A↔B), D-type flip-flop registers per channel, and multiplexed real-time/stored data selection. It operates from 2.3 V to 3.6 V, delivers ±24 mA drive at 3.0 V, and supports -40 °C to +85 °C industrial temperature range - used in high-density memory interface buffering and bidirectional data path isolation in FPGA-ASIC interconnects.

For engineers reviewing the 74ALVCH16646DGG112 datasheet, 74ALVCH16646DGG112 pinout, 74ALVCH16646DGG112 application, or 74ALVCH16646DGG112 equivalent, key selection criteria include its dual-clock (nCPAB/nCPBA) register capture timing, bus-hold inputs for floating-data immunity, TSSOP56 package pin compatibility with MULTIBYTE™ flow-through layout, and JEDEC-compliant voltage thresholds across 2.3–3.6 V supply.

Technical Context

This device integrates two independent 8-bit transceiver/register sections (Section 1: pins 1–29; Section 2: pins 30–56), each with dedicated direction (nDIR), output enable (nOE), clock (nCPAB/nCPBA), and select (nSAB/nSBA) controls. Its architecture enables concurrent storage and transparent transfer: data can be latched from either bus while simultaneously routing stored or live data to the opposite bus under nOE-active conditions.

Bus-hold circuitry actively maintains valid logic levels on all 32 data I/Os (1A0–1A7, 1B0–1B7, 2A0–2A7, 2B0–2B7) without external pull-ups. Propagation delays are tightly specified - e.g., 2.6 ns typical (max 3.9 ns) for A→B data path at 3.3 V - supporting reliable operation in 320 MHz clock domains with ≤0.7 ns setup/hold margins.

Key Specifications

Pinout & Package

TSSOP56 package (SOT364-1), plastic thin shrink small outline, 56 leads, 6.1 mm body width, 0.5 mm pitch - optimized for high-density PCB layouts with low-inductance multiple VCC/GND pins to suppress ground bounce.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus transceiver/register applications.

Compared with SN74ALVTH16646DGGR and 74LVC16646ADGG, the 74ALVCH16646DGG112 uniquely combines bus-hold input protection, JEDEC multi-standard compliance (JESD8-7/5/C), and guaranteed 2.3 V minimum operation - making it optimal for ruggedized industrial backplanes and mixed-voltage upgrades where reliability and pinout retention are critical.

Availability

74ALVCH16646DGG112 is available at Aetrix Electronics and suitable for industrial control systems, FPGA prototyping platforms, and telecom infrastructure requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 74ALVCH16646DGG112 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, and scalable logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74ALVCH16646DGG112 belongs to Nexperia's advanced ALVCH logic family, engineered for low-power, high-speed bidirectional data transfer in space-constrained industrial and communications equipment with strict ESD and thermal requirements.

FAQ

What is the recommended power-up sequence for 74ALVCH16646DGG112 to ensure high-impedance outputs?

To guarantee high-impedance outputs during power-up, tie nOE to VCC through a pull-up resistor - minimum value determined by the driver's current-sinking capability. This prevents bus contention before system initialization completes. The 74ALVCH16646DGG112 does not require power sequencing between VCC and GND, but nOE must be held HIGH until control logic is ready. Bus-hold circuitry remains active regardless of nOE state, protecting floating inputs.

Does 74ALVCH16646DGG112 support true bidirectional data flow without external direction logic?

Yes - the 74ALVCH16646DGG112 supports full bidirectional operation using its integrated nDIR inputs: when nDIR = HIGH, data flows from port A to port B; when nDIR = LOW, data flows from port B to port A - all under active nOE control. Each section (1 and 2) has independent nDIR, enabling asymmetric direction control across the 16-bit width without external gates or microcontroller intervention.

How does bus-hold functionality work on 74ALVCH16646DGG112, and what design benefits does it provide?

Bus-hold circuitry on the 74ALVCH16646DGG112 actively maintains the last-valid logic state on all 32 data I/Os using weak feedback transistors - eliminating need for external pull-up/down resistors. This prevents floating inputs during hot-swap, power-down, or unconnected traces, reducing BOM cost and PCB area. IBHL and IBHH currents (75–150 μA) are specified across VCC range, ensuring robustness in noisy industrial environments.

Can 74ALVCH16646DGG112 operate reliably at 2.3 V supply while maintaining full timing performance?

Yes - the 74ALVCH16646DGG112 is fully characterized down to 2.3 V, with propagation delay max 4.8 ns and setup/hold times fully specified at this voltage. It complies with JESD8-5 (2.3–2.7 V), enabling interoperability with 2.5 V logic families. However, output drive strength reduces to ±12 mA at 2.3 V, so verify load matching for 50 Ω transmission lines in low-voltage operation.

What is the maximum clock frequency supported by 74ALVCH16646DGG112 for register capture operations?

The 74ALVCH16646DGG112 supports up to 320 MHz maximum clock frequency (fmax) on nCPAB and nCPBA inputs at VCC = 3.0–3.6 V, with pulse width tw ≥ 0.7 ns. At 2.3–2.7 V, fmax is 300 MHz. These values assume proper termination and ≤50 pF load; derate for heavier capacitive loads or longer trace lengths. Real-time transfer (transparent mode) is not clock-limited.