NXP Semiconductors 74ALVCH16646DGG512

Overview

74ALVCH16646DGG512 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 active bus-hold on all data inputs. It operates from 2.3 V to 3.6 V, supports real-time and registered data transfer modes, and delivers ±24 mA output drive at 3.0 V - used in high-density memory interface buffering and multi-bus system isolation in industrial control backplanes.

For engineers reviewing the 74ALVCH16646DGG512 datasheet, 74ALVCH16646DGG512 pinout, 74ALVCH16646DGG512 application, or 74ALVCH16646DGG512 equivalent, key selection criteria include its dual-clock (nCPAB/nCPBA) register capture capability, multiplexed select inputs (nSAB/nSBA), TSSOP56 package thermal and noise performance, and JEDEC-compliant voltage operation across −40 °C to +85 °C.

Technical Context

This device integrates two independent 8-bit transceiver/register sections (Section 1 and Section 2), each with dedicated direction (nDIR), output enable (nOE), clock (nCPAB/nCPBA), and select (nSAB/nSBA) controls. Its architecture enables simultaneous storage of A- and B-bus data during isolation mode (nOE = HIGH), while allowing selective real-time or registered output routing via nSAB/nSBA under active transceiver mode (nOE = LOW).

Each channel implements a D-type flip-flop synchronized to rising-edge clocks, with bus-hold circuitry maintaining valid logic levels on floating inputs without external pull-ups. The MULTIBYTE™ flow-through pinout minimizes signal skew, and low-inductance multiple VCC/GND pins reduce ground bounce in high-speed parallel bus applications up to 320 MHz clock frequency.

Key Specifications

Pinout & Package

TSSOP56 package (SOT364-1), 6.1 mm body width, 56-pin plastic thin shrink small outline; features 8 GND and 4 VCC pins for low-noise power distribution and minimized ground bounce.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16646DGGR, the 74ALVCH16646DGG512 offers identical functionality and mechanical compatibility but differs in manufacturer-specific process optimization and qualification documentation. Versus 74LVC16646ADGG, it provides guaranteed bus-hold and tighter dynamic timing at lower VCC (2.3 V), making it superior for industrial backplane reliability.

Availability

74ALVCH16646DGG512 is available at Aetrix Electronics and suitable for industrial backplane interface, memory subsystem buffering, test equipment data acquisition, and automated test system channel multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVCH16646DGG512 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 high-volume, high-reliability logic, analog, and MOSFET components, with leadership in automotive and industrial standard products.

The 74ALVCH16646DGG512 belongs to Nexperia's advanced ALVCH logic family, designed specifically for high-speed, low-power, noise-immune parallel bus interfacing in industrial automation, test instrumentation, and communications infrastructure.

FAQ

What is the maximum clock frequency supported by the 74ALVCH16646DGG512 in register mode?

The 74ALVCH16646DGG512 supports a maximum clock frequency of 320 MHz when operating in register mode (nCPAB/nCPBA) at VCC = 3.0–3.6 V, as specified in Table 7 of the datasheet. This enables high-throughput data capture in applications such as memory subsystem buffering and test equipment acquisition where deterministic timing alignment is critical. The 74ALVCH16646DGG512 achieves this performance while maintaining sub-4 ns propagation delay and robust noise immunity.

Does the 74ALVCH16646DGG512 require external pull-up resistors on its control inputs?

No - the 74ALVCH16646DGG512 includes active bus-hold circuitry on all 32 data inputs (1A0–2B7), eliminating the need for external pull-up or pull-down resistors to prevent floating states. However, for reliable power-up behavior, Nexperia recommends tying nOE to VCC via a pull-up resistor (minimum value determined by driver current capability) to ensure outputs remain in high-impedance state during power ramp. The 74ALVCH16646DGG512 does not provide bus-hold on control inputs (nDIR, nCPAB, etc.), so those may still require external biasing if left unconnected.

Can the 74ALVCH16646DGG512 operate reliably at 2.3 V supply voltage?

Yes - the 74ALVCH16646DGG512 is fully specified down to 2.3 V supply voltage per Table 5 (Recommended Operating Conditions) and Table 6 (Static Characteristics). At 2.3 V, it maintains VIH/VIL thresholds, ±12 mA output drive, and 4.8 ns max propagation delay, enabling interoperability with legacy 2.5 V logic domains while retaining bus-hold functionality and JEDEC JESD8-5 compliance. The 74ALVCH16646DGG512 delivers consistent timing and noise margin across its entire 2.3–3.6 V range without derating.

How does the 74ALVCH16646DGG512 handle simultaneous data capture from both A and B buses?

The 74ALVCH16646DGG512 supports concurrent data capture from both buses during isolation mode (nOE = HIGH): a rising edge on nCPAB stores A-bus data into internal registers, while a rising edge on nCPBA stores B-bus data - both operations can occur independently and simultaneously. Stored data remains latched until selected for output via nSAB/nSBA under active transceiver mode. This dual-capture capability enables time-aligned snapshotting of bidirectional traffic, essential in protocol analyzers and bus monitoring tools using the 74ALVCH16646DGG512.

What is the purpose of the MULTIBYTE™ flow-through pinout in the 74ALVCH16646DGG512?

The MULTIBYTE™ flow-through pinout in the 74ALVCH16646DGG512 arranges complementary A/B data pairs (e.g., 1A0 and 1B0) adjacently in the TSSOP56 package to minimize PCB trace length differences and inter-channel skew. This layout directly reduces timing mismatch in parallel bus applications - critical for maintaining setup/hold margins in high-speed memory interfaces and backplane designs. Unlike traditional zig-zag layouts, the 74ALVCH16646DGG512's linear pin mapping simplifies routing, lowers crosstalk, and improves signal integrity without requiring length-matching techniques.