NXP Semiconductors 74LVT16646ADGG,112

Overview

74LVT16646ADGG,112 from Nexperia is a 3.3 V 16-bit universal bus transceiver with non-inverting 3-state outputs on both A and B buses, 1.9 ns typical propagation delay (CL = 50 pF), ±32 mA output drive, and bus-hold inputs eliminating external pull-ups. It enables bidirectional real-time or stored data transfer between two 16-bit buses in industrial computing backplanes.

For engineers reviewing the 74LVT16646ADGG,112 datasheet, 74LVT16646ADGG,112 pinout, 74LVT16646ADGG,112 application, or 74LVT16646ADGG,112 equivalent, key selection criteria include its dual-clock (CPAB/CPBA) and dual-select (SAB/SBA) control architecture, 5 V tolerant I/O, power-up 3-state behavior, and TSSOP56 package compatibility with high-density PCB layouts.

Technical Context

The 74LVT16646ADGG,112 implements two independent 8-bit register banks per side (A0–A7/A8–A15 and B0–B7/B8–B15), each controlled by dedicated DIR, OE, CPAB/CPBA, and SAB/SBA signals. Its BiCMOS design supports TTL-level input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) while operating from a 2.7–3.6 V supply.

Real-time transfer (e.g., A→B with DIR=H, SAB=L) and stored-data transfer (e.g., A→B with DIR=H, SAB=H, CPAB active) are decoupled via separate clock and select paths, minimizing timing constraints on system-level bus arbitration. Bus-hold circuitry maintains valid logic states on unused I/O pins without external components.

Key Specifications

Pinout & Package

TSSOP56 plastic thin shrink small outline package (SOT364-1), 56-pin, 6.1 mm body width, 0.5 mm pitch - optimized for automated assembly and thermal performance in space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16646AIPM and 74ALVCH16646PAG, the 74LVT16646ADGG,112 delivers superior 5 V tolerance and higher output drive within the narrower TSSOP56 package, making it optimal for industrial backplanes where voltage interoperability and signal integrity are prioritized over minimal quiescent current.

Availability

74LVT16646ADGG,112 is available at Aetrix Electronics and suitable for industrial automation backplanes, embedded controller expansion interfaces, and high-density compute module interconnects requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).

Supply support for 74LVT16646ADGG,112 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 leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with core focus on automotive, industrial, computing, and consumer markets.

The 74LVT16646ADGG,112 belongs to Nexperia's high-performance LVT logic family, engineered for robust 3.3 V bus interfacing in noise-sensitive industrial systems requiring 5 V tolerance, bus-hold, and live-insertion capability.

FAQ

What is the maximum clock frequency supported by the 74LVT16646ADGG,112?

The 74LVT16646ADGG,112 supports a maximum clock frequency of 150 MHz at VCC = 3.3 V ± 0.3 V, as specified in Table 8 of the datasheet. This applies to both CPAB and CPBA inputs under recommended operating conditions with CL = 50 pF and RL = 500 Ω. The device maintains timing integrity across the full −40 °C to +85 °C ambient range.

Does the 74LVT16646ADGG,112 require external pull-up resistors on its I/O pins?

No, the 74LVT16646ADGG,112 does not require external pull-up resistors due to integrated bus-hold circuitry on all 32 I/O pins (A0–A15 and B0–B15). This feature actively maintains the last-valid logic state with ±75 µA to ±140 µA overdrive current, eliminating BOM cost and PCB space associated with discrete pull resistors.

Can the 74LVT16646ADGG,112 interface directly with 5 V logic systems?

Yes, the 74LVT16646ADGG,112 supports 5 V tolerant inputs and outputs: VI up to 5.5 V and VO up to 7.0 V under limiting conditions. Its TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and 3.3 V supply allow direct connection to 5 V buses without level-shifting components, simplifying mixed-voltage system design.

What is the purpose of the SAB and SBA pins on the 74LVT16646ADGG,112?

The SAB (select A-to-B) and SBA (select B-to-A) pins on the 74LVT16646ADGG,112 determine whether real-time or stored data is routed across the transceiver. When SAB = LOW, real-time A-side data passes to B; when SAB = HIGH, previously latched A-side data is output to B - enabling flexible bus arbitration and data buffering without external logic.

Is the 74LVT16646ADGG,112 compatible with hot-swap or live-insertion systems?

Yes, the 74LVT16646ADGG,112 is explicitly designed for live insertion and extraction, as confirmed in Section 2 (Features) of the datasheet. Its power-up 3-state behavior, bus-hold inputs, and robust ESD protection (2000 V HBM) prevent bus contention and damage during hot-plug operations in modular backplane and rack-mounted systems.