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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

NXP Semiconductors 74LVT16646ADL,512

Name: 74LVT16646ADL,512
Brand: NXP Semiconductors
SKU: 74LVT16646ADL,512
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVT16646ADL,512

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 56-BSSOP (0.295", 7.50mm Width)

Datasheet:: 74LVT16646ADL,512.pdf

Description:: IC TXRX NON-INVERT 3.6V 56SSOP

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Product details

Overview

74LVT16646ADL,512 from Nexperia is a 3.3 V, 16-bit universal bus transceiver with non-inverting 3-state outputs in both directions, 56-pin SSOP package, −40 °C to +85 °C operating range, and 150 MHz maximum clock frequency. It enables bidirectional data transfer between two 16-bit buses (A and B) in computing and industrial backplane systems requiring level translation and bus isolation.

For engineers reviewing the 74LVT16646ADL,512 datasheet, 74LVT16646ADL,512 pinout, 74LVT16646ADL,512 application, or 74LVT16646ADL,512 equivalent, key selection criteria include its dual-clock (CPAB/CPBA) synchronous latching, bus-hold inputs eliminating external pull-ups, ±64 mA output drive capability, and compatibility with 5 V-tolerant I/O interfaces in mixed-voltage system designs.

Technical Context

The 74LVT16646ADL,512 implements two independent 8-bit register banks per direction (A→B and B→A), each controlled by dedicated clock (CPAB/CPBA), direction (DIR), select (SAB/SBA), and output enable (OE) signals. Its BiCMOS architecture delivers TTL-compatible switching levels while operating from a single 3.3 V supply.

It supports four operational modes: real-time A→B or B→A transfer, stored-data transfer, and simultaneous storage on both buses - all governed by LOW-to-HIGH clock transitions and DIR/OE logic states. Bus-hold circuitry maintains valid logic levels on unused I/O pins without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.7 V to 3.6 V - Enables stable operation across industrial voltage tolerances; 3.3 V nominal matches modern logic rails.
Max Clock Frequency	150 MHz at VCC = 3.3 V - Supports high-speed parallel bus communication in embedded controllers and FPGA interconnects.
Propagation Delay	0.5–3.7 ns (tPLH/tPHL, CL = 50 pF) - Ensures sub-4 ns timing margins for 200+ Mbps bus throughput.
Output Drive	+64 mA / −32 mA - Drives heavy capacitive loads (e.g., long traces, multiple receivers) without signal degradation.
I/O Voltage Tolerance	0 V to 5.5 V input; −0.5 V to +7.0 V absolute max - Allows safe interfacing with legacy 5 V systems without level shifters.
Bus-Hold Current	±75 µA to ±140 µA - Actively retains logic state on floating A/B-side data pins, removing need for external pull resistors.
Quiescent Current	70 µA typical (outputs disabled) - Minimizes standby power in always-on industrial modules.

Pinout & Package

74LVT16646ADL,512 uses SSOP56 (SOT371-1) package: plastic shrink small outline, 56 leads, 7.5 mm body width, 0.635 mm lead pitch, and exposed pad not present.

Pin/Terminal	Circuit Role	Design Meaning
1DIR, 2DIR	Direction control (bits 0–7, 8–15)	Determines data flow direction: HIGH = A→B; LOW = B→A; enables full-duplex bus arbitration.
1OE, 2OE	Output enable (bits 0–7, 8–15)	Active-LOW control for 3-state output drivers; allows cascading multiple transceivers on shared bus segments.
1CPAB, 2CPAB	A→B clock (bits 0–7, 8–15)	Latches real-time or stored A-side data to B bus on LOW-to-HIGH transition; synchronizes transfers.
1CPBA, 2CPBA	B→A clock (bits 0–7, 8–15)	Latches real-time or stored B-side data to A bus on LOW-to-HIGH transition; enables bidirectional sync.
1SAB, 2SAB	A→B select (bits 0–7, 8–15)	Controls multiplexing: LOW = real-time A data; HIGH = previously stored A data routed to B bus.
1SBA, 2SBA	B→A select (bits 0–7, 8–15)	Controls multiplexing: LOW = real-time B data; HIGH = previously stored B data routed to A bus.
1A0–1A7, 2A0–2A7	A-side I/O (bits 0–15)	Bidirectional data interface for bus A; includes bus-hold on all pins; tolerant to 5 V inputs.
1B0–1B7, 2B0–2B7	B-side I/O (bits 0–15)	Bidirectional data interface for bus B; identical electrical specs and bus-hold as A-side pins.
VCC (pins 7, 22, 35)	Power supply	Three dedicated 3.3 V supply pins reduce IR drop and improve noise immunity across wide die.
GND (pins 4, 11, 18, 25, 32, 39, 46, 53)	Ground reference	Eight ground pins provide low-inductance return paths, critical for signal integrity at >100 MHz.

Key Features

Feature	Design Value
16-bit universal bus interface	Supports independent A↔B data routing with separate clocks, direction, and select controls per 8-bit half - enabling flexible memory-mapped I/O and DMA channel management.
Bus-hold inputs	Eliminates external pull-up/pull-down resistors on all 32 I/O pins, reducing BOM count and PCB area in space-constrained industrial modules.
Live insertion/extraction	Allows hot-swap of daughter cards in modular backplanes without disrupting host controller operation or causing bus contention.
Power-up 3-state	Outputs remain high-impedance during power ramp-up, preventing bus conflicts and ensuring glitch-free initialization in multi-rail systems.
Latch-up protection	Exceeds 500 mA per JESD78 - guarantees robustness against transient overvoltage events in noisy factory-floor environments.

Applications

Industrial Backplane Interface	Embedded Controller Expansion
Use Scenario: Interfacing a 3.3 V FPGA-based main controller to legacy 5 V peripheral modules via a shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing A→B (FPGA→peripheral) and B→A (peripheral→FPGA) data paths with synchronous clocking. Use Value: Eliminates discrete level shifters and pull-up networks while supporting 150 MHz burst transfers and maintaining signal integrity across 15 cm backplane traces.	Use Scenario: Expanding GPIO and memory-mapped I/O on an ARM Cortex-M7 microcontroller in a programmable logic controller (PLC). IC Role / Device Role / Timing Role: Configurable 16-bit I/O port extender with internal storage registers, enabling software-controlled data capture and replay. Use Value: Reduces firmware overhead by offloading real-time bus sampling and buffering; bus-hold prevents spurious interrupts from floating inputs during configuration.
Test Equipment Data Acquisition	Modular Instrumentation Chassis
Use Scenario: Capturing parallel digital waveforms from DUTs in automated test equipment (ATE) with mixed-voltage signal sources. IC Role / Device Role / Timing Role: Synchronized sampling transceiver capturing 16-bit snapshots on CPAB/CPBA edges, with DIR and OE enabling dynamic bus partitioning. Use Value: Achieves deterministic 6.7 ns timing resolution (150 MHz clock) and handles input voltages up to 5.5 V without clamping diodes or external protection.	Use Scenario: Enabling hot-swappable module communication in a PXI-style instrumentation chassis where slots require isolated 3.3 V/5 V domain bridging. IC Role / Device Role / Timing Role: Isolation and arbitration transceiver allowing concurrent read/write operations between slot controller and module-specific buses. Use Value: Live insertion support and power-up 3-state prevent bus glitches during module replacement; eight GND pins suppress crosstalk in dense 56-pin layout.

Industrial Backplane Interface

Embedded Controller Expansion

Use Scenario: Interfacing a 3.3 V FPGA-based main controller to legacy 5 V peripheral modules via a shared parallel bus.

IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing A→B (FPGA→peripheral) and B→A (peripheral→FPGA) data paths with synchronous clocking.

Use Value: Eliminates discrete level shifters and pull-up networks while supporting 150 MHz burst transfers and maintaining signal integrity across 15 cm backplane traces.

Use Scenario: Expanding GPIO and memory-mapped I/O on an ARM Cortex-M7 microcontroller in a programmable logic controller (PLC).

IC Role / Device Role / Timing Role: Configurable 16-bit I/O port extender with internal storage registers, enabling software-controlled data capture and replay.

Use Value: Reduces firmware overhead by offloading real-time bus sampling and buffering; bus-hold prevents spurious interrupts from floating inputs during configuration.

Test Equipment Data Acquisition

Modular Instrumentation Chassis

Use Scenario: Capturing parallel digital waveforms from DUTs in automated test equipment (ATE) with mixed-voltage signal sources.

IC Role / Device Role / Timing Role: Synchronized sampling transceiver capturing 16-bit snapshots on CPAB/CPBA edges, with DIR and OE enabling dynamic bus partitioning.

Use Value: Achieves deterministic 6.7 ns timing resolution (150 MHz clock) and handles input voltages up to 5.5 V without clamping diodes or external protection.

Use Scenario: Enabling hot-swappable module communication in a PXI-style instrumentation chassis where slots require isolated 3.3 V/5 V domain bridging.

IC Role / Device Role / Timing Role: Isolation and arbitration transceiver allowing concurrent read/write operations between slot controller and module-specific buses.

Use Value: Live insertion support and power-up 3-state prevent bus glitches during module replacement; eight GND pins suppress crosstalk in dense 56-pin layout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ALVT16646DL,118	Lower ICC (20 µA quiescent), higher VOL (0.55 V at 64 mA), same SSOP56 package and pinout.	Optimized for ultra-low-power battery-backed systems; reduced drive strength limits trace length to ≤8 cm at 150 MHz.	Select when minimizing standby current is critical and load capacitance is <30 pF.
SN74LVC16646DGGR	3.3 V only (no 5 V tolerance), 48-pin TSSOP, 100 MHz max frequency, lower drive (±24 mA).	Suitable for cost-sensitive consumer designs with shorter interconnects and no legacy 5 V interface requirement.	Choose for compact layouts where 5 V compatibility is unnecessary and 100 MHz bandwidth suffices.

Compared with 74LVT16646ADL,512, the 74ALVT16646DL,118 trades drive strength for lower static power, while the SN74LVC16646DGGR reduces package size and cost at the expense of 5 V tolerance and speed - making the 74LVT16646ADL,512 optimal for industrial backplanes demanding robustness, speed, and mixed-voltage interoperability.

Availability

74LVT16646ADL,512 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded controller expansion requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for 74LVT16646ADL,512 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 leader spun off from NXP's Standard Products division in 2017, specializing in high-performance logic, discrete, and power MOSFET solutions for automotive, industrial, and computing markets.

The 74LVT16646ADL,512 belongs to Nexperia's LVT (Low-Voltage Technology) logic family, engineered for 3.3 V systems needing high-speed bidirectional data transfer, 5 V-tolerant I/O, and robust ESD/latch-up protection in harsh environments.

FAQ

What is the maximum clock frequency supported by the 74LVT16646ADL,512?

The 74LVT16646ADL,512 supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.3 V ± 0.3 V). This specification is validated across the full industrial temperature range (−40 °C to +85 °C) and ensures reliable setup/hold timing for synchronous data latching on CPAB and CPBA inputs. The 74LVT16646ADL,512 achieves this performance using BiCMOS process technology optimized for low propagation delay and high drive capability.

Does the 74LVT16646ADL,512 support 5 V logic inputs while operating at 3.3 V supply?

Yes, the 74LVT16646ADL,512 accepts input voltages up to 5.5 V while powered from a 3.3 V supply, with absolute maximum ratings extending to +7.0 V. Its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and integrated input clamp diodes allow direct connection to 5 V CMOS or TTL outputs without external level-shifting circuitry. This feature is explicitly confirmed in Table 6 (Recommended Operating Conditions) and Table 5 (Limiting Values) of the official Nexperia datasheet for the 74LVT16646ADL,512.

How does the bus-hold function operate on the 74LVT16646ADL,512 I/O pins?

The 74LVT16646ADL,512 integrates bus-hold circuitry on all 32 A- and B-side I/O pins, providing ±75 µA to ±140 µA overdrive current to maintain the last-valid logic state when inputs float. This eliminates the need for external pull-up or pull-down resistors, reducing BOM cost and PCB footprint. The bus-hold strength is specified in Table 7 (Static Characteristics) and functions independently of OE, DIR, or clock states - active whenever VCC is applied and pins are un-driven.

What is the purpose of the SAB and SBA pins on the 74LVT16646ADL,512?

The SAB (Select A→B) and SBA (Select B→A) pins on the 74LVT16646ADL,512 control multiplexing between real-time and stored data paths. When SAB = LOW, real-time data from bus A passes directly to bus B; when SAB = HIGH, previously latched data from the A-side registers is transferred instead. Similarly, SBA selects real-time vs. stored data for B→A transfers. This dual-mode capability enables flexible data buffering and pipeline control in protocol-aware interfaces, as defined in Table 4 (Function Table) of the 74LVT16646ADL,512 datasheet.

Is the 74LVT16646ADL,512 pin-compatible with other packages in the same family?

No, the 74LVT16646ADL,512 is specific to the SSOP56 (SOT371-1) package with 7.5 mm body width. While the 74LVT16646A functional silicon is also offered in TSSOP56 (74LVT16646ADGG, SOT364-1, 6.1 mm width), the two packages have different mechanical dimensions, lead pitch, and thermal characteristics - making them physically incompatible on the same PCB footprint. Pin numbering and signal mapping are identical, but board layout must be redesigned to accommodate the larger SSOP56 body and wider lead spacing of the 74LVT16646ADL,512.

74LVT16646ADL,512 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74LVT

Package/Case:: 56-BSSOP (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 32mA, 64mA

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 56-SSOP

74LVT16646ADL,512 FAQ

1.How can I place an order for 74LVT16646ADL,512 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVT16646ADL,512 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74LVT16646ADL,512 reliable?

The price and inventory of 74LVT16646ADL,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT16646ADL,512 is usually 5 days.

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74LVT16646ADL,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVT16646ADL,512 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74LVT16646ADL,512?

For technical support, including 74LVT16646ADL,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT16646ADL,512 requirements.

6.How does Aetrix verify that 74LVT16646ADL,512 is sourced from the original manufacturer or authorized distributors?

All 74LVT16646ADL,512 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LVT16646ADL,512 meets industry standards.

7.What is the process for return or replacement of 74LVT16646ADL,512?

All 74LVT16646ADL,512 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT16646ADL,512, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74LVT16646ADL,512 part is unused and in its original packaging.

Return procedure for 74LVT16646ADL,512:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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