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

NXP Semiconductors 74LVC646APW,112

Name: 74LVC646APW,112
Brand: NXP Semiconductors
SKU: 74LVC646APW,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVC646APW,112

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74LVC646APW,112.pdf

Description:: IC TXRX NON-INVERT 3.6V 24TSSOP

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Product details

Overview

74LVC646APW,112 from NXP Semiconductors is an octal non-inverting bus transceiver/register with 3-state outputs, dual D-type latches, and bidirectional data flow control via DIR and OE inputs. It operates from 1.2 V to 3.6 V supply, supports 5 V-tolerant I/O, and enables real-time or registered data transfer between A and B buses in mixed-voltage systems such as industrial backplanes and FPGA I/O expansion.

For engineers reviewing the 74LVC646APW,112 datasheet, 74LVC646APW,112 pinout, 74LVC646APW,112 application, or 74LVC646APW,112 equivalent, key selection criteria include its 24-pin TSSOP package, 3.6 V max supply, −40 °C to +125 °C temperature range, 5.5 V tolerant outputs in high-impedance state, and support for both transparent and registered data modes via CPAB/CPBA clocking.

Technical Context

The 74LVC646APW,112 integrates two independent 8-bit register banks (A and B) with edge-triggered clocks CPAB and CPBA, enabling storage of data from either bus on rising edges. Its direction control (DIR) and output enable (OE) inputs define real-time vs. stored data routing and bus drive activation.

Select source inputs SAB and SBA allow multiplexing between live and latched data per channel. The device maintains input functionality even when outputs are disabled, supporting simultaneous capture and transmission - critical for handshake protocols and buffered memory interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	1.2 V to 3.6 V - enables operation in ultra-low-power 1.2 V logic domains and compatibility with standard 3.3 V systems.
I/O Voltage Tolerance	Up to 5.5 V on inputs/outputs - allows safe interfacing between 3.3 V logic and legacy 5 V peripherals without level shifters.
Operating Temperature	−40 °C to +125 °C - qualified for under-hood automotive, industrial motor control, and extended-range embedded applications.
Propagation Delay	1.0 ns to 8.0 ns (VCC = 3.0–3.6 V) - supports high-speed data transfer up to 150 MHz in registered mode and 120 MHz at full temperature range.
Output Drive Strength	±24 mA (VCC = 3.0 V) - sufficient to drive 50 Ω transmission lines or multiple CMOS loads without external buffers.
Power Dissipation Capacitance	15.0 pF (VCC = 3.0–3.6 V) - enables accurate dynamic power estimation using PD = CPD × VCC² × fi × N.
ESD Protection	HBM > 2000 V, CDM > 1000 V - exceeds JEDEC JESD22-A114F/A101E, ensuring robustness during handling and board assembly.

Pinout & Package

TSSOP24 plastic thin shrink small outline package (SOT355-1), 24 leads, body width 4.4 mm, 0.65 mm pitch, lead finish matte tin.

Pin/Terminal	Circuit Role	Design Meaning
1 CPAB	A-to-B clock input	Rising-edge triggered; latches A-bus data into B-register for subsequent output or storage.
2 SAB	A-to-B select source	When LOW, routes real-time A data to B bus; when HIGH, routes stored A data to B bus.
3 DIR	Direction control	LOW enables B→A data flow; HIGH enables A→B data flow - defines active bus direction when OE is active.
4–11 A0–A7	A-bus I/O terminals	Bidirectional data ports; function as inputs when receiving data from B bus or outputs when driving B bus.
12 GND	Ground reference	Primary 0 V return path for all internal circuitry and I/O current sinks.
13–20 B0–B7	B-bus I/O terminals	Bidirectional data ports; function as inputs when receiving data from A bus or outputs when driving A bus.
21 OE	Output enable	Active LOW; disables all outputs to high-impedance state while preserving input functionality and register contents.
22 SBA	B-to-A select source	When LOW, routes real-time B data to A bus; when HIGH, routes stored B data to A bus.
23 CPBA	B-to-A clock input	Rising-edge triggered; latches B-bus data into A-register for subsequent output or storage.
24 VCC	Supply voltage	Core logic and I/O supply; must be decoupled locally to suppress switching noise and ensure timing stability.

Key Features

Feature	Design Value
Back-to-back register architecture	Enables simultaneous capture of A and B bus data on separate clock edges, supporting ping-pong buffering in DMA controllers.
Separate directional controls (DIR + OE)	Allows independent management of data direction and output state - essential for implementing isolated bus arbitration logic.
5 V-tolerant I/O with 1.2 V–3.6 V core	Eliminates need for external level translators in mixed-supply systems, reducing BOM count and PCB area in FPGA/CPU interface designs.
Partial power-down support	Inputs/outputs remain high-impedance when VCC = 0 V - prevents back-driving and latch-up during hot-swap or power sequencing events.
JEDEC-compliant voltage standards	Fully compliant with JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V) - ensures interoperability across voltage-tiered logic families.

Applications

Industrial Backplane Interface	FPGA I/O Expansion
Use Scenario: Interfacing a 3.3 V FPGA I/O bank to legacy 5 V peripheral modules on a modular PLC backplane. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver with register staging to absorb timing skew between asynchronous bus domains. Use Value: Eliminates discrete level shifters and reduces interconnect latency by enabling direct register-to-register handshaking at up to 120 MHz over the full temperature range.	Use Scenario: Extending the I/O count of a Xilinx Artix-7 FPGA by connecting additional parallel sensors and actuators operating at 2.5 V or 3.3 V. IC Role / Device Role / Timing Role: Octal registered transceiver providing synchronized data capture and output staging between FPGA fabric and external parallel devices. Use Value: Enables deterministic setup/hold timing (tsu/th ≥ 1.5 ns at 3.3 V) and supports 24 mA drive strength to meet fanout requirements without signal integrity degradation.
Automotive Body Control Module	Test Equipment Data Acquisition
Use Scenario: Isolating and conditioning communication between a 1.8 V microcontroller and 5 V CAN transceiver or LIN physical layer in a body control unit. IC Role / Device Role / Timing Role: Voltage-level agnostic bus interface with isolation mode (OE = HIGH) to prevent bus contention during MCU reset sequences. Use Value: Guarantees −40 °C to +125 °C operation, withstands 5.5 V transients on outputs, and provides ESD immunity exceeding 2000 V HBM for reliability in harsh automotive environments.	Use Scenario: Capturing parallel digital waveforms from DUTs with mismatched logic families (e.g., TTL, LVTTL, LVCMOS) in automated test equipment. IC Role / Device Role / Timing Role: Registered acquisition buffer that samples and holds incoming data on CPAB/CPBA edges before forwarding to ADC or memory controller. Use Value: Supports 150 MHz maximum frequency at 3.3 V and offers precise propagation delay matching (tsk(o) ≤ 1.5 ns) for multi-channel time-aligned sampling.

Industrial Backplane Interface

FPGA I/O Expansion

Use Scenario: Interfacing a 3.3 V FPGA I/O bank to legacy 5 V peripheral modules on a modular PLC backplane.

IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver with register staging to absorb timing skew between asynchronous bus domains.

Use Value: Eliminates discrete level shifters and reduces interconnect latency by enabling direct register-to-register handshaking at up to 120 MHz over the full temperature range.

Use Scenario: Extending the I/O count of a Xilinx Artix-7 FPGA by connecting additional parallel sensors and actuators operating at 2.5 V or 3.3 V.

IC Role / Device Role / Timing Role: Octal registered transceiver providing synchronized data capture and output staging between FPGA fabric and external parallel devices.

Use Value: Enables deterministic setup/hold timing (tsu/th ≥ 1.5 ns at 3.3 V) and supports 24 mA drive strength to meet fanout requirements without signal integrity degradation.

Automotive Body Control Module

Test Equipment Data Acquisition

Use Scenario: Isolating and conditioning communication between a 1.8 V microcontroller and 5 V CAN transceiver or LIN physical layer in a body control unit.

IC Role / Device Role / Timing Role: Voltage-level agnostic bus interface with isolation mode (OE = HIGH) to prevent bus contention during MCU reset sequences.

Use Value: Guarantees −40 °C to +125 °C operation, withstands 5.5 V transients on outputs, and provides ESD immunity exceeding 2000 V HBM for reliability in harsh automotive environments.

Use Scenario: Capturing parallel digital waveforms from DUTs with mismatched logic families (e.g., TTL, LVTTL, LVCMOS) in automated test equipment.

IC Role / Device Role / Timing Role: Registered acquisition buffer that samples and holds incoming data on CPAB/CPBA edges before forwarding to ADC or memory controller.

Use Value: Supports 150 MHz maximum frequency at 3.3 V and offers precise propagation delay matching (tsk(o) ≤ 1.5 ns) for multi-channel time-aligned sampling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC8T245RHLR	8-bit dual-supply translator (VCCA/VCCB); no internal registers or CPAB/CPBA clocks.	Lacks registered data path and multiplexed source selection - suitable only for simple level translation, not buffered bus interfacing.	Choose when only voltage translation is needed and clocked storage is unnecessary.
74ALVC164245PAG	16-bit version in TSSOP48; higher pin count, wider supply (1.65–3.6 V), but no SAB/SBA multiplexing or dual-clock architecture.	Provides greater data width but lacks per-channel real-time/stored data selection - less flexible for mixed-mode bus arbitration.	Choose when 16-bit width is required and simplified control logic suffices.

Compared with SN74LVC8T245RHLR and 74ALVC164245PAG, the 74LVC646APW,112 uniquely combines 8-bit bidirectional registered transfer, 5 V-tolerant I/O, and per-bus multiplexed source selection in a compact 24-pin TSSOP - making it optimal for space-constrained, timing-critical bus bridging where data staging and voltage translation are both required.

Availability

74LVC646APW,112 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and FPGA-based prototyping requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74LVC646APW,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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74LVC646APW,112 belongs to NXP's LVC logic family, designed specifically for low-voltage, high-speed, mixed-supply system interfacing with robust ESD performance and extended temperature operation.

FAQ

What is the maximum operating voltage for the 74LVC646APW,112 outputs when in 3-state?

The 74LVC646APW,112 outputs tolerate up to 5.5 V in the high-impedance (3-state) condition, as specified in Table 4 of the datasheet. This allows safe connection to 5 V buses while powered from a 3.3 V or lower supply - a key enabler for mixed-voltage system design without external clamping diodes.

Does the 74LVC646APW,112 support true bidirectional data flow with independent clocking?

Yes, the 74LVC646APW,112 supports independent bidirectional data flow via dedicated CPAB (A→B) and CPBA (B→A) clock inputs, each triggering edge-sensitive latching. This allows concurrent registration of data from both buses - a capability confirmed in the functional diagram (Fig 4) and function table (Table 3).

Can the 74LVC646APW,112 operate at 1.2 V supply voltage across the full temperature range?

No - while the 74LVC646APW,112 supports a minimum supply of 1.2 V, the recommended operating conditions (Table 5) specify functional operation only down to −40 °C to +85 °C at 1.2 V. Full −40 °C to +125 °C operation requires VCC ≥ 1.65 V, as confirmed in the static characteristics tables.

How does the 74LVC646APW,112 handle bus contention during direction switching?

The 74LVC646APW,112 prevents bus contention through strict output enable (OE) control: outputs remain in high-impedance until OE is asserted LOW *and* DIR establishes direction. The function table (Table 3) confirms that only one bus (A or B) is driven at any time - a hardware-enforced constraint verified in the logic diagram (Fig 4).

Is the 74LVC646APW,112 pin-compatible with other members of the 74LVC646A family?

Yes - the 74LVC646APW,112 shares identical pin configuration and electrical behavior with 74LVC646AD (SO24) and 74LVC646ADB (SSOP24), as confirmed by the shared pin description table (Table 2) and functional diagram (Fig 5). All variants use the same SOT355-1, SOT137-1, and SOT340-1 outlines respectively, with identical pin numbering and signal assignments.

74LVC646APW,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74LVC

Package/Case:: 24-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 1.2V ~ 3.6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-TSSOP

74LVC646APW,112 FAQ

1.How can I place an order for 74LVC646APW,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVC646APW,112 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 74LVC646APW,112 reliable?

The price and inventory of 74LVC646APW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC646APW,112 is usually 5 days.

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4.How is shipping managed for 74LVC646APW,112?

74LVC646APW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVC646APW,112 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 74LVC646APW,112?

For technical support, including 74LVC646APW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC646APW,112 requirements.

6.How does Aetrix verify that 74LVC646APW,112 is sourced from the original manufacturer or authorized distributors?

All 74LVC646APW,112 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 74LVC646APW,112 meets industry standards.

7.What is the process for return or replacement of 74LVC646APW,112?

All 74LVC646APW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC646APW,112, 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 74LVC646APW,112 part is unused and in its original packaging.

Return procedure for 74LVC646APW,112:

1.Submit a request within 90 days.

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

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