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NXP Semiconductors 74LVC646APW,118
- Part No.:
- 74LVC646APW,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVC646APW,118.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,007
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Product details
Overview
74LVC646APW,118 from NXP Semiconductors is an octal non-inverting bus transceiver with dual 8-bit D-type registers, 3-state outputs, 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 functions across −40 °C to +125 °C for mixed-voltage system interfacing in industrial control backplanes.
For engineers reviewing the 74LVC646APW,118 datasheet, 74LVC646APW,118 pinout, 74LVC646APW,118 application, or 74LVC646APW,118 equivalent, this device delivers real-time and registered data multiplexing between A and B buses with independent clock (CPAB/CPBA), select (SAB/SBA), and direction control-critical for FPGA-to-ASIC bridging, memory-mapped peripheral expansion, and voltage-level translation in legacy 5 V / modern 3.3 V subsystems.
Technical Context
The 74LVC646APW,118 implements two independent 8-bit register banks (A→B and B→A) with edge-triggered clocks (CPAB and CPBA), enabling simultaneous storage of data from either bus. Its DIR input selects active data path direction while OE enables/disables 3-state outputs without disabling input receivers-allowing transparent data capture during output isolation.
Real-time transfer (bypassing registers) and stored-data transfer are selected per bus using SAB and SBA inputs. The device complies with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36 across its full 1.2 V–3.6 V VCC range and maintains functional operation at 150 MHz (VCC ≥ 2.7 V) with propagation delays as low as 1.0 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2 V to 3.6 V - Enables direct integration into ultra-low-power microcontroller domains and compatibility with 1.8 V/2.5 V/3.3 V logic families. |
| I/O Voltage Tolerance | Up to 5.5 V on inputs/outputs - Allows safe interfacing between 3.3 V systems and legacy 5 V peripherals without external level shifters. |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood automotive modules, industrial PLCs, and high-reliability embedded controllers. |
| Propagation Delay (tpd) | 1.0 ns (min) at VCC = 3.0–3.6 V - Supports high-speed synchronous data handshaking in real-time control loops and memory-mapped I/O. |
| Maximum Frequency | 150 MHz at VCC ≥ 2.7 V - Sustains reliable operation in burst-mode peripheral interfaces and FPGA configuration bridges. |
| ESD Protection | HBM > 2000 V, MM > 200 V, CDM > 1000 V - Meets robustness requirements for board-level handling and field-deployed equipment. |
| Power Dissipation Capacitance | 15.0 pF at VCC = 3.0–3.6 V - Enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal-aware PCB layout. |
Pinout & Package
TSSOP24 package (SOT355-1): plastic thin shrink small outline, 24 leads, body width 4.4 mm, 0.65 mm pitch - optimized for high-density PCB layouts with improved thermal performance over SO24/SSOP24 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CPAB) | A-to-B clock input | Edge-triggered (LOW→HIGH) signal latching A-bus data into B-register; enables synchronized write to B-side storage. |
| 2 (SAB) | A-to-B select source | When LOW, routes real-time A-bus data to B outputs; when HIGH, routes stored A-register data to B outputs. |
| 3 (DIR) | Direction control | LOW enables B→A data flow; HIGH enables A→B data flow - determines active transceiver direction when OE is active. |
| 4–11 (A0–A7) | A-bus I/O terminals | Bidirectional data lines for A-side interface; remain functional as inputs even when outputs are 3-stated (OE = HIGH). |
| 12 (GND) | Ground reference | Primary 0 V return path for all internal logic and I/O circuits; must be low-impedance for noise immunity. |
| 13–20 (B0–B7) | B-bus I/O terminals | Bidirectional data lines for B-side interface; support simultaneous storage and real-time access during isolation mode. |
| 21 (OE) | Output enable | Active-LOW control: disables all outputs (3-state) while preserving input functionality for continuous register updates. |
| 22 (SBA) | B-to-A select source | When LOW, routes real-time B-bus data to A outputs; when HIGH, routes stored B-register data to A outputs. |
| 23 (CPBA) | B-to-A clock input | Edge-triggered (LOW→HIGH) signal latching B-bus data into A-register; enables synchronized write to A-side storage. |
| 24 (VCC) | Supply voltage | Single 1.2–3.6 V rail powers all logic and I/O; supports partial power-down (high-Z I/O at VCC = 0 V). |
Key Features
| Feature | Design Value |
|---|---|
| Back-to-back 8-bit registers | Enables independent storage of A-bus and B-bus data simultaneously-critical for handshake-free buffering in asynchronous interconnects. |
| Separate directional controls (DIR + OE) | Allows decoupled management of data path direction and output drive state-supporting complex bus arbitration schemes without external logic. |
| Multiplexed real-time/stored data selection (SAB/SBA) | Permits dynamic switching between live bus traffic and previously captured snapshots-essential for diagnostic logging and fault recovery in safety-critical systems. |
| 5 V tolerant I/O with 1.2 V core | Eliminates need for discrete level translators in mixed-supply systems-reducing BOM count and PCB area in industrial gateway designs. |
| Support for partial power-down (VCC = 0 V) | Maintains high-impedance I/O states during system sleep modes-preventing bus contention and leakage current in battery-powered edge nodes. |
Applications
| Industrial Backplane Interface | FPGA-to-Microcontroller Bridging |
|---|---|
Use Scenario: Interfacing a 5 V legacy PLC I/O module with a 3.3 V ARM-based controller over a shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional voltage translator and register buffer that isolates timing domains while synchronizing data transfers via CPAB/CPBA edges. Use Value: Eliminates external level-shifting ICs and reduces bus turnaround latency by 35% compared to software-controlled GPIO bit-banging. | Use Scenario: Connecting an FPGA's general-purpose I/O bank (3.3 V) to a microcontroller's 8-bit parallel interface (1.8 V) for firmware update packet streaming. IC Role / Device Role / Timing Role: Register-based transceiver providing glitch-free data capture and deterministic output enable timing for burst-mode transfers. Use Value: Prevents metastability-induced packet corruption during hot-plug events and supports 150 MHz sustained throughput without FIFO overflow. |
| Automotive Diagnostic Port Expansion | Memory-Mapped Peripheral Hub |
Use Scenario: Expanding OBD-II diagnostic port connectivity to support multiple ECUs sharing a single CAN-to-parallel bridge ASIC. IC Role / Device Role / Timing Role: Isolation-capable bus transceiver with independent A/B storage for concurrent diagnostic command queuing and response buffering. Use Value: Enables simultaneous read/write access to diagnostic registers across temperature ranges up to +125 °C without signal integrity degradation. | Use Scenario: Aggregating multiple 8-bit sensor interfaces (e.g., ADCs, temperature monitors) onto a microcontroller's memory-mapped peripheral bus. IC Role / Device Role / Timing Role: Registered bus interface that decouples sensor sampling rate from MCU bus arbitration latency using SAB/SBA multiplexing. Use Value: Reduces average sensor read latency by 42% versus unregistered transceivers and eliminates bus contention during multi-sensor polling cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC8T245RHLR | 8-bit dual-supply transceiver (no internal registers); separate VCCA/VCCB rails; no CPAB/CPBA or SAB/SBA controls. | Lacks register storage and multiplexed real-time/stored data routing-suitable only for simple level translation without timing synchronization. | Select when bidirectional voltage translation without data capture is sufficient and board space permits dual-rail routing. |
| 74ALVC164245DL,118 | 16-bit version in SSOP48; higher drive strength (24 mA); same 1.2–3.6 V VCC but no SAB/SBA multiplexing or dual-clock architecture. | Provides wider data path but omits per-bus select logic and independent clock inputs-limits use to static bus extension rather than dynamic data staging. | Choose for high-throughput parallel links where register functionality is handled externally and 16-bit width justifies larger footprint. |
Compared with SN74LVC8T245RHLR and 74ALVC164245DL,118, the 74LVC646APW,118 uniquely integrates dual 8-bit registers, independent A/B clocking, and multiplexed real-time/stored data selection-making it the only option among the three capable of implementing deterministic, low-latency data staging in mixed-voltage embedded systems.
Availability
74LVC646APW,118 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive diagnostic gateways, and FPGA-to-MCU bridging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVC646APW,118 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,118 belongs to NXP's LVC logic family-designed specifically for low-voltage, high-speed, mixed-signal interfacing in space-constrained and thermally demanding environments.
FAQ
What is the maximum operating frequency of the 74LVC646APW,118 at 3.3 V supply?
The 74LVC646APW,118 supports a maximum frequency of 150 MHz at VCC = 3.0 V to 3.6 V, as specified in Table 7 of the NXP datasheet. This applies to both real-time and registered data paths when operating within −40 °C to +125 °C ambient conditions. At 3.3 V, typical propagation delay is 3.1 ns, enabling reliable timing closure in high-speed parallel interfaces.
Does the 74LVC646APW,118 support true bidirectional data flow without external control logic?
Yes, the 74LVC646APW,118 supports fully autonomous bidirectional data flow using its dedicated DIR (direction) and OE (output enable) inputs. When OE is LOW, DIR selects whether data flows from A→B (DIR = HIGH) or B→A (DIR = LOW). The 74LVC646APW,118 requires no external latches or glue logic to manage directionality or output states.
Can the 74LVC646APW,118 operate with a 1.2 V supply while maintaining 5 V-tolerant inputs?
Yes, the 74LVC646APW,118 is fully specified down to 1.2 V VCC and retains 5 V tolerance on all inputs and outputs across its entire supply range. Input clamping diodes and robust oxide design allow safe operation with VI up to 5.5 V regardless of VCC level-enabling direct connection to 5 V sources even when powered from ultra-low-voltage rails.
How does the 74LVC646APW,118 handle bus isolation during power-down sequences?
When VCC = 0 V, the 74LVC646APW,118 enters partial power-down mode: all I/O pins enter high-impedance state regardless of OE or DIR status, preventing back-driving or leakage current into unpowered subsystems. This behavior is guaranteed per JEDEC JESD78 and verified in the device's static characteristics table.
What is the function of the SAB and SBA pins on the 74LVC646APW,118?
The SAB (A-to-B select source) and SBA (B-to-A select source) pins determine whether real-time bus data or stored register data is routed to the opposite bus. For example, when SAB = HIGH, stored A-register contents appear on B outputs; when SAB = LOW, live A-bus signals pass through. The 74LVC646APW,118 uses these pins to implement dynamic data multiplexing without CPU intervention.
74LVC646APW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,118 FAQ
1.How can I place an order for 74LVC646APW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC646APW,118 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,118 reliable?
The price and inventory of 74LVC646APW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC646APW,118 is usually 5 days.
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Once your 74LVC646APW,118 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,118?
For technical support, including 74LVC646APW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC646APW,118 requirements.
6.How does Aetrix verify that 74LVC646APW,118 is sourced from the original manufacturer or authorized distributors?
All 74LVC646APW,118 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,118 meets industry standards.
7.What is the process for return or replacement of 74LVC646APW,118?
All 74LVC646APW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC646APW,118, 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,118 part is unused and in its original packaging.
Return procedure for 74LVC646APW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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