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NXP Semiconductors 74LVT646PW,112
- Part No.:
- 74LVT646PW,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVT646PW,112.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
74LVT646PW,112 from NXP Semiconductors (formerly Philips) is a 3.3V octal bus transceiver/register with 3-State outputs, combining bidirectional data transfer and independent A/B register storage in a single 24-pin TSSOP package. It supports real-time and stored-data multiplexing, delivers ±64mA/–32mA output drive, interfaces directly with 5V systems, and features bus-hold inputs eliminating external pull-ups.
For engineers reviewing the 74LVT646PW,112 datasheet, 74LVT646PW,112 pinout, 74LVT646PW,112 application, or 74LVT646PW,112 equivalent, this device serves as a high-speed, dual-function bus management IC for mixed-voltage board-level interconnects requiring latch-controlled data routing, live insertion capability, and robust ESD/latch-up protection.
Technical Context
The 74LVT646PW,112 integrates transceiver logic and D-type flip-flops to enable four distinct operational modes: real-time A↔B transfer, isolated register storage (A→B or B→A), and selective transfer of stored data. Its DIR and OE pins control direction and output state independently, while CPAB/CPBA clock inputs trigger register loading on rising edges.
It operates across –40°C to +85°C with VCC = 2.7–3.6V, supports TTL-level inputs and outputs, and maintains compatibility with 5V buses via input/output voltage tolerance up to 5.5V. Bus-hold circuitry on all A-side I/O pins ensures stable logic states without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | VCC = 2.7V to 3.6V - Enables operation in modern low-voltage digital systems while maintaining backward compatibility with 3.3V infrastructure. |
| Propagation Delay | tPLH/tPHL = 2.8/2.7 ns (An↔Bn) - Supports >150 MHz clock rates for high-throughput data routing between buses. |
| Output Drive | +64mA / –32mA sink/source - Drives heavy capacitive loads and multiple TTL inputs without external buffers. |
| Input Voltage Range | VI = 0V to 5.5V - Allows direct interfacing with legacy 5V logic without level-shifting circuitry. |
| Bus-Hold Current | IHOLD = ±75 µA (A-side) - Maintains valid logic states on unused A-bus pins, eliminating need for external pull-up resistors. |
| ESD Protection | ≥2000V HBM, ≥200V MM - Meets industrial handling requirements and reduces risk of field failure during assembly or maintenance. |
| Quiescent Current | ICCZ = 0.13 mA (outputs disabled) - Minimizes standby power in battery-sensitive or thermally constrained applications. |
Pinout & Package
74LVT646PW,112 uses a 24-pin plastic TSSOP Type I package (SOT360-1), 4.4 mm body width, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 23 | CPAB / CPBA | A-to-B or B-to-A clock input - Rising-edge-triggered register load control for respective bus data capture. |
| 2, 22 | SAB / SBA | Select input for real-time vs. stored data path - Determines whether transceiver passes live or latched bus values. |
| 3 | DIR | Direction control - Sets data flow direction (A→B when High, B→A when Low) during active transceiver mode. |
| 4–11 | A0–A7 | Data I/O (A side) - Bidirectional signals with integrated bus-hold; function as inputs or outputs depending on DIR/OE state. |
| 13–20 | B0–B7 | Data I/O (B side) - Bidirectional signals without bus-hold; require external termination if left floating. |
| 21 | OE | Active-low output enable - Disables all outputs to high-impedance state while preserving internal register contents and input functionality. |
| 12 | GND | Ground reference - Common return path for all internal logic and I/O circuits. |
| 24 | VCC | Positive supply - Powers BiCMOS core; must be decoupled locally per high-speed layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Combined transceiver + register functionality | Integrates 74LVT245 and 74LVT574 behaviors - eliminates two discrete ICs and reduces PCB area and signal routing complexity. |
| Multiplexed real-time/stored data paths | Enables dynamic switching between live bus traffic and previously captured snapshots - critical for diagnostic, arbitration, and protocol bridging functions. |
| Power-up 3-State and reset | Guarantees outputs remain high-impedance until VCC stabilizes - prevents bus contention during system power sequencing. |
| Live insertion/extraction support | Allows hot-swap of daughterboards or modules without disrupting host system operation - essential for modular backplane architectures. |
| No bus current loading at 5V | Outputs tolerate 5V bus voltages without sourcing/sinking current when disabled - simplifies mixed-voltage backplane design and avoids leakage-induced noise. |
Applications
| Backplane Interconnect | Protocol Translation Bridge |
|---|---|
Use Scenario: High-speed communication between 3.3V processor module and 5V peripheral card in a modular telecom chassis. IC Role / Device Role / Timing Role: Bus transceiver/register managing data flow direction, buffering burst transfers, and holding handshake signals during arbitration cycles. Use Value: Eliminates level shifters and separate latches while supporting live module replacement and deterministic timing via registered paths. |
Use Scenario: Converting parallel data streams between PCI-like and custom ASIC interfaces with differing clock domains. IC Role / Device Role / Timing Role: Synchronizing asynchronous bus transactions using independent A/B registers and controlled real-time pass-through. Use Value: Provides cycle-accurate data staging and direction control without FPGA logic overhead or external glue logic. |
| Industrial Control I/O Hub | Test Equipment Data Capture |
Use Scenario: Centralized I/O expansion for PLC rack with mixed 3.3V logic and legacy 5V sensor/actuator interfaces. IC Role / Device Role / Timing Role: Isolating and registering sensor readouts before forwarding to controller; storing command outputs for synchronized actuation. Use Value: Bus-hold inputs prevent floating states on unterminated sensor lines; latch capability enables glitch-free output updates across multiple channels. |
Use Scenario: Capturing parallel bus activity during functional test of microcontroller-based embedded devices. IC Role / Device Role / Timing Role: Simultaneously monitoring and logging A- and B-side data under programmable clock and select control. Use Value: Real-time + stored data multiplexing allows correlation of stimulus inputs with response outputs within single-cycle resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT646PWR | TI version in 24-pin TSSOP; identical pinout and AC specs but slightly higher ICCZ (0.2 mA typical) and no bus-hold on B-side. | Same functional scope; requires external pull-ups on B-bus if inputs float. | Preferred where TI supply chain alignment or qualification history is required; verify B-bus termination strategy. |
| 74ALVT646MTCX | ON Semiconductor variant in 24-pin TSSOP; matches propagation delay (2.8 ns) but lacks bus-hold and has lower ESD rating (1500V HBM). | Supports same voltage ranges and register modes but offers reduced robustness in handling-unfriendly environments. | Cost-optimized alternative where bus-hold and industrial ESD are not mandatory; validate layout for floating B-side inputs. |
Compared with SN74LVT646PWR and 74ALVT646MTCX, the 74LVT646PW,112 uniquely provides bus-hold on all A-side I/Os and superior ESD immunity, making it optimal for uncontrolled industrial or field-deployed systems where input stability and handling reliability are critical.
Availability
74LVT646PW,112 is available at Aetrix Electronics and suitable for backplane interconnects, protocol translation bridges, industrial I/O hubs, test equipment data capture, and modular embedded subsystems requiring stable component supply across extended product lifecycles.
Supply support for 74LVT646PW,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, formerly Philips Semiconductors, designs high-performance logic and interface solutions for industrial, automotive, and communications markets with emphasis on reliability and mixed-signal integration.
The 74LVT646PW,112 belongs to the LVT (Low-Voltage TTL) family, engineered specifically for 3.3V systems needing seamless interoperability with 5V logic, high-speed bus management, and robust physical layer characteristics.
FAQ
What is the operating voltage range for the 74LVT646PW,112?
The 74LVT646PW,112 operates over VCC = 2.7V to 3.6V, with full specification compliance across this range. Its inputs tolerate up to 5.5V, enabling direct connection to 5V buses without level-shifting components. This dual-voltage tolerance makes the 74LVT646PW,112 ideal for mixed-supply system interconnects where legacy and modern logic coexist on the same board.
Does the 74LVT646PW,112 support live insertion and extraction?
Yes, the 74LVT646PW,112 supports live insertion and extraction due to its power-up 3-State behavior and robust ESD protection (≥2000V HBM). During hot-swap events, outputs remain high-impedance until VCC stabilizes, preventing bus contention. The 74LVT646PW,112 also features latch-up immunity exceeding 500mA per JEDEC Std 17, ensuring resilience against transient faults during plug-in operations.
How does bus-hold functionality work on the 74LVT646PW,112?
Bus-hold circuitry is integrated only on the A0–A7 inputs of the 74LVT646PW,112, providing ±75 µA overdrive current to maintain the last-valid logic state when those pins float. This eliminates the need for external pull-up resistors on A-side signals, reducing BOM count and board space. B0–B7 inputs lack bus-hold and must be externally terminated if unused.
What are the key timing parameters that define the 74LVT646PW,112's performance?
Key timing parameters for the 74LVT646PW,112 include tPLH/tPHL = 2.8/2.7 ns (An↔Bn), fMAX = 150 MHz (VCC = 3.3V), and tPZH/tPHZ = 4.0/4.3 ns (OE enable/disable). These values ensure sub-3ns data path latency and fast 3-State control-critical for high-bandwidth bus arbitration and synchronous data capture. All AC specs are guaranteed across –40°C to +85°C.
Can the 74LVT646PW,112 be used in 5V-only systems?
No-the 74LVT646PW,112 requires a 3.3V VCC supply and is not rated for 5V operation. However, its inputs and outputs are 5V-tolerant (VI/VO up to 5.5V), allowing safe interfacing with 5V buses while powered from 3.3V. Using 5V for VCC would exceed absolute maximum ratings and damage the 74LVT646PW,112. Always maintain VCC = 2.7–3.6V.
74LVT646PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74LVT646PW,112 FAQ
1.How can I place an order for 74LVT646PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT646PW,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 74LVT646PW,112 reliable?
The price and inventory of 74LVT646PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT646PW,112 is usually 5 days.
3.What payment methods are accepted for 74LVT646PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT646PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT646PW,112?
74LVT646PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT646PW,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 74LVT646PW,112?
For technical support, including 74LVT646PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT646PW,112 requirements.
6.How does Aetrix verify that 74LVT646PW,112 is sourced from the original manufacturer or authorized distributors?
All 74LVT646PW,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 74LVT646PW,112 meets industry standards.
7.What is the process for return or replacement of 74LVT646PW,112?
All 74LVT646PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT646PW,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 74LVT646PW,112 part is unused and in its original packaging.
Return procedure for 74LVT646PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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