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NXP Semiconductors 74LVC646ADB,118
- Part No.:
- 74LVC646ADB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LVC646ADB,118.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,379
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Product details
Overview
74LVC646ADB,118 from NXP Semiconductors is an octal non-inverting bus transceiver with dual 8-bit D-type registers, 3-state outputs, and independent A↔B direction control. It operates from 1.2 V to 3.6 V, supports 5 V-tolerant I/O (up to 5.5 V), and functions across −40 °C to +125 °C. Used in bidirectional data buffering between mixed-voltage buses (e.g., 3.3 V microcontroller ↔ 5 V peripheral).
For engineers reviewing the 74LVC646ADB,118 datasheet, 74LVC646ADB,118 pinout, 74LVC646ADB,118 application, or 74LVC646ADB,118 equivalent, key selection criteria include its dual-register storage capability, real-time vs. registered multiplexing via SAB/SBA, 3.6 V max supply, 5.5 V tolerant outputs, and SSOP24 package compatibility with high-density PCB layouts.
Technical Context
The 74LVC646ADB,118 integrates two independent 8-bit D-type flip-flop banks (A and B registers) clocked by edge-triggered CPAB and CPBA inputs. Its DIR input selects data flow direction during active OE (LOW), while OE=HIGH enables isolation mode with register retention. SAB and SBA inputs select between real-time (transparent) and stored data for output multiplexing.
It supports partial power-down: when VCC = 0 V, all I/Os enter high-impedance state with IOFF ≤ ±20 µA at 5.5 V. Input thresholds comply with JEDEC JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V), ensuring interoperability across LVC voltage bands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.2 V to 3.6 V - Enables operation in ultra-low-power and mixed-supply systems; functional down to 1.2 V. |
| I/O Voltage Tolerance | Up to 5.5 V - Allows safe interfacing with 5 V TTL/CMOS logic without level shifters. |
| Operating Temperature | −40 °C to +125 °C - Qualified for automotive under-hood and industrial control environments. |
| Propagation Delay | 1.0 ns to 8.0 ns (VCC = 3.0–3.6 V) - Supports high-speed bidirectional data transfer up to 150 MHz. |
| Output Drive Strength | ±24 mA (VCC = 3.0 V) - Sufficient to drive standard CMOS loads and moderate capacitive buses. |
| 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, MM > 200 V, CDM > 1000 V - Robust handling during board assembly and field operation. |
Pinout & Package
74LVC646ADB,118 uses the SSOP24 (SOT340-1) package: plastic shrink small outline, 24 leads, 5.3 mm body width, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CPAB | A-to-B clock input | Edge-triggered (LOW→HIGH); latches A-bus data into B register. |
| 2 SAB | A-to-B select source | When LOW: outputs real-time A data; when HIGH: outputs stored A data on B bus. |
| 3 DIR | Direction control | LOW = B→A data flow; HIGH = A→B data flow (active when OE = LOW). |
| 4–11 A0–A7 | A-bus I/O | Bi-directional data lines for A-side interface; input function always enabled. |
| 12 GND | Ground reference | 0 V return path for all internal circuitry and I/Os. |
| 13–20 B0–B7 | B-bus I/O | Bi-directional data lines for B-side interface; input function always enabled. |
| 21 OE | Output enable | Active LOW; disables outputs (3-state) while preserving input functionality and register state. |
| 22 SBA | B-to-A select source | When LOW: outputs real-time B data; when HIGH: outputs stored B data on A bus. |
| 23 CPBA | B-to-A clock input | Edge-triggered (LOW→HIGH); latches B-bus data into A register. |
| 24 VCC | Supply voltage | Primary power rail (1.2–3.6 V); powers logic and I/O buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8-bit D-type registers | Enables independent storage of A- and B-bus data for synchronized handshaking or pipeline staging. |
| Separate A↔B clock and select controls | Allows asynchronous capture and multiplexed output of real-time or registered data per bus direction. |
| 5 V-tolerant I/O with 3.6 V supply | Eliminates external level translators in mixed-voltage systems (e.g., 3.3 V FPGA ↔ 5 V sensor bus). |
| Zero-power shutdown support | VCC = 0 V forces all I/Os into high-Z with < ±20 µA leakage - critical for battery-backed isolation. |
| JEDEC-compliant voltage thresholds | Guarantees interoperability across LVC families operating at 1.65–3.6 V supply ranges. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Bidirectional data exchange between a 3.3 V ARM-based controller and legacy 5 V I/O expansion modules over a shared backplane bus. IC Role / Device Role / Timing Role: Octal transceiver with register staging acts as voltage-translating buffer and synchronization latch between clock domains. Use Value: Eliminates discrete level shifters and reduces component count; 5.5 V tolerance prevents damage during hot-plug events. | Use Scenario: Isolating and routing sensor data (e.g., door lock status, window position) between 5 V analog front-end ICs and a 3.3 V CAN microcontroller. IC Role / Device Role / Timing Role: Direction-controlled bus interface with storage registers enables deterministic sampling and glitch-free signal forwarding. Use Value: −40 °C to +125 °C rating ensures reliability in under-dash environments; low ICC (≤40 µA) minimizes standby current draw. |
| Test Equipment Digital I/O Card | Medical Diagnostic Data Acquisition |
Use Scenario: Configurable digital pattern generator/analyzer card requiring programmable bus direction, real-time pass-through, and captured snapshot modes. IC Role / Device Role / Timing Role: Dual-register transceiver provides hardware-selectable transparent or registered data paths for stimulus/response timing control. Use Value: Independent SAB/SBA and CPAB/CPBA inputs allow precise setup/hold timing control (tsu/th ≥1.0 ns at 3.3 V) for test signal integrity. | Use Scenario: Interfacing high-resolution ADCs (5 V output) to low-power 1.8 V/3.3 V medical SoCs in portable ultrasound or ECG units. IC Role / Device Role / Timing Role: Voltage-tolerant bus interface with isolated register storage decouples ADC sampling clock from SoC processing clock. Use Value: 15.0 pF CPD enables accurate power modeling for battery life estimation; 2000 V HBM ESD protects sensitive analog front-ends. |
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 | Single-direction 8-bit transceiver with no internal registers; lacks CPAB/CPBA, SAB/SBA, and DIR-controlled bidirectional latching. | Suitable only for simple level-shifted pass-through; cannot store or multiplex real-time/registered data. | Select when only voltage translation and direction control (no storage) are required; lower pin count and cost. |
| 74LVC16646ADGG | 16-bit version in TSSOP48 package; identical register architecture and 5 V tolerance but double data width and different pinout. | Used where higher channel density is needed (e.g., 16-bit memory buses); not drop-in compatible due to pin count and layout. | Choose for wider data paths; requires PCB redesign but retains same functional behavior and timing specs. |
Compared with SN74LVC8T245RHLR and 74LVC16646ADGG, the 74LVC646ADB,118 uniquely combines octal bidirectional latching, real-time/registered multiplexing, and 5 V-tolerant I/O in a compact SSOP24 package-making it optimal for space-constrained, mixed-voltage systems requiring deterministic data staging.
Availability
74LVC646ADB,118 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and mixed-voltage interfaces.
Supply support for 74LVC646ADB,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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74LVC646ADB,118 belongs to NXP's LVC logic family, designed for low-voltage, high-speed, mixed-signal interfacing in power-sensitive and thermally demanding environments.
FAQ
What is the maximum supply voltage for the 74LVC646ADB,118?
The absolute maximum supply voltage (VCC) for the 74LVC646ADB,118 is +6.5 V, but the recommended operating range is 1.2 V to 3.6 V. Operating above 3.6 V risks violating the device's specified DC characteristics and may cause unreliable register behavior or increased leakage. Always maintain VCC within 1.2–3.6 V for guaranteed functionality and longevity of the 74LVC646ADB,118.
Can the 74LVC646ADB,118 interface directly with 5 V logic devices?
Yes, the 74LVC646ADB,118 features 5 V-tolerant inputs and outputs - meaning it accepts input voltages up to 5.5 V and can drive outputs up to 5.5 V even when VCC is as low as 1.2 V. This allows direct connection to 5 V TTL/CMOS devices without external level shifters, making the 74LVC646ADB,118 ideal for bridging 3.3 V and 5 V subsystems safely and reliably.
How does the DIR pin affect data flow in the 74LVC646ADB,118?
The DIR pin determines the direction of active data transfer when OE is LOW: DIR = LOW enables B→A transmission (B data appears on A bus), while DIR = HIGH enables A→B transmission (A data appears on B bus). DIR has no effect in isolation mode (OE = HIGH), where both buses remain high-impedance but internal registers retain their stored values - a key behavior of the 74LVC646ADB,118 for system-level hold states.
What is the purpose of the SAB and SBA pins on the 74LVC646ADB,118?
SAB (A-to-B Select Source) and SBA (B-to-A Select Source) control whether the output on each bus reflects real-time (transparent) or registered (latched) data. When SAB = LOW, A-bus data passes through to B bus immediately; when SAB = HIGH, the last-latched A data (via CPAB) is output. Similarly, SBA selects real-time vs. stored B data for A-bus output - enabling flexible multiplexing unique to the 74LVC646ADB,118 architecture.
Does the 74LVC646ADB,118 support partial power-down operation?
Yes, the 74LVC646ADB,118 supports true partial power-down: when VCC = 0 V, all I/Os enter a high-impedance state with power-off leakage current (IOFF) ≤ ±20 µA at 5.5 V applied to any pin. This feature prevents back-driving and bus contention in systems with multiple power domains, and is explicitly characterized and guaranteed - a critical capability for the 74LVC646ADB,118 in battery-backed or hot-swap designs.
74LVC646ADB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVC
- Package/Case:
- 24-SSOP (0.209", 5.30mm 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-SSOP
74LVC646ADB,118 FAQ
1.How can I place an order for 74LVC646ADB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC646ADB,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 74LVC646ADB,118 reliable?
The price and inventory of 74LVC646ADB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC646ADB,118 is usually 5 days.
3.What payment methods are accepted for 74LVC646ADB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC646ADB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC646ADB,118?
74LVC646ADB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC646ADB,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 74LVC646ADB,118?
For technical support, including 74LVC646ADB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC646ADB,118 requirements.
6.How does Aetrix verify that 74LVC646ADB,118 is sourced from the original manufacturer or authorized distributors?
All 74LVC646ADB,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 74LVC646ADB,118 meets industry standards.
7.What is the process for return or replacement of 74LVC646ADB,118?
All 74LVC646ADB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC646ADB,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 74LVC646ADB,118 part is unused and in its original packaging.
Return procedure for 74LVC646ADB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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