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Texas Instruments SN74LVC16646ADLR
- Part No.:
- SN74LVC16646ADLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC16646ADLR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC16646ADLR from Texas Instruments is a 16-bit bus transceiver and register with 3-state outputs, designed for bidirectional data flow between two 8-bit buses (A and B) in mixed-voltage systems. It operates from 1.65 V to 3.6 V, accepts 5.5-V inputs, supports real-time and registered transfer modes, and delivers 5.2 ns max propagation delay at 3.3 V - used in high-speed memory interface buffering and FPGA-to-ASIC interconnect.
For engineers reviewing the SN74LVC16646ADLR datasheet, SN74LVC16646ADLR pinout, SN74LVC16646ADLR application, or SN74LVC16646ADLR equivalent, key selection criteria include its dual 8-bit register/transceiver architecture, Ioff partial-power-down support, 56-pin SSOP (DL) package, and compatibility with 3.3-V/5-V mixed-signal environments.
Technical Context
The SN74LVC16646ADLR integrates two independent 8-bit transceiver channels, each with D-type flip-flops clocked on CLKAB/CLKBA rising edges, select-control logic (SAB/SBA) for glitch-free multiplexing between transparent and stored data paths, and direction (DIR) and output-enable (OE) control. Its Ioff circuitry disables outputs during power-down to prevent backflow.
It supports simultaneous storage of A- and B-bus data, isolation mode with hold storage, and real-time or registered transfers in either direction - all under single-supply operation with 1.65–3.6 V VCC and input tolerance up to 5.5 V, enabling level translation without external voltage translators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct use in modern low-voltage logic domains while maintaining backward compatibility with 3.3-V systems. |
| Input Voltage Tolerance | Up to 5.5 V - allows safe interfacing with legacy 5-V peripherals without level-shifting circuitry. |
| Max Propagation Delay | 5.2 ns at 3.3 V - supports >150 MHz clock operation for high-throughput data routing in memory buffers and bus arbiters. |
| Ioff Current | ±10 µA at 5.5 V - ensures robust partial-power-down behavior during system sleep states without signal integrity compromise. |
| Output Drive Strength | ±24 mA at 3.0 V - drives standard LVTTL loads across 16 pins with controlled edge rates and low ground bounce (<0.8 V). |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control, communications infrastructure, and automotive body electronics. |
| ESD Rating | 2000-V HBM, 1000-V CDM - meets JEDEC JESD22-A114 and JESD22-C101 for reliable handling in automated assembly lines. |
Pinout & Package
SN74LVC16646ADLR uses a 56-pin SSOP (DL) package with 0.5-mm lead pitch, 13.9 mm × 7.5 mm body size, and 1.2-mm max height - optimized for space-constrained PCB layouts while maintaining hand-solderability and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Determines data flow direction per 8-bit channel: DIR = L routes B→A; DIR = H routes A→B. |
| 1OE, 2OE | Output enable input | Active-low; OE = H places corresponding 8-bit port in high-impedance state for bus sharing. |
| 1CLKAB, 2CLKAB | Register clock (A-to-B) | Rising-edge triggered; latches A-bus data into internal register for later B-bus output. |
| 1CLKBA, 2CLKBA | Register clock (B-to-A) | Rising-edge triggered; latches B-bus data into internal register for later A-bus output. |
| 1SAB, 2SAB | Select A/B bus source | SAB = L selects real-time A data; SAB = H selects stored A data for B-bus output. |
| 1SBA, 2SBA | Select B/A bus source | SBA = L selects real-time B data; SBA = H selects stored B data for A-bus output. |
| A1–A8, B1–B8 | Bus I/O terminals | Two independent 8-bit bidirectional data ports; each pin functions as input or output based on DIR/OE state. |
| VCC, GND | Power supply | Single 1.65–3.6 V supply with multiple VCC/GND pairs distributed across package for low-noise operation. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant inputs with 3.3-V VCC enable direct connection to both legacy 5-V and modern 3.3-V logic families. |
| Glitch-free select control | Dedicated SAB/SBA logic eliminates decoding glitches during transitions between real-time and stored data paths. |
| Partial-power-down support | Ioff limits current flow when VCC = 0 V, protecting powered-down sections in hot-swap or multi-rail systems. |
| Dual 8-bit register/transceiver | Configurable as two independent 8-bit units or one unified 16-bit unit - increases layout flexibility and functional partitioning. |
| Low ground bounce & undershoot | Typical VOLP < 0.8 V and VOHV > 2 V at 3.3 V ensure stable signal integrity in dense, high-speed digital designs. |
Applications
| Memory Interface Buffering | FPGA-to-ASIC Interconnect |
|---|---|
Use Scenario: Isolating and synchronizing data between DDR SDRAM controller and memory bus in embedded computing modules. IC Role / Device Role / Timing Role: Acts as a registered transceiver to absorb timing skew, provide hold time margin, and decouple controller clock domain from memory clock domain. Use Value: Enables reliable 16-bit burst transfers at >100 MHz using stored-data mode, reducing setup/hold violations caused by trace-length mismatches. | Use Scenario: Bridging configurable I/O banks of Xilinx Artix-7 FPGA to fixed-function ASIC in industrial PLC backplane. IC Role / Device Role / Timing Role: Provides bidirectional voltage translation and register staging between 3.3-V FPGA I/O and 5-V ASIC peripherals. Use Value: Eliminates need for discrete level shifters and external registers, saving 4+ components and 120 mm² PCB area per interface link. |
| Industrial Backplane Arbitration | Test Equipment Data Multiplexing |
Use Scenario: Managing shared data lanes among multiple microcontrollers on a CAN-based automation backplane. IC Role / Device Role / Timing Role: Functions as a programmable bus switch with storage, allowing one MCU to broadcast to others while preserving prior state during arbitration cycles. Use Value: Supports deterministic latency ≤6 ns and glitch-free bus handover via synchronized CLKAB/CLKBA edges - critical for real-time cycle consistency. | Use Scenario: Routing parallel test vectors from pattern generator to multiple DUT sites in automated test equipment (ATE). IC Role / Device Role / Timing Role: Serves as a selectable 16-bit data multiplexer with on-chip storage, enabling pre-loaded stimulus sequences independent of generator timing. Use Value: Reduces pattern generator bandwidth requirement by 60% through stored-data replay, improving test throughput without increasing system clock rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245ADLR | No internal registers; transparent-only operation; lacks CLKAB/CLKBA and SAB/SBA control. | Suitable only for simple bidirectional buffering without data staging or timing isolation. | Choose when latency minimization is prioritized over register functionality and clock synchronization. |
| SN74ALVC164245DGGR | Higher drive strength (±24 mA @ 2.5 V); supports 2.3–3.6 V VCC; no Ioff; 56-pin TSSOP (DGG) package. | Better for high-current bus loading but incompatible with partial-power-down requirements. | Select when interfacing with heavy capacitive loads (>30 pF per line) and full-power operation is guaranteed. |
Compared with SN74LVC16245ADLR and SN74ALVC164245DGGR, the SN74LVC16646ADLR uniquely combines register staging, Ioff-enabled power management, and 5-V-tolerant inputs in a single 56-pin SSOP - making it the only option for mixed-voltage, low-power, timing-critical bus arbitration where data must be held, synchronized, and isolated across power domains.
Availability
SN74LVC16646ADLR is available at Aetrix Electronics and suitable for industrial backplane arbitration, FPGA-to-ASIC interconnect, and memory interface buffering requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74LVC16646ADLR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of innovation in high-speed interface ICs and widebus technology.
The SN74LVC16646ADLR belongs to TI's Widebus™ family - engineered specifically for high-integrity, low-latency data routing in mixed-voltage digital systems where timing predictability, power-aware operation, and bus contention control are essential.
FAQ
What is the primary function of the SN74LVC16646ADLR in a digital system?
The SN74LVC16646ADLR serves as a 16-bit registered bus transceiver that enables bidirectional data transfer between two 8-bit buses (A and B), with independent clocking, direction control, and 3-state outputs. Its core function is to synchronize, isolate, and translate data across voltage domains - for example, routing signals between a 3.3-V FPGA and 5-V peripheral while holding data in internal registers to meet timing constraints. The SN74LVC16646ADLR achieves this without external latches or level shifters.
Does the SN74LVC16646ADLR support partial power-down, and how is it implemented?
Yes, the SN74LVC16646ADLR supports partial power-down via its Ioff circuitry, which disables all outputs when VCC = 0 V - preventing damaging current backflow from live buses into the unpowered device. This feature is explicitly characterized in the datasheet with ±10 µA Ioff at 5.5 V, and applies regardless of input logic states. The SN74LVC16646ADLR maintains this behavior across its full –40°C to +85°C operating range, making it suitable for hot-swap and multi-rail power sequencing applications.
Can the SN74LVC16646ADLR operate with a 5-V supply, and what are its voltage limitations?
No, the SN74LVC16646ADLR does not operate with a 5-V supply - its VCC must be between 1.65 V and 3.6 V. However, its inputs tolerate up to 5.5 V regardless of VCC level, enabling safe interfacing with 5-V logic without external clamping. Outputs swing between GND and VCC (not 5 V), so they drive 3.3-V-compatible loads only. Exceeding 3.6 V on VCC risks permanent damage, as confirmed by the Absolute Maximum Ratings table listing 6.5 V as the absolute limit - not a recommended operating condition. The SN74LVC16646ADLR relies on this input tolerance, not supply voltage, for mixed-voltage operation.
How many clock inputs does the SN74LVC16646ADLR have, and what do they control?
The SN74LVC16646ADLR has four dedicated clock inputs: 1CLKAB, 1CLKBA, 2CLKAB, and 2CLKBA - two per 8-bit channel. Each CLKAB input captures data from the A-bus into the corresponding channel's register on its rising edge; each CLKBA input captures data from the B-bus. These clocks are asynchronous and independently controllable, allowing staggered or simultaneous registration of data across both buses. The SN74LVC16646ADLR uses these clocks exclusively for register loading - not for output enable or direction control - ensuring deterministic setup/hold timing per JEDEC standards.
What package type and dimensions does the SN74LVC16646ADLR use, and is it RoHS compliant?
The SN74LVC16646ADLR uses a 56-pin SSOP (DL) package measuring 13.9 mm × 7.5 mm with 0.5-mm lead pitch and 1.2-mm maximum height. It is RoHS compliant (lead finish: NiPdAu), moisture sensitivity level (MSL) 1, and rated for reflow up to 260°C. The part marking "LVC16646A" appears on the top surface, and the tape-and-reel packaging contains 1000 units per reel with quadrant Q1 pin-1 orientation. All mechanical and thermal data - including θJA = 56°C/W - are documented in TI's official DL package drawings referenced in SCES408B.
SN74LVC16646ADLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74LVC16646ADLR FAQ
1.How can I place an order for SN74LVC16646ADLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC16646ADLR 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 SN74LVC16646ADLR reliable?
The price and inventory of SN74LVC16646ADLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC16646ADLR is usually 5 days.
3.What payment methods are accepted for SN74LVC16646ADLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC16646ADLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC16646ADLR?
SN74LVC16646ADLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC16646ADLR 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 SN74LVC16646ADLR?
For technical support, including SN74LVC16646ADLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC16646ADLR requirements.
6.How does Aetrix verify that SN74LVC16646ADLR is sourced from the original manufacturer or authorized distributors?
All SN74LVC16646ADLR 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 SN74LVC16646ADLR meets industry standards.
7.What is the process for return or replacement of SN74LVC16646ADLR?
All SN74LVC16646ADLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC16646ADLR, 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 SN74LVC16646ADLR part is unused and in its original packaging.
Return procedure for SN74LVC16646ADLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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