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Texas Instruments SN74AVC16646DGG
- Part No.:
- SN74AVC16646DGG
- Manufacturer:
- Texas Instruments
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74AVC16646DGG.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,121
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Product details
Overview
SN74AVC16646DGG from Texas Instruments is a 16-bit bus transceiver and register with 3-state outputs, designed for mixed-voltage-mode data communications between 1.2-V to 3.6-V domains. It features Dynamic Output Control (DOC™) for noise reduction without speed degradation, Ioff support for partial-power-down mode, and operates across –40°C to 85°C. Used in high-speed memory interfaces and FPGA-to-ASIC interconnects requiring bidirectional data flow with storage capability.
For engineers reviewing the SN74AVC16646DGG datasheet, SN74AVC16646DGG pinout, SN74AVC16646DGG application, or SN74AVC16646DGG equivalent, key selection criteria include its dual 8-bit register/transceiver architecture, ±24 mA dynamic drive at 3.3 V, overvoltage-tolerant I/Os up to 4.6 V, and TSSOP-56 package compatibility with JEDEC MO-153.
Technical Context
The SN74AVC16646DGG implements two independent 8-bit transceiver/register blocks, each with separate clock inputs (CLKAB/CLKBA), direction control (DIR), output enable (OE), and select-control (SAB/SBA) signals. Its DOC™ circuit dynamically modulates output impedance during signal transitions-initially lowering it for strong drive, then raising it to suppress ringing and crosstalk.
It supports true bidirectional operation with real-time or stored data routing: DIR selects bus direction, OE enables/disables outputs, and SAB/SBA multiplexes between live and registered data. The Ioff feature disables outputs and prevents backflow current when VCC = 0 V, enabling safe hot-insertion in powered-backplane systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.2 V to 3.6 V - Enables interoperability across 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V logic domains. |
| Dynamic Drive | ±24 mA at 3.3 V - Matches standard-output strength while maintaining low-noise switching via DOC™. |
| Max Clock Frequency | 350 MHz at 3.3 V - Supports high-throughput data transfers in DDR memory buffers and processor buses. |
| Ioff Current | ±10 µA at 3.6 V - Ensures isolation during partial power-down, preventing damage from backflow in multi-rail systems. |
| Propagation Delay | 2.6 ns typical at 3.3 V - Delivers sub-3 ns timing for synchronous bus handshaking in real-time control applications. |
| Input Voltage Range | –0.5 V to 4.6 V - Allows overvoltage-tolerant interfacing with legacy 5-V peripherals without level shifters. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded systems including motor drives and PLCs. |
Pinout & Package
SN74AVC16646DGG uses a 56-pin Thin Shrink Small-Outline Package (TSSOP, DGG), JEDEC MO-153 compliant, with 0.5-mm pitch, 13.9–14.1 mm body width, and 7.7–7.9 mm body length. Pin 1 is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Selects data flow direction per 8-bit block: low = B→A, high = A→B. |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register clock input | Low-to-high transition latches data from A or B bus into respective register. |
| 1SAB, 2SAB, 1SBA, 2SBA | Select control input | Chooses between real-time (transparent) or stored data on output bus. |
| 1OE, 2OE | Output enable input | Active-low control: high = 3-state (high-Z), low = enabled output driver. |
| A1–A8, B1–B8 (×2) | Bidirectional data I/O | 16 total I/O pins split into two 8-bit buses; tolerate voltages beyond VCC (up to 4.6 V). |
| VCC, GND (×8) | Power supply terminals | Distributed VCC/GND pairs minimize switching noise and improve signal integrity across wide bus. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Output Control (DOC™) | Reduces simultaneous switching noise by 30% vs fixed-drive transceivers while preserving 350-MHz timing margin. |
| Ioff Partial-Power-Down Support | Enables safe insertion/removal in live backplanes by blocking current flow when VCC = 0 V. |
| Mixed-Voltage Interoperability | Accepts 0–4.6 V inputs and drives 1.2–3.6 V outputs, eliminating external level translators in heterogeneous SoC interfaces. |
| Glitch-Free Multiplexing | Select-control logic prevents decoding glitches during transitions between stored and real-time data paths. |
| Widebus™ Architecture | Optimized layout and EPIC™ submicron CMOS process deliver consistent timing skew <0.3 ns across all 16 bits. |
Applications
| Memory Interface Buffer | FPGA-to-ASIC Interconnect |
|---|---|
Use Scenario: Bidirectional data transfer between DDR2 SDRAM and memory controller with cycle-accurate timing alignment. IC Role / Device Role / Timing Role: Acts as registered transceiver buffering address/data/control lines, absorbing setup/hold timing violations via internal clocked registers. Use Value: Enables reliable 350-MHz operation at 3.3 V while reducing board-level EMI through DOC™-driven edge shaping. |
Use Scenario: High-speed parallel interface between Xilinx Artix FPGA and custom ASIC implementing PCIe endpoint logic. IC Role / Device Role / Timing Role: Provides voltage translation (1.8 V FPGA ↔ 2.5 V ASIC), direction control, and data staging to decouple clock domains. Use Value: Eliminates need for discrete level shifters and glue logic, cutting BOM cost by $0.42/unit and saving 28 mm² PCB area. |
| Industrial Backplane Hub | Test Equipment Data Mux |
Use Scenario: Hot-pluggable module interface in programmable logic controller (PLC) backplane supporting multiple I/O cards. IC Role / Device Role / Timing Role: Isolates card-side signals during insertion using Ioff, then enables controlled data exchange via DIR/OE sequencing. Use Value: Prevents system reset or bus contention during field maintenance, meeting IEC 61000-4-2 Level 4 ESD immunity requirements. |
Use Scenario: Signal routing matrix in automated test equipment (ATE) switching between DUT pins and measurement instruments. IC Role / Device Role / Timing Role: Stores test patterns in internal registers and routes them synchronously to DUT under precise CLKAB/CLKBA control. Use Value: Achieves <1 ns inter-channel skew across 16-bit pattern generation, improving test repeatability for high-speed SerDes validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC16835DGGR | 18-bit universal bus transceiver with no internal registers; lacks CLKAB/CLKBA and SAB/SBA functionality. | Suitable only for transparent (non-storing) bidirectional data flow; cannot replace registered operation. | Select only if application requires wider bus width and does not need data storage or multiplexed routing. |
| SN74LVC16646DGGR | Same pinout and function but LVC family: lower drive (±24 mA only at 3.3 V), no DOC™, no Ioff, narrower VCC range (1.65–3.6 V). | Lacks overvoltage tolerance and partial-power-down capability; unsuitable for mixed-voltage or hot-swap systems. | Choose only for cost-sensitive designs operating strictly at 3.3 V with no requirement for 1.2–1.8 V compatibility or Ioff protection. |
Compared with SN74AVC16646DGG, SN74AVC16835DGGR omits register functionality entirely, while SN74LVC16646DGGR sacrifices DOC™ noise suppression, Ioff safety, and sub-1.65-V operation-making SN74AVC16646DGG the sole option for robust mixed-voltage, hot-plug, or low-voltage industrial designs.
Availability
SN74AVC16646DGG is available at Aetrix Electronics and suitable for industrial automation, FPGA prototyping, and memory subsystem design requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for SN74AVC16646DGG 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 over 50 years of innovation in high-reliability interface ICs.
The SN74AVC16646DGG belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered for ultra-low-voltage, high-speed bidirectional bus management in space-constrained, multi-rail digital systems.
FAQ
What is the minimum VCC required for functional operation of the SN74AVC16646DGG?
The SN74AVC16646DGG is fully specified down to 1.2 V VCC, with guaranteed timing and DC parameters across the full –40°C to +85°C temperature range. At 1.2 V, maximum clock frequency drops to 150 MHz, and VOL/VOL specifications remain valid per the Electrical Characteristics table. Operation below 1.2 V is not characterized and may result in undefined behavior or latch-up.
Does the SN74AVC16646DGG support hot-plug operation, and how is it implemented?
Yes, the SN74AVC16646DGG supports hot-plug operation via its Ioff circuitry. When VCC = 0 V, the Ioff feature disables all outputs and limits leakage current to ±10 µA, preventing damaging backflow current from live backplane traces. This allows safe insertion/removal in powered systems without disrupting adjacent modules or triggering system resets.
How does the Dynamic Output Control (DOC™) circuit in the SN74AVC16646DGG reduce noise without degrading speed?
The DOC™ circuit in the SN74AVC16646DGG dynamically adjusts output impedance: it starts low (enabling fast edge rates and strong drive) during signal transition onset, then increases mid-transition to damp ringing and suppress crosstalk. This preserves propagation delay (2.6 ns typical at 3.3 V) while cutting simultaneous switching noise by up to 30% compared to fixed-drive transceivers.
Can the SN74AVC16646DGG be used as two independent 8-bit transceivers, and what control signals are required?
Yes, the SN74AVC16646DGG can operate as two independent 8-bit transceivers. Each half uses dedicated control signals: 1DIR/1CLKAB/1SAB/1OE for the first 8-bit block (A1–A8/B1–B8), and 2DIR/2CLKAB/2SAB/2OE for the second (A9–A16/B9–B16). No shared control is required, enabling asynchronous operation of both channels.
What is the absolute maximum input voltage rating for the SN74AVC16646DGG, and does it apply to all pins?
The absolute maximum input voltage for all I/O pins of the SN74AVC16646DGG is –0.5 V to 4.6 V, regardless of VCC state. This overvoltage tolerance applies to A/B bus pins, DIR, OE, CLK, and SAB/SBA inputs. Exceeding these limits-even briefly-may cause permanent damage, as defined in the Absolute Maximum Ratings table on page 7 of the datasheet.
SN74AVC16646DGG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Bulk
- 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:
- 12mA, 12mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
SN74AVC16646DGG FAQ
1.How can I place an order for SN74AVC16646DGG through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC16646DGG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74AVC16646DGG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC16646DGG is usually 5 days.
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Once your SN74AVC16646DGG 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 SN74AVC16646DGG?
For technical support, including SN74AVC16646DGG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC16646DGG requirements.
6.How does Aetrix verify that SN74AVC16646DGG is sourced from the original manufacturer or authorized distributors?
All SN74AVC16646DGG 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 SN74AVC16646DGG meets industry standards.
7.What is the process for return or replacement of SN74AVC16646DGG?
All SN74AVC16646DGG units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC16646DGG, 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 SN74AVC16646DGG part is unused and in its original packaging.
Return procedure for SN74AVC16646DGG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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