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Texas Instruments SN74LVTH16646DGGR
- Part No.:
- SN74LVTH16646DGGR
- Manufacturer:
- Texas Instruments
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74LVTH16646DGGR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:151
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Product details
Overview
SN74LVTH16646DGGR from Texas Instruments is a 16-bit bus transceiver and register IC designed for 3.3-V VCC operation with 5-V tolerant inputs/outputs, supporting mixed-mode signal interfacing between 3.3-V and 5-V systems. It features dual 8-bit bidirectional data paths, clocked storage (CLKAB/CLKBA), direction control (DIR), output enable (OE), and select controls (SAB/SBA) for real-time or stored data routing. Used in high-speed backplane and motherboard bus management where voltage-level translation and data latching are required.
For engineers reviewing the SN74LVTH16646DGGR datasheet, SN74LVTH16646DGGR pinout, SN74LVTH16646DGGR application, or SN74LVTH16646DGGR equivalent, key selection considerations include its 56-pin TSSOP package, 150-MHz maximum clock frequency, bus-hold inputs eliminating external resistors, Ioff and power-up 3-state for hot insertion, and ±100 µA Ioff current at VCC = 0 V.
Technical Context
The SN74LVTH16646DGGR implements a flowthrough architecture with distributed VCC/GND pins to minimize switching noise and supports four core bus-management functions: real-time A↔B transfer, storage from A/B/both buses, and isolated stored-data routing. Its ABT (Advanced BiCMOS Technology) design enables TTL-compatible 5-V input thresholds while operating at 3.3-V VCC, with guaranteed operation down to 2.7 V.
Each of the two 8-bit sections includes independent clock (CLKAB/CLKBA), direction (DIR), output-enable (OE), and select (SAB/SBA) controls. Bus-hold circuitry maintains valid logic states on undriven A/B port inputs, and the latch-up performance exceeds 500 mA per JESD 17 - critical for industrial and telecom backplane reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and ensures compatibility with 3.3-V supply rails with margin. |
| Input Voltage Tolerance | −0.5 V to 7 V - enables direct connection to 5-V logic without level shifters, simplifying mixed-voltage system integration. |
| Max Clock Frequency | 150 MHz - allows high-throughput data transfer in fast bus architectures such as PCI-X legacy interfaces or custom parallel backplanes. |
| Ioff Current | ±100 µA at VCC = 0 V - prevents damaging backflow during hot insertion or partial power-down, meeting industrial hot-swap requirements. |
| Output Drive Strength | IOL = 64 mA, IOH = −32 mA at VCC = 3 V - drives standard TTL loads and sustains signal integrity across 10+ cm PCB traces. |
| Propagation Delay | tPLH/tPHL ≤ 4.7 ns (CL = 50 pF) - ensures sub-5-ns timing margins for synchronous 150-MHz operation with setup/hold compliance. |
| Bus-Hold Current | ±500 µA at VCC = 3.6 V - actively holds floating inputs without external pull-ups, reducing BOM count and board space. |
Pinout & Package
TSSOP-56 (DGG) package: 13.9 mm × 6.0 mm × 1.2 mm max height, 0.5-mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction Control Input | Determines data flow direction per 8-bit section: DIR = L routes B→A; DIR = H routes A→B when OE is active. |
| 1OE, 2OE | Output Enable Input | Active-low control: OE = L enables transceiver outputs; OE = H places A/B ports in high-impedance isolation mode. |
| 1CLKAB, 2CLKAB 1CLKBA, 2CLKBA |
Storage Clock Input | Low-to-high transition clocks data from A or B bus into internal registers - enables synchronized capture of asynchronous bus traffic. |
| 1SAB, 2SAB 1SBA, 2SBA |
Select Control Input | Chooses between real-time (transparent) or stored data output - eliminates multiplexer glitches during mode transitions. |
| A1–A8, B1–B8 (×2) | Data I/O Port Terminals | Two independent 8-bit bidirectional data buses with bus-hold - supports dual 8-bit or single 16-bit transceiver configurations. |
| VCC, GND (×8) | Power Distribution | Distributed VCC/GND pins reduce simultaneous switching noise and improve power integrity for high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V/3.3-V interface | Accepts 5-V TTL inputs and drives 5-V loads while powered from 3.3-V rail - eliminates need for discrete level translators in hybrid voltage systems. |
| Hot-insertion support | Ioff and power-up 3-state ensure zero current backflow and automatic high-Z outputs during power sequencing - essential for modular telecom and server backplanes. |
| Bus-hold on all A/B inputs | Eliminates external pull-up/pull-down resistors - reduces component count, PCB area, and risk of signal integrity degradation from resistor parasitics. |
| Flowthrough architecture | Minimizes trace length mismatch between control and data signals - simplifies PCB layout and improves timing closure for high-speed parallel buses. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - provides robustness against transient overvoltage events in noisy industrial environments. |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Interfacing 3.3-V FPGA-based control logic with legacy 5-V peripheral cards in a modular telecom shelf. IC Role / Device Role / Timing Role: Bidirectional voltage-translating bus transceiver with clocked storage for glitch-free handshaking between asynchronous domains. Use Value: Enables seamless integration without external level shifters or glue logic, while bus-hold prevents floating inputs during card insertion/removal. |
Use Scenario: Data exchange between 3.3-V microcontroller and 5-V analog I/O expansion modules in programmable logic controllers. IC Role / Device Role / Timing Role: Dual 8-bit register-controlled transceiver providing synchronized sampling and output staging for deterministic scan cycles. Use Value: Supports real-time and stored data modes to decouple controller processing from I/O update timing, improving scan repeatability and jitter control. |
| Test Equipment Digital Pattern Generator | Automotive Diagnostic Interface Adapter |
|
Use Scenario: Driving high-fanout 5-V test vectors from a 3.3-V pattern generator ASIC in automated test equipment. IC Role / Device Role / Timing Role: High-drive-strength (64 mA sink) transceiver with precise 150-MHz timing and sub-5-ns propagation delay. Use Value: Maintains signal edge fidelity across long ribbon cables and multiple DUT connections, reducing timing skew and false triggering. |
Use Scenario: Bridging 3.3-V automotive microcontroller diagnostics to legacy 5-V CAN/LIN physical layer transceivers in service tools. IC Role / Device Role / Timing Role: Voltage-tolerant bus buffer with Ioff protection for safe hot-plug connection to live vehicle buses. Use Value: Prevents damage during field service when adapters are connected/disconnected under power, meeting ISO 16750-2 electrical stress requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16646DGGR | Lower drive strength (IOL = 24 mA), no 5-V tolerance - requires external level shifters for 5-V systems. | Suitable only for pure 3.3-V environments; lacks mixed-mode capability and hot-insertion support. | Choose only if system operates exclusively at 3.3 V and cost is prioritized over interface flexibility. |
| SN74ALVCH16646DL | SSOP-56 package, higher speed (200 MHz), but no bus-hold and limited Ioff (±10 µA) - less robust for hot-swap. | Better for high-frequency clock domains but requires external termination and pull resistors. | Select when maximum throughput (>150 MHz) is critical and board layout accommodates external biasing. |
Compared with SN74LVC16646DGGR and SN74ALVCH16646DL, the SN74LVTH16646DGGR uniquely combines 5-V tolerance, bus-hold, Ioff-based hot insertion, and 150-MHz operation in a single TSSOP-56 device - making it optimal for mixed-voltage backplane and field-serviceable embedded systems.
Availability
SN74LVTH16646DGGR is available at Aetrix Electronics and suitable for telecom backplane interfaces, industrial PLC I/O modules, automated test equipment, and automotive diagnostic adapters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVTH16646DGGR 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 connectivity technologies, with decades of expertise in high-reliability logic and interface solutions.
The SN74LVTH16646DGGR belongs to TI's Widebus™ family of advanced bus-interface ICs, engineered specifically for voltage-level translation, noise-immune bus management, and hot-pluggable system architectures in telecom, industrial, and test equipment.
FAQ
What is the operating temperature range for the SN74LVTH16646DGGR?
The SN74LVTH16646DGGR is rated for operation from −40°C to +85°C, matching industrial-grade requirements. This range is confirmed in the official TI ordering information table and supported by thermal characterization (θJA = 64°C/W for DGG package). The device maintains full functionality across this span, including guaranteed timing and drive specifications, making it suitable for deployment in harsh ambient environments typical of factory automation and outdoor telecom infrastructure. SN74LVTH16646DGGR meets JEDEC JESD22-A104 temperature cycling standards.
Does the SN74LVTH16646DGGR support true 5-V input compatibility?
Yes, the SN74LVTH16646DGGR accepts input voltages up to 7 V (absolute max) and guarantees TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) with 5-V signals while powered at 3.3 V - enabling direct connection to legacy 5-V logic without external level shifters. This is explicitly documented in the "Recommended Operating Conditions" and "Electrical Characteristics" tables of the SCBS698G datasheet. SN74LVTH16646DGGR achieves this via ABT BiCMOS process design, not clamping diodes alone.
How does the bus-hold feature work on the SN74LVTH16646DGGR?
The SN74LVTH16646DGGR integrates active bus-hold circuitry on all A- and B-port inputs, maintaining undriven pins at their last-valid logic state with ±500 µA dynamic hold current (at VCC = 3.6 V). This eliminates the need for external pull-up or pull-down resistors, reducing BOM cost and PCB area while preventing metastability during signal transitions or connector mating. The function is enabled by default and cannot be disabled. SN74LVTH16646DGGR's bus-hold behavior is characterized across temperature and voltage per TI application report SCBA004.
Can the SN74LVTH16646DGGR be used in hot-swap applications?
Yes, the SN74LVTH16646DGGR is explicitly designed for hot-insertion use cases via two integrated features: Ioff circuitry that disables outputs and limits current to ±100 µA when VCC = 0 V, and power-up 3-state logic that forces outputs into high-impedance during power ramp-up/down. These capabilities are validated per JEDEC JESD78 and referenced in the "Features" section of the datasheet. SN74LVTH16646DGGR is deployed in carrier-grade line cards and modular servers where live module replacement is required.
What is the maximum clock frequency supported by the SN74LVTH16646DGGR?
The SN74LVTH16646DGGR supports a maximum clock frequency of 150 MHz under recommended conditions (VCC = 3.3 V ± 0.3 V, TA = 25°C, CL = 50 pF), as specified in the "Timing Requirements" table. This applies to both CLKAB and CLKBA inputs and is verified across the full industrial temperature range (−40°C to +85°C) with appropriate derating. SN74LVTH16646DGGR achieves this using low-propagation-delay ABT logic and distributed power/ground pins to suppress noise-induced timing violations.
SN74LVTH16646DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
SN74LVTH16646DGGR FAQ
1.How can I place an order for SN74LVTH16646DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH16646DGGR 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 SN74LVTH16646DGGR reliable?
The price and inventory of SN74LVTH16646DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH16646DGGR is usually 5 days.
3.What payment methods are accepted for SN74LVTH16646DGGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH16646DGGR transactions.
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4.How is shipping managed for SN74LVTH16646DGGR?
SN74LVTH16646DGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH16646DGGR 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 SN74LVTH16646DGGR?
For technical support, including SN74LVTH16646DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH16646DGGR requirements.
6.How does Aetrix verify that SN74LVTH16646DGGR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH16646DGGR 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 SN74LVTH16646DGGR meets industry standards.
7.What is the process for return or replacement of SN74LVTH16646DGGR?
All SN74LVTH16646DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH16646DGGR, 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 SN74LVTH16646DGGR part is unused and in its original packaging.
Return procedure for SN74LVTH16646DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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