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Analog Devices Inc. LTC4306CUFD#TRPBF
- Part No.:
- LTC4306CUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC4306CUFD#TRPBF.pdf
- Description:
- IC INTERFACE SPECIALIZED 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,023
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Product details
Overview
LTC4306CUFD#TRPBF from Analog Devices (formerly Linear Technology) is a 4-channel, bidirectional I²C/SMBus bus multiplexer with capacitive isolation buffers, programmable stuck-bus timeout, rise time accelerators, and independent downstream pull-up voltage support (2.2V–5.5V). It enables one upstream master to selectively connect to up to four isolated downstream I²C buses in any combination, supporting level translation and live insertion in backplane systems.
For engineers reviewing the LTC4306CUFD#TRPBF datasheet, LTC4306CUFD#TRPBF pinout, LTC4306CUFD#TRPBF application, or LTC4306CUFD#TRPBF equivalent, key selection considerations include its 24-lead QFN (4mm × 5mm) package, ±10kV HBM ESD rating, 400kHz I²C compliance, software-configurable timeout modes (7.5/15/30ms), and dual GPIOs with independent 1.5V–5.5V pull-up tolerance.
Technical Context
The LTC4306CUFD#TRPBF implements four independent N-channel FET-based bidirectional switches between an upstream SDAIN/SCLIN bus and four downstream SDA1–SDA4/SCL1–SCL4 buses, each with dedicated ALERT1–ALERT4 fault inputs. Its upstream-downstream buffer architecture enforces logic-level compatibility while isolating bus capacitance-critical for fan-out extension beyond standard I²C limits.
It integrates three-stage protection logic: (1) UVLO (2.3–2.7V threshold) holding all I/O pins high-Z until VCC stabilizes; (2) ENABLE-controlled register reset and communication disable; and (3) per-channel stuck-low detection using 0.52V internal node monitoring with programmable timeout via TIMSET1/TIMSET0 bits in Register 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 5.5V - supports mixed-voltage system integration without level-shifter ICs |
| I²C Clock Frequency | Up to 400kHz - full Fast-mode I²C compliance for high-speed sensor/microcontroller interconnect |
| Stuck-Low Timeout | Programmable: 7.5ms / 15ms / 30ms - prevents bus lockup during slave faults or wiring shorts |
| Rise Time Acceleration | 5.5mA regulated boost current - reduces SDA/SCL rise time on high-capacitance buses (>100pF) |
| ESD Rating | ±10kV HBM - robust operation in hot-plug and industrial backplane environments |
| Operating Temp | 0°C to 70°C (C-grade) - suitable for commercial and industrial control applications |
| Package | 24-lead QFN (4mm × 5mm) - compact footprint with exposed pad for thermal management |
Pinout & Package
The LTC4306CUFD#TRPBF is housed in a 24-lead plastic QFN package (4mm × 5mm) with an exposed thermal pad (Pin 25) that may be left unconnected or tied to GND to achieve θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDAIN / SCLIN | Upstream I²C Data/Clock | Bidirectional buffered interface to master-side bus; requires external pull-up |
| SDA1–SDA4 / SCL1–SCL4 | Downstream I²C Data/Clock | Four independent buffered channels; each supports independent pull-up voltage (2.2V–5.5V) |
| ALERT1–ALERT4 | Fault Input (per channel) | Open-drain inputs allowing downstream slaves to signal faults directly to host controller |
| ALERT | Fault Output | Open-drain output compliant with SMBus Alert Response Address protocol |
| ENABLE | Interface Enable / Reset | Low pulse resets registers to default state and disables I²C communication |
| GPIO1 / GPIO2 | Configurable I/O | Software-selectable as input, open-drain output, or push-pull output; 1.5V–5.5V pull-up tolerant |
| ADR0–ADR2 | I²C Address Inputs | Three-state inputs enabling 27 unique slave addresses (0x10–0x16, 0x18–0x1E, 0x20–0x26) |
| READY | Connection Status | Open-drain output pulled low when no downstream channel is connected |
Key Features
| Feature | Design Value |
|---|---|
| Nested addressing support | Enables hierarchical I²C topologies where downstream devices retain original addresses across multiplexer layers |
| Supply-independent bidirectional buffering | Allows upstream (e.g., 3.3V MCU) and downstream (e.g., 2.5V sensor) buses to coexist without external level translators |
| Programmable stuck-bus disconnect | Prevents system hang by automatically isolating faulty downstream buses after configurable timeout |
| SMBus-compatible ALERT protocol | Enables standardized fault reporting and resolution via Alert Response Address (ARA = 0x0C) without custom firmware |
| Live insertion protection | Prevents SDA/SCL corruption during hot-plug of modules by blocking invalid logic states during connection transitions |
Applications
| Server Backplane Management | Industrial Sensor Hub |
|---|---|
Use Scenario: Hot-swap SFP+ modules in telecom/datacom chassis with centralized BMC managing multiple I²C device trees. IC Role / Device Role / Timing Role: I²C bus multiplexer providing capacitive isolation and nested addressing between BMC and per-module sensors/EEPROMs. Use Value: Enables 1:4 fan-out expansion while maintaining 400kHz timing integrity and preventing cross-bus interference during live module insertion/removal. | Use Scenario: Aggregating temperature, pressure, and humidity sensors operating at different supply voltages (2.5V, 3.3V, 5V) into a single microcontroller I²C port. IC Role / Device Role / Timing Role: Voltage-level agnostic I²C switch with independent downstream pull-up support and rise-time acceleration for long traces. Use Value: Eliminates need for discrete level shifters; maintains signal integrity across mixed-voltage sensor clusters with <100ns data hold time compliance. |
| Automotive ADAS Camera Module | Medical Diagnostic Equipment |
Use Scenario: Isolating I²C communication between main ECU and multiple camera modules with independent power domains and fault reporting. IC Role / Device Role / Timing Role: Fault-aware bus switch with ALERT1–ALERT4 inputs feeding camera-specific error conditions to central controller. Use Value: Provides deterministic fault propagation (via SMBus ARA) and automatic bus isolation on stuck-low events-critical for ASIL-B functional safety compliance. | Use Scenario: Interfacing diverse medical peripherals (ECG front-end, SpO₂ sensor, display controller) to a central ARM-based host over shared I²C. IC Role / Device Role / Timing Role: Capacitance-buffered multiplexer enabling reliable multi-peripheral communication despite cumulative bus capacitance >400pF. Use Value: Maintains I²C timing margins (tHD,DATO ≥ 300ns, tSU,DAT ≥ 50ns) under high-load conditions, ensuring data integrity in life-critical diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C bus multiplexing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA9548APWR | 8-channel, no rise time accelerators, no stuck-low timeout, no GPIOs, lower ESD (4kV HBM), fixed 3.3V-only operation | Best for cost-sensitive, low-complexity fan-out where fault resilience and mixed-voltage support are not required | Select TCA9548APWR only if system lacks hot-swap requirements and operates exclusively at 3.3V |
| PCA9548ADPW | 8-channel, no programmable timeout, no rise time acceleration, no ALERT inputs, 5.5V max VCC, no GPIOs | Suitable for static, non-fault-prone I²C trees with higher channel count needs but no live-insertion or robust fault handling | Choose PCA9548ADPW when expanding to >4 downstream buses and fault reporting is handled externally |
Compared with TCA9548APWR and PCA9548ADPW, the LTC4306CUFD#TRPBF delivers superior system resilience through integrated stuck-bus recovery, SMBus ALERT protocol support, and dual GPIOs-making it essential for mission-critical, hot-pluggable, or mixed-voltage I²C architectures.
Availability
LTC4306CUFD#TRPBF is available at Aetrix Electronics and suitable for server backplane management, industrial sensor hubs, automotive ADAS camera modules, and medical diagnostic equipment requiring stable component supply and long-term lifecycle assurance.
Supply support for LTC4306CUFD#TRPBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC4306CUFD#TRPBF belongs to ADI's precision interface and signal conditioning product line, engineered specifically for robust, fault-tolerant I²C/SMBus infrastructure in demanding industrial, telecom, and medical systems.
FAQ
What is the primary function of the LTC4306CUFD#TRPBF in an I²C system?
The LTC4306CUFD#TRPBF acts as a 4-channel bidirectional I²C bus multiplexer with capacitive isolation buffers. It allows a single upstream master to selectively connect to any combination of four downstream I²C buses while preventing capacitive loading, enabling level translation, and supporting fault reporting via ALERT1–ALERT4 inputs. Its core value lies in extending I²C fan-out and enabling hot-plug capability in complex systems.
Does the LTC4306CUFD#TRPBF support mixed-voltage I²C buses?
Yes, the LTC4306CUFD#TRPBF supports independent downstream pull-up voltages from 2.2V to 5.5V-decoupled from its own VCC supply. This allows upstream devices (e.g., 3.3V microcontrollers) to communicate with downstream peripherals operating at 2.5V, 3.3V, or 5V without external level shifters, provided the logic thresholds remain compatible per the datasheet's VTH,SDA/SCL specification (0.8–1.2V).
How does the stuck-low timeout feature work in the LTC4306CUFD#TRPBF?
The LTC4306CUFD#TRPBF monitors internal nodes of downstream SDA/SCL switches for voltages below 0.52V. If sustained, a timer triggers based on TIMSET1/TIMSET0 settings (7.5ms, 15ms, or 30ms), pulling ALERT low and disconnecting affected buses. The timeout is latched in Register 0 and must be cleared by writing to Register 0 after fault resolution-ensuring persistent fault visibility until acknowledged.
Can the GPIO pins on the LTC4306CUFD#TRPBF be used as general-purpose outputs?
Yes, GPIO1 and GPIO2 on the LTC4306CUFD#TRPBF are fully configurable via Registers 1 and 2. They can operate as inputs, open-drain outputs (with 5mA sink capability), or push-pull outputs. Their voltage tolerance (1.5V–5.5V pull-up) is independent of VCC, making them suitable for driving LEDs, enabling/disabling auxiliary circuitry, or interfacing with external logic at mismatched supply levels.
Is the LTC4306CUFD#TRPBF pin-compatible with other Linear/Analog Devices I²C multiplexers?
No, the LTC4306CUFD#TRPBF is not pin-compatible with alternatives like the TCA9548A or PCA9548A. Its 24-lead QFN package, dedicated ALERT1–ALERT4 inputs, GPIOs, READY output, and ENABLE reset functionality require unique PCB layout. Migration would necessitate board revision-not just part replacement-due to differing pin functions, counts, and package dimensions.
LTC4306CUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Multiplexer with Amplifier
- Interface:
- SMBus (2-Wire/I2C)
- Voltage - Supply:
- 2.2V ~ 5.5V
- Supplier Device Package:
- 24-QFN (4x5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LTC4306CUFD#TRPBF FAQ
1.How can I place an order for LTC4306CUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4306CUFD#TRPBF 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 LTC4306CUFD#TRPBF reliable?
The price and inventory of LTC4306CUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4306CUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4306CUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4306CUFD#TRPBF transactions.
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4.How is shipping managed for LTC4306CUFD#TRPBF?
LTC4306CUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4306CUFD#TRPBF 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 LTC4306CUFD#TRPBF?
For technical support, including LTC4306CUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4306CUFD#TRPBF requirements.
6.How does Aetrix verify that LTC4306CUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4306CUFD#TRPBF 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 LTC4306CUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4306CUFD#TRPBF?
All LTC4306CUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4306CUFD#TRPBF, 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 LTC4306CUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4306CUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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