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Analog Devices Inc. LTC4331CUFD#TRPBF
- Part No.:
- LTC4331CUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized ICs
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4331CUFD#TRPBF.pdf
- Description:
- IC DIFFERENTIAL LINK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,858
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Product details
Overview
LTC4331CUFD#TRPBF from Analog Devices is an SMBus 3.0–compatible I2C slave device extender IC designed for high-noise industrial environments. It extends I2C/SMBus communication-including SCL, SDA, SMBALERT, and CTRL-over a single twisted-pair differential link up to 1200 m using ±60 V fault-protected transceivers, supports Fast-mode Plus (1 MHz) local bus operation, and features ±15 V extended common mode range for ground potential tolerance.
For engineers reviewing the LTC4331CUFD#TRPBF datasheet, LTC4331CUFD#TRPBF pinout, LTC4331CUFD#TRPBF application, or LTC4331CUFD#TRPBF equivalent, key selection considerations include differential link baud rate configuration (via SPEED1/SPEED2), remote/local mode control (REMOTE pin), slew rate limiting (SLO), ±40 kV ESD protection on link pins, and transparent bridging with independent local/remote bus timing.
Technical Context
The LTC4331CUFD#TRPBF implements a bidirectional, packetized I2C-to-differential-link protocol using an internal RS485-compliant transceiver with ±60 V fault protection and ±15 V common mode range. It operates in two mutually exclusive modes: local (REMOTE = 0) as an addressable SMBus slave with configurable I2C timing (Fm+, Fm, Sm), and remote (REMOTE = 1) as a master that mirrors local transactions on the extended bus.
Link timing is determined by SPEED1/SPEED2 pin states (9 selectable speed indices), while SLO enables slew-rate-limited transmission for EMI reduction-valid only for Speed Indices 0–1. Clock-stretching is used to absorb remote latency, requiring full SCL clock-stretching support from the local master controller.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local I2C Bus Speed | Up to 1000 kHz Fast-mode Plus (Fm+); enables high-speed sensor/control interface at host side |
| Differential Link Range | Up to 1200 m over twisted pair; supports long-haul industrial fieldbus extension |
| Fault Protection | ±60 V on A/B pins; prevents damage from line surges or ground faults in harsh environments |
| ESD Rating | ±40 kV HBM on A/B; meets IEC 61000-4-2 Level 4 (±8 kV contact) for robust system-level immunity |
| Common Mode Range | ±15 V; accommodates large ground potential differences between nodes without data corruption |
| Supply Voltage Range | VCC: 3 V to 5.5 V; VL: 1.62 V to 5.5 V; supports mixed-voltage system integration |
| Operating Temperature | 0°C to 70°C (C-grade); suitable for commercial and controlled industrial ambient conditions |
Pinout & Package
Package: 20-lead (4 mm × 5 mm) plastic QFN with exposed pad (Pin 21 = GND). Requires soldering of exposed pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (1) | Primary supply input | 3–5.5 V power for core logic and drivers; requires 4.7 µF ceramic bypass to GND |
| VL (2) | Logic I/O supply reference | 1.62–5.5 V supply for SCL/SDA/ALERT/CTRL I/O levels; bypass with 1 µF ceramic |
| ON (3) | Enable control | Active-high enable; low disables outputs and forces internal reset for ultra-low-power standby |
| REMOTE (4) | Mode select | Low = local slave mode; high = remote master mode; weakly pulled to GND internally |
| LINK (5) | Open-drain status output | Drives low when link established; valid only in paired local/remote configuration |
| RDY (6) | I2C interface ready indicator | Open-drain output pulled low after I2C interface joins bus; used for firmware synchronization |
| SCL (7) | I2C serial clock | Bi-directional, open-drain; connects to external pull-up; supports clock-stretching |
| SDA (8) | I2C serial data | Bi-directional, open-drain; connects to external pull-up; handles ACK/NACK propagation |
| A1/A2 (11/12) | I2C slave address select | 3-state inputs selecting one of eight internal slave addresses; float to disable control interface |
| CTRL (13) | Bidirectional control signal | Propagates level across link; used for GPIO-like remote control or status signaling |
| SPEED1/SPEED2 (14/15) | Link baud rate config | 3-state inputs selecting one of nine differential link speeds (Index 0–8); must match on both ends |
| SLO (17) | Slew rate control | Low enables reduced EMI transmission; restricts valid SPEED indices to 0 or 1 only |
| A (18), B (19) | Differential transceiver | RS485-compliant ±60 V fault-tolerant pair; requires 110 Ω termination at each end |
Key Features
| Feature | Design Value |
|---|---|
| Transparent I2C extension | Requires no firmware changes on master; remote slaves appear as local devices with standard I2C addressing |
| Independent local/remote bus timing | Enables Fm+ (1 MHz) local bus while remote bus runs at Fm or Sm for compatibility with legacy sensors |
| Stuck bus and idle detection | Automatically recovers from hung buses and detects idle state to prevent false timeouts or lockups |
| Remote interrupt forwarding | SMBALERT signal propagates end-to-end with sub-microsecond latency (0.8×SF to 26×SF) |
| Configurable link speed | Nine baud rates via SPEED1/SPEED2 allow optimization of cable length vs. throughput (e.g., 1200 m @ Index 0) |
| Low EMI operation | SLO pin enables slew-rate limiting to meet CISPR 22/32 Class B emissions requirements in sensitive applications |
Applications
| Industrial Sensor Networks | Building Automation Systems |
|---|---|
Use Scenario: Distributed temperature, pressure, and humidity sensors deployed across factory floors or HVAC ducts spanning >300 m. IC Role / Device Role / Timing Role: LTC4331CUFD#TRPBF acts as local slave extender at controller node and remote master at sensor node, enabling centralized polling over twisted pair. Use Value: Eliminates need for repeaters or protocol gateways; maintains native I2C timing integrity while tolerating ±15 V ground offsets between zones. |
Use Scenario: Lighting control panels communicating with remote dimmers, occupancy sensors, and thermostats in multi-floor commercial buildings. IC Role / Device Role / Timing Role: LTC4331CUFD#TRPBF bridges building management system (BMS) controller I2C bus to distributed endpoints via CAT5 cabling. Use Value: Supports 1 MHz local bus for fast panel updates while extending reliable SMBus ALERT signaling for fault reporting across 1200 m runs. |
| Factory Floor I/O Modules | Medical Equipment Interconnect |
Use Scenario: Modular PLC I/O racks with analog/digital modules located meters away from CPU chassis in electrically noisy machinery areas. IC Role / Device Role / Timing Role: LTC4331CUFD#TRPBF serves as local extender at CPU side and remote master at I/O rack, handling register reads/writes and interrupt alerts. Use Value: ±60 V fault protection prevents latch-up during motor drive switching transients; ±40 kV ESD withstand ensures reliability during maintenance handling. |
Use Scenario: Patient monitor systems integrating bedside sensors (ECG, SpO₂) with central display units across isolation barriers or shielded rooms. IC Role / Device Role / Timing Role: LTC4331CUFD#TRPBF provides galvanically isolated I2C extension using differential signaling, preserving signal integrity without optocouplers. Use Value: Extended common mode range eliminates ground loop errors; SMBus 3.0 compliance ensures interoperability with medical-grade sensor ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I2C bus extension applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP PCA9615DP | Single-ended I2C repeater (not differential); max 20 m range; no ±60 V fault protection; no remote master mode | Suitable only for short-distance noise mitigation within same enclosure; lacks long-haul or ground-isolation capability | Choose PCA9615DP only for intra-chassis I2C buffering where differential signaling and fault tolerance are unnecessary. |
| Texas Instruments TCA9517DGKR | Bi-directional I2C buffer with level shifting; no differential physical layer; limited to ~1 m; no link control or ALERT forwarding | Designed for voltage translation between 1.8 V and 5 V domains-not for noise immunity or distance extension | Select TCA9517DGKR when interfacing mixed-voltage I2C peripherals on same PCB, not for field wiring extension. |
Compared with PCA9615DP and TCA9517DGKR, the LTC4331CUFD#TRPBF uniquely delivers true differential long-haul extension (1200 m), ±60 V fault resilience, and dual-mode (local slave + remote master) operation-making it the only option for robust industrial I2C field networks requiring ground isolation and ESD-hardened links.
Availability
LTC4331CUFD#TRPBF is available at Aetrix Electronics and suitable for industrial sensor networks, building automation systems, factory floor I/O modules, and medical equipment interconnect requiring stable component supply across extended product lifecycles.
Supply support for LTC4331CUFD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and healthcare markets.
The LTC4331CUFD#TRPBF belongs to Analog Devices' Signal Conditioning and Interface portfolio, specifically engineered to solve I2C reliability challenges in electrically hostile, long-distance industrial deployments.
FAQ
What is the maximum supported cable length for LTC4331CUFD#TRPBF?
The LTC4331CUFD#TRPBF supports up to 1200 m over twisted-pair cable when configured at Speed Index 0 (lowest baud rate). Achievable length decreases with higher SPEED1/SPEED2 settings-e.g., ~30 m at Index 8 (highest rate). Cable quality, termination (110 Ω), and noise environment also affect practical reach. The LTC4331CUFD#TRPBF datasheet specifies timing margins and link integrity thresholds per index.
Does LTC4331CUFD#TRPBF require matching SPEED1/SPEED2 configurations on both ends of the link?
Yes-both LTC4331CUFD#TRPBF devices in a point-to-point link must use identical SPEED1 and SPEED2 pin states to ensure synchronized baud rate and packet framing. Mismatched settings cause complete link failure with no fallback negotiation. The LTC4331CUFD#TRPBF does not auto-detect or adapt link speed; configuration is static and hardware-pin-driven.
Can LTC4331CUFD#TRPBF operate without an external pull-up on SCL/SDA?
No-SCL and SDA pins are open-drain and require external pull-up resistors to VL (typically 2.2–10 kΩ). Omitting pull-ups prevents proper I2C signaling, resulting in bus lockup or non-functional communication. The LTC4331CUFD#TRPBF internal circuitry relies on externally established high states for START/STOP detection and data sampling.
Is the ALERT signal bidirectional across the LTC4331CUFD#TRPBF link?
Yes-the ALERT pin functions as an SMBALERT output on the local side and as an input on the remote side, with active-low assertion propagated end-to-end with deterministic latency (0.8×SF to 26×SF). This allows remote sensor interrupts to trigger immediate host MCU responses via the local ALERT line. The LTC4331CUFD#TRPBF supports both level- and edge-sensitive interrupt modes via register configuration.
What happens if the local I2C master does not support clock-stretching?
If the local master ignores or terminates SCL stretching by the LTC4331CUFD#TRPBF, read transactions will fail-data bytes will be corrupted or lost due to unmet timing constraints. The LTC4331CUFD#TRPBF uses clock-stretching to absorb remote bus latency and differential link propagation delay. Analog Devices explicitly recommends masters with full clock-stretching compliance for reliable operation.
LTC4331CUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Differential Link
- Applications:
- Industrial, Lighting
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x5)
- Grade:
- -
- Qualification:
- -
LTC4331CUFD#TRPBF FAQ
1.How can I place an order for LTC4331CUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4331CUFD#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 LTC4331CUFD#TRPBF reliable?
The price and inventory of LTC4331CUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4331CUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4331CUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4331CUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4331CUFD#TRPBF?
LTC4331CUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4331CUFD#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 LTC4331CUFD#TRPBF?
For technical support, including LTC4331CUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4331CUFD#TRPBF requirements.
6.How does Aetrix verify that LTC4331CUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4331CUFD#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 LTC4331CUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4331CUFD#TRPBF?
All LTC4331CUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4331CUFD#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 LTC4331CUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4331CUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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