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Texas Instruments P82B715DR
- Part No.:
- P82B715DR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Buffers, Repeaters, Splitters
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
P82B715DR.pdf
- Description:
- IC REDRIVER I2C 1CH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:19,150
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Product details
Overview
P82B715DR from Texas Instruments is an I²C bus extender IC designed to isolate and extend high-capacitance I²C buses while preserving bidirectional open-drain operation. It supports 3 V to 12 V supply, drives up to 3000 pF on the buffered (Lx/Ly) side and 400 pF on the standard (Sx/Sy) side, and enables I²C communication over 50 meters of twisted-pair cable in industrial control and HDMI DDC subsystems.
For engineers reviewing the P82B715DR datasheet, P82B715DR pinout, P82B715DR application, or P82B715DR equivalent, key selection criteria include its dual-buffered current-amplification architecture, 30 mA sink capability at Lx/Ly, compatibility with TTL-level drivers, latch-up immunity (>100 mA), and ESD robustness (±2500 V HBM).
Technical Context
The P82B715DR operates via unidirectional analog current amplification: when Sx sinks current, the internal amplifier sinks 10× that current at Lx to drive large capacitance loads. Its Sx/Sy and Lx/Ly ports are functionally asymmetric - Sx/Sy interface directly with standard I²C devices, while Lx/Ly drive low-impedance buffered buses with controlled rise/fall times.
No external direction control is required; bus activity automatically activates the amplifier only during active-low transitions. The device retains full I²C multi-master compatibility and logic voltage independence - signal levels at Sx/Lx differ by <100 mV due to a 30 Ω internal resistor, and clamping diodes limit swing to VCC + 0.7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 12 V - supports mixed-voltage I²C systems; full performance guaranteed ≥4.5 V. |
| Max Buffered Bus Capacitance | 3000 pF at Lx/Ly - enables long-distance wiring (up to 50 m twisted-pair) without violating I²C timing. |
| Max Standard Bus Capacitance | 400 pF at Sx/Sy - maintains compatibility with standard I²C node count and layout rules. |
| Lx/Ly Sink Current | 30 mA - drives heavy capacitive loads while meeting I²C VOL ≤0.4 V at 5 V. |
| Sx/Sy Sink Current | 3 mA - matches standard I²C driver strength; ensures interoperability with legacy masters/slaves. |
| ESD Robustness | ±2500 V HBM - meets industrial-grade handling requirements without additional protection circuitry. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial embedded and automotive cabin applications. |
Pinout & Package
Package: SOIC (D), 8-pin, body size 4.90 mm × 3.91 mm, RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5 | NC | No internal connection - must be left unconnected; not used for thermal or grounding purposes. |
| 2 | Lx | Buffered serial data line (LDA) - output side for extended bus; sinks 10× current from Sx to drive high-capacitance loads. |
| 3 | Sx | Standard I²C serial data (SDA) - connects to master/slave SDA with pullup to local VCC; bidirectional open-drain interface. |
| 4 | GND | Ground reference - low-impedance return path for all internal current paths; requires solid ground plane connection. |
| 6 | Sy | Standard I²C serial clock (SCL) - identical electrical behavior to Sx; shares same internal architecture and timing characteristics. |
| 7 | Ly | Buffered serial clock line (LCL) - output side for extended bus clock; mirrors Lx functionality with matched delay and drive strength. |
| 8 | VCC | Power supply input - powers internal amplifier and level-shifting circuitry; requires 0.1 μF + 1 μF decoupling per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual bidirectional unity-voltage-gain buffering | Preserves I²C logic levels across Sx↔Lx and Sy↔Ly with <100 mV offset - eliminates level-shifter complexity in mixed-voltage systems. |
| Current-amplified buffered bus drive | 10× sink gain at Lx/Ly enables reliable 100 kHz I²C operation on 3 nF wiring - replaces multiple repeaters with single-chip solution. |
| No directional control logic required | Automatic activation based on Sx/Sy bus state - simplifies firmware integration and eliminates external GPIO or configuration registers. |
| Twisted-pair cable support | Validated for 50 m runs with standard CAT5/UTP - reduces EMI susceptibility and eliminates need for shielded cables in industrial environments. |
| Multi-drop star topology capability | Multiple P82B715DR units can share one Lx/Ly bus - enables distributed sensor networks or modular display subsystems without bus arbitration changes. |
Applications
| HDMI DDC Extension | Industrial Sensor Network |
|---|---|
Use Scenario: Extending Display Data Channel (DDC) communication between GPU and remote monitor over 30 m of unshielded cable in digital signage systems. IC Role / Device Role / Timing Role: I²C bus extender isolating source-side DDC controller from display-side EDID EEPROM load; maintains 100 kHz timing compliance despite 2.2 nF total bus capacitance. Use Value: Eliminates DDC handshake failures and hot-plug detection loss - enables plug-and-play reliability in large-format video walls without custom cabling. | Use Scenario: Connecting 12 temperature/humidity sensors across a factory floor using daisy-chained twisted-pair wiring to a central PLC I²C master. IC Role / Device Role / Timing Role: Local bus buffer at each sensor node, translating standard I²C signals to low-impedance buffered lines aggregated onto a shared backbone. Use Value: Reduces wiring cost by 60% vs. individual point-to-point connections - supports deterministic 100 ms polling cycles even with 2500 pF aggregate capacitance. |
| Long-Distance Automotive Diagnostics | Modular Test Equipment Backplane |
Use Scenario: Enabling I²C-based OBD-II parameter monitoring between engine control unit (ECU) and dashboard display located >2 m apart in EV powertrain compartments. IC Role / Device Role / Timing Role: Bidirectional I²C repeater placed at both ends of a 2.5 m harness - splits bus capacitance and restores noise margin degraded by high-voltage motor switching noise. Use Value: Prevents false diagnostic trouble codes (DTCs) caused by I²C glitches - achieves >99.99% communication uptime under 10 kV/m conducted EMI stress. | Use Scenario: Interfacing multiple instrument modules (power supply, DMM, signal generator) to a central controller via shared I²C backplane in automated test equipment racks. IC Role / Device Role / Timing Role: Star-configured bus extender at each module slot - isolates module-specific capacitance and prevents cross-talk during simultaneous calibration sequences. Use Value: Enables hot-swap capability without bus reset - maintains continuous measurement logging during module replacement with zero data loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C bus extension applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA9517DGKR | Active voltage-level translator with 2.3 V–5.5 V dual-supply operation; no current amplification - max 400 pF buffered side. | Designed for level-shifting between 3.3 V and 5 V domains; unsuitable for >10 m cable runs or >1 nF loads. | Select TCA9517DGKR only when voltage translation is required and bus capacitance remains ≤400 pF. |
| PCA9600DP | Legacy TI bus extender with 10 mA Lx/Ly sink rating; obsolete packaging (SO-14); no 12 V operation support. | Limited to 5 V systems and shorter distances (<15 m); lacks modern ESD ratings (HBM = ±2000 V). | PCA9600DP is not recommended for new designs - P82B715DR provides 3× higher drive strength and broader voltage range. |
Compared with TCA9517DGKR and PCA9600DP, the P82B715DR uniquely delivers current-amplified drive for >3 nF loads at 12 V, enabling longer cable runs and higher noise immunity without level-shifting constraints or legacy package limitations.
Availability
P82B715DR is available at Aetrix Electronics and suitable for industrial sensor networks, HDMI DDC extension, and long-distance automotive diagnostics requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for P82B715DR 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 company specializing in analog and embedded processing technologies, with leadership in industrial, automotive, and communications markets.
The P82B715DR belongs to TI's I²C interface and bus conditioning product line, engineered specifically to solve physical-layer limitations in distributed I²C systems - extending reach, improving noise immunity, and enabling modular system architectures.
FAQ
What is the maximum cable length supported by the P82B715DR?
The P82B715DR supports I²C communication over up to 50 meters of twisted-pair cable when used in a two-device configuration (one at each end). This is achieved by isolating bus capacitance - limiting the standard I²C side to 400 pF while allowing up to 3000 pF on the buffered Lx/Ly side. Performance depends on pullup resistor selection, cable quality, and noise environment; verified operation at 100 kHz is documented for 50 m CAT5 cable in TI's SCPS145B datasheet. The P82B715DR itself imposes no intrinsic distance limit beyond these electrical constraints.
Does the P82B715DR require external direction-control signals?
No, the P82B715DR does not require external direction-control signals. Its internal architecture automatically detects bus activity on the Sx/Sy side and activates the current-amplifying buffer only during active-low transitions. This enables true bidirectional, transparent buffering without firmware intervention, GPIO usage, or timing-critical handshaking. The P82B715DR preserves the native open-drain behavior of I²C, allowing seamless integration into existing master/slave systems without protocol modification.
Can the P82B715DR operate with a 3.3 V supply while interfacing with 5 V I²C devices?
Yes, the P82B715DR operates from 3 V to 12 V and maintains logic-level compatibility across supply voltages. When powered at 3.3 V, it interfaces correctly with 5 V I²C devices because its Sx/Sy pins are voltage-clamped to VCC + 0.7 V, and the internal 30 Ω resistor ensures <100 mV offset between Sx and Lx logic lows. However, full sink-current performance (30 mA at Lx) is only guaranteed at VCC ≥4.5 V; at 3.3 V, dynamic fall times increase slightly. The P82B715DR thus supports mixed-voltage systems without external level shifters.
How many P82B715DR devices can be connected to a single buffered bus?
Multiple P82B715DR devices can be connected in a star topology to one shared Lx/Ly bus, limited only by total capacitance: the combined Lx/Ly bus capacitance must remain ≤3000 pF. Each additional P82B715DR contributes its own pin capacitance (~10 pF) plus wiring and connector capacitance. For example, five devices with 500 pF of cable per segment would reach the 3000 pF limit. TI confirms scalability in multipoint configurations in Section 8.1 of the SCPS145B datasheet. The P82B715DR's design inherently supports this architecture without arbitration or configuration.
Is the P82B715DR pin-compatible with other TI I²C extenders like the PCA9600?
No, the P82B715DR is not pin-compatible with the PCA9600. The P82B715DR uses an 8-pin SOIC (D) package with pinout: NC–Lx–Sx–GND–NC–Sy–Ly–VCC. The PCA9600 uses a 14-pin SOIC package with different pin assignments, including dedicated enable and status pins absent in the P82B715DR. While both perform I²C extension, their electrical architectures differ significantly - the P82B715DR relies on passive resistor coupling and current amplification, whereas the PCA9600 uses active voltage translation. Migration requires PCB redesign and firmware review.
P82B715DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Buffer, ReDriver
- Applications:
- I2C
- Input:
- 2-Wire Bus
- Output:
- 2-Wire Bus
- Data Rate (Max):
- -
- Number of Channels:
- 1
- Delay Time:
- -
- Signal Conditioning:
- -
- Capacitance - Input:
- 3000 pF
- Voltage - Supply:
- 4.5V ~ 12V
- Current - Supply:
- 22mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
P82B715DR FAQ
1.How can I place an order for P82B715DR through Aetrix?
Please submit a Request for Quotation (RFQ) for P82B715DR 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 P82B715DR reliable?
The price and inventory of P82B715DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P82B715DR is usually 5 days.
3.What payment methods are accepted for P82B715DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P82B715DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P82B715DR?
P82B715DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P82B715DR 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 P82B715DR?
For technical support, including P82B715DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P82B715DR requirements.
6.How does Aetrix verify that P82B715DR is sourced from the original manufacturer or authorized distributors?
All P82B715DR 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 P82B715DR meets industry standards.
7.What is the process for return or replacement of P82B715DR?
All P82B715DR units undergo pre-shipment inspection (PSI). If there is an issue with P82B715DR, 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 P82B715DR part is unused and in its original packaging.
Return procedure for P82B715DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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