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Diodes Incorporated PI6ULS5V9511BUEX
- Part No.:
- PI6ULS5V9511BUEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Signal Buffers, Repeaters, Splitters
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
PI6ULS5V9511BUEX.pdf
- Description:
- INTERFACE I2C HOT SWAP MSOP-8 T&
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
PI6ULS5V9511B from Diodes Incorporated is a hot-swappable bidirectional I²C/SMBus buffer IC designed for live insertion of I/O cards into powered backplanes. It isolates SDA/SCL bus capacitance between card and backplane sides, supports up to 400 kHz Fast Mode operation, features built-in 1.1 V pre-charge on all SDA/SCL lines, and includes active HIGH ENABLE and open-drain READY signaling. It is used in modular server chassis, telecom line cards, and industrial PLC I/O modules requiring glitch-free hot-swap capability.
For engineers reviewing the PI6ULS5V9511B datasheet, PI6ULS5V9511B pinout, PI6ULS5V9511B application, or PI6ULS5V9511B equivalent, key selection criteria include bidirectional buffering latency (tPHL ≤ 70 ns), rise-time acceleration current (Itrt(pu) = 1–2 mA), 2.7–5.5 V supply range, 4000 V HBM ESD rating, and compatibility with clock stretching and multi-master arbitration.
Technical Context
The PI6ULS5V9511B implements a dual-stage connection control architecture: an undervoltage-initiated startup sequence enforces high-impedance isolation until bus idle or STOP detection, followed by controlled bidirectional coupling. Its rise-time accelerator activates only when input voltage exceeds 0.6 V and slew rate ≥1.25 V/µs, injecting transient 2 mA pullup current to meet I²C rise-time requirements under high capacitive load.
Signal integrity is maintained via dynamic offset voltage regulation (Voffset = 110–175 mV at 3.3 V), asymmetric propagation delays (tPLH = 0 ns typ., tPHL = 70 ns max), and noise-immune falling-edge detection (threshold at 0.7×VCC with minimum 1.25 V/µs slew). READY output asserts HIGH only after ENABLE is stable HIGH and both SDA/SCL sides reach bus-idle state for ≥50 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bus Standard Support | I²C Standard Mode (100 kHz) and Fast Mode (400 kHz); fully compliant with SMBus timing and electrical specs |
| Supply Voltage Range | 2.7 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V systems without level translation |
| Pre-Charge Voltage | 1.1 V ±0.3 V on SDA/SCL pins during startup - minimizes inrush current and logic-level disturbance during hot insertion |
| Rise-Time Acceleration | 2 mA transient pullup current activated above 0.6 V - reduces rise time under 400 pF bus load while maintaining I²C tr ≤ 300 ns |
| Propagation Delay (tPHL) | 70 ns max (SCL→SCL / SDA→SDA) - ensures deterministic timing for clock stretching and arbitration synchronization |
| ESD Rating | 4000 V HBM - meets industrial-grade robustness requirements for field-replaceable module interfaces |
| ENABLE Input Threshold | VIH = 0.5×VCC min, VIL = 0.3×VCC max - provides noise margin across full VCC range and temperature |
Pinout & Package
PI6ULS5V9511B is available in MSOP-8 (U) and SOIC-8 (W) packages, both RoHS-compliant and halogen-free. Pin functions are identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENABLE (Pin 1) | Digital enable control input | Active HIGH; forces device into low-current disconnect state when LOW, enabling power-gated hot-swap sequencing |
| SCLOUT (Pin 2) | Card-side SCL bidirectional terminal | Connected to SCLIN when enabled; isolated during insertion; pre-charged to 1.1 V before connection |
| SCLIN (Pin 3) | Backplane-side SCL bidirectional terminal | Monitored for STOP/idle detection; drives SCLOUT only after bus stabilization and ENABLE assertion |
| GND (Pin 4) | Ground reference | Must connect to low-impedance ground plane to minimize noise coupling into sensitive SDA/SCL paths |
| READY (Pin 5) | Open-drain status output | Drives LOW during initialization or ENABLE=LOW; pulls HIGH only after successful connection and bus-idle confirmation |
| SDAIN (Pin 6) | Backplane-side SDA bidirectional terminal | Used for STOP detection and arbitration monitoring; electrically isolated from SDAOUT until READY asserts |
| SDAOUT (Pin 7) | Card-side SDA bidirectional terminal | Reflects SDAIN logic only after connection; supports clock stretching and ACK/NACK handshaking |
| VCC (Pin 8) | Power supply input | Supplies internal regulators, pre-charge circuitry, and rise-time accelerators; must be stable before ENABLE activation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional capacitance isolation | Separates card-side and backplane-side bus capacitance - limits effective load seen by master to <10 pF per buffer |
| Dynamic offset voltage control | Voffset = 110–175 mV at 3.3 V - prevents false clock edges during multi-buffer cascading while preserving signal integrity |
| Controlled connection sequencing | Enables coupling only after bus-idle or STOP condition - eliminates contention during live insertion/removal |
| 1.1 V pre-charge circuitry | Charges SDA/SCL pins via 100 kΩ internal resistors - reduces worst-case inrush current by >80% vs. unbuffered hot-swap |
| Open-drain READY signaling | Provides system-level handshake for FPGA/CPU firmware - confirms safe connection before initiating I²C transactions |
Applications
| Modular Server Backplane | Industrial PLC I/O Carrier |
|---|---|
Use Scenario: Hot-plug I/O expansion cards into a powered 19-inch rack-mounted server chassis with shared I²C management bus. IC Role / Device Role / Timing Role: Bidirectional bus buffer that isolates card capacitance from backplane, enabling safe insertion without disrupting BMC or PMBus communication. Use Value: Eliminates need for manual power cycling; maintains I²C timing compliance (tr ≤ 300 ns) despite adding up to 150 pF per card. |
Use Scenario: Field-replaceable analog/digital I/O modules mounted on DIN-rail carriers with centralized controller over SMBus. IC Role / Device Role / Timing Role: Hot-swap interface between controller's SMBus and module-local sensors/actuators, supporting clock stretching for slow ADC reads. Use Value: Enables maintenance without shutting down entire control system; READY signal synchronizes firmware enumeration with physical connection. |
| Telecom Line Card Shelf | Automotive Diagnostic Gateway Module |
Use Scenario: Insertion of serviceable line cards into live central office switching shelves using I²C for EEPROM configuration and temperature monitoring. IC Role / Device Role / Timing Role: Isolates card-side I²C peripherals from shelf backplane, preventing bus lock-up during mechanical mating. Use Value: Guarantees tPHL ≤ 70 ns propagation delay for reliable ACK/NACK timing even with 400 pF total bus load. |
Use Scenario: Integration of diagnostic sub-modules (e.g., CAN transceiver config, sensor calibration EEPROM) into vehicle gateway ECUs with hot-swap-capable daughterboards. IC Role / Device Role / Timing Role: I²C buffer enabling firmware updates and parameter loading without ignition cycle interruption. Use Value: Pre-charge and READY handshake prevent voltage glitches on shared 3.3 V I²C bus during connector engagement under automotive EMI conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C hot-swap buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA9517A | Single-channel, no READY output; lacks pre-charge; supports only 1.65–5.5 V; no built-in rise-time accelerator | Requires external pullup optimization; not suitable for high-capacitance hot-swap where inrush control is critical | Select when cost sensitivity outweighs need for guaranteed glitch-free insertion and READY handshake. |
| PCA9515A | Two-channel, no ENABLE/READY; fixed 2.3–3.6 V supply; no pre-charge; lower ESD (2000 V HBM) | Limited to low-voltage embedded systems; cannot support 5 V backplanes or automotive 12 V-derived 5 V rails | Choose only for space-constrained 3.3 V-only designs where hot-swap robustness is secondary to footprint. |
Compared with TCA9517A and PCA9515A, PI6ULS5V9511B uniquely delivers integrated pre-charge, READY status feedback, and 2 mA rise-time acceleration - making it the only option qualified for high-reliability hot-swap in mixed-voltage, high-capacitance backplane environments.
Availability
PI6ULS5V9511B is available at Aetrix Electronics and suitable for modular server backplanes, industrial PLC I/O carriers, telecom line card shelves, and automotive diagnostic gateway modules requiring stable component supply across extended product lifecycles.
Supply support for PI6ULS5V9511B 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability interface, power management, and signal integrity solutions for industrial, computing, and communications markets.
The PI6ULS5V9511B belongs to Diodes' Ultra-Low Skew (ULS) I²C buffer family, engineered specifically for hot-pluggable system architectures where bus integrity during live insertion must be guaranteed without firmware intervention.
FAQ
What is the purpose of the 1.1 V pre-charge on SDA and SCL pins?
The 1.1 V pre-charge minimizes inrush current during hot insertion by bringing SDA and SCL pins to a known intermediate voltage before connection. This avoids large transient currents that could cause logic glitches or damage when card and backplane operate at different voltage states, especially critical in high-density backplane systems with multiple parallel buffers.
How does the READY output behave during hot insertion?
READY remains LOW during power-up and until ENABLE is asserted HIGH and both SDA/SCL sides detect bus idle or a STOP condition. It transitions HIGH only after successful connection, providing a hardware-confirmed handshake for system firmware to safely initiate I²C transactions-eliminating race conditions between physical mating and software enumeration.
Can PI6ULS5V9511B support clock stretching and multi-master arbitration?
Yes. The device preserves clock stretching by allowing slave devices to hold SCL LOW on either side, with bidirectional propagation of the stretched state. It also supports multi-master arbitration because its internal logic passes START/STOP conditions and ACK/NACK signals transparently, maintaining I²C protocol integrity across both sides of the buffer.
What is the maximum recommended number of PI6ULS5V9511B devices in series on one I²C bus?
Diodes recommends limiting cascaded PI6ULS5V9511B devices to two per bus segment. Each adds ~110–175 mV dynamic offset voltage; beyond two buffers, cumulative offset risks violating I²C rising-edge accelerator thresholds (~0.6 V), potentially causing false clock edges or setup-time violations in 400 kHz Fast Mode operation.
PI6ULS5V9511BUEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Buffer, Accelerator
- Applications:
- I2C - Hotswap
- Input:
- -
- Output:
- 2-Wire Bus
- Data Rate (Max):
- 400kHz
- Number of Channels:
- 1
- Delay Time:
- 70ns
- Signal Conditioning:
- -
- Capacitance - Input:
- 7 pF
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 2.8mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
PI6ULS5V9511BUEX FAQ
1.How can I place an order for PI6ULS5V9511BUEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI6ULS5V9511BUEX 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 PI6ULS5V9511BUEX reliable?
The price and inventory of PI6ULS5V9511BUEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI6ULS5V9511BUEX is usually 5 days.
3.What payment methods are accepted for PI6ULS5V9511BUEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI6ULS5V9511BUEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI6ULS5V9511BUEX?
PI6ULS5V9511BUEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI6ULS5V9511BUEX 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 PI6ULS5V9511BUEX?
For technical support, including PI6ULS5V9511BUEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI6ULS5V9511BUEX requirements.
6.How does Aetrix verify that PI6ULS5V9511BUEX is sourced from the original manufacturer or authorized distributors?
All PI6ULS5V9511BUEX 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 PI6ULS5V9511BUEX meets industry standards.
7.What is the process for return or replacement of PI6ULS5V9511BUEX?
All PI6ULS5V9511BUEX units undergo pre-shipment inspection (PSI). If there is an issue with PI6ULS5V9511BUEX, 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 PI6ULS5V9511BUEX part is unused and in its original packaging.
Return procedure for PI6ULS5V9511BUEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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