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NXP Semiconductors PCA9517D,112
- Part No.:
- PCA9517D,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Buffers, Repeaters, Splitters
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCA9517D,112.pdf
- Description:
- IC REDRIVER I2C 1CH 400KHZ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,142
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Product details
Overview
PCA9517D,112 from NXP Semiconductors is a bidirectional I²C-bus repeater IC enabling voltage-level translation between 0.9 V–5.5 V (A-side) and 2.7 V–5.5 V (B-side), with 400 pF bus capacitance isolation per side, lock-up-free operation, and support for Standard/Fast-mode I²C and SMBus protocols in mixed-voltage embedded systems.
For engineers reviewing the PCA9517D,112 datasheet, PCA9517D,112 pinout, PCA9517D,112 application, or PCA9517D,112 equivalent, key selection criteria include A/B-side supply voltage independence, 0.3VCCA input threshold for low-voltage logic compatibility, 5 V-tolerant EN/SDA/SCL pins, propagation delays under 250 ns, and SO8 package suitability for industrial bus isolation and multi-master arbitration scenarios.
Technical Context
The PCA9517D,112 implements dual open-drain bidirectional buffers with asymmetric input thresholds: A-side uses 0.3VCCA for LOW detection to accommodate sub-1.2 V logic, while B-side employs 0.4 V static offset and 0.43 V input threshold to prevent lock-up when driven by other static-offset buffers. Its power-up circuit enforces driver enable only after VCCA > 0.8 V and VCCB > 2.5 V.
Signal translation operates without clock stretching distortion or arbitration loss: a LOW on A-side (below 0.3VCCA) activates B-side pull-down to ~0.5 V; a B-side LOW below 0.4 V triggers A-side hard-ground pull-down. EN is active-HIGH with internal VCCB pull-up and requires idle-bus state transitions to avoid bus hang.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| A-side supply (VCCA) | 0.9 V to 5.5 V - enables direct interface with ultra-low-voltage logic (e.g., 0.9 V/1.2 V microcontrollers) |
| B-side supply (VCCB) | 2.7 V to 5.5 V - compatible with standard 3.3 V/5 V I²C buses and SMBus hosts |
| Max clock frequency | 400 kHz - supports Fast-mode I²C without protocol violation despite repeater delay |
| A-side VOL (IOL = 6 mA) | 0.1 V typical - ensures reliable LOW recognition by sub-1.2 V receivers |
| B-side VOL (IOL = 100 µA) | 0.52 V typical - maintains noise margin above 0.4 V B-side input threshold to prevent false LOW latching |
| Propagation delay (A→B) | 25–110 ns - enables timing-critical multi-segment bus expansion with predictable latency |
| ESD rating (HBM) | 2000 V - meets industrial I/O robustness requirements without external protection |
Pinout & Package
PCA9517D,112 is housed in an SO8 (SOT96-1) plastic small outline package, 8-lead, 3.9 mm body width, with gull-wing leads suitable for reflow soldering. Pin 1 is marked with a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-side supply input | Provides reference for 0.3VCCA input comparator; powers no internal logic-only sets threshold |
| SCLA | A-side serial clock I/O | Open-drain bidirectional node; LOW detected at <0.3VCCA to trigger B-side output |
| SDAA | A-side serial data I/O | Open-drain bidirectional node; same threshold and drive behavior as SCLA |
| GND | Ground reference | Common return for both sides; required for proper comparator biasing and ESD path |
| EN | Active-HIGH enable input | Internal VCCB pull-up; must transition only during global bus idle to prevent arbitration failure |
| SDAB | B-side serial data I/O | Open-drain bidirectional node; drives to ~0.5 V LOW; input recognizes LOW at ≤0.4 V |
| SCLB | B-side serial clock I/O | Open-drain bidirectional node; identical electrical behavior to SDAB |
| VCCB | B-side supply input | Powers all internal logic, drivers, and comparators; 5 V tolerant up to +7 V absolute max |
Key Features
| Feature | Design Value |
|---|---|
| Two independent I²C bus segments | Isolates 400 pF capacitance per side-enables longer traces or more slave devices without signal integrity loss |
| Voltage level translation | 0.9 V ↔ 2.7 V minimum swing-supports direct connection between 0.9 V SoCs and 3.3 V sensors without external level shifters |
| Lock-up free architecture | B-side 70 mV VOL–VILc margin prevents latch-up when interfacing with other static-offset buffers (e.g., PCA9515A) |
| Powered-off high-impedance I/O | All pins remain >10 MΩ when VCCA = VCCB = 0 V-enables hot-swap and partial-power-down system designs |
| Arbitration & clock stretching support | Preserves I²C protocol semantics across repeater-no master or slave sees functional difference from direct connection |
Applications
| Industrial Sensor Hub | Multi-Voltage MCU Interconnect |
|---|---|
Use Scenario: Connecting 0.9 V/1.2 V MEMS sensors to a 3.3 V industrial PLC controller over 15 cm PCB trace with 220 pF total capacitance. IC Role / Device Role / Timing Role: Bidirectional I²C repeater providing voltage translation and capacitance isolation while preserving arbitration and clock stretch transparency. Use Value: Eliminates need for discrete MOSFET level shifters and reduces BOM count; enables use of ultra-low-power sensors without compromising host-side signal integrity. |
Use Scenario: Linking a 1.8 V application processor and a 5 V power management IC on separate PCB sections with independent ground domains. IC Role / Device Role / Timing Role: Level-translating bus repeater enforcing strict 0.3VCCA input threshold and 0.5 V B-side VOL to maintain timing margins across voltage domains. Use Value: Guarantees reliable START/STOP detection and ACK timing compliance at 400 kHz despite 170 ns A→B propagation delay. |
| Star-Topology SMBus Management | Legacy-to-Modern I²C Bridge |
Use Scenario: Centralized SMBus host managing eight 3.3 V temperature monitors and two 1.2 V battery fuel gauges via shared A-side bus and individual B-side branches. IC Role / Device Role / Timing Role: A-side star hub repeater allowing concurrent communication with multiple low-voltage slaves while maintaining B-side bus independence. Use Value: Enables scalable thermal/power monitoring without bus contention; supports dynamic enable/disable per branch via individual EN control. |
Use Scenario: Integrating new 0.9 V AI accelerator module into existing 5 V automotive diagnostic subsystem using legacy I²C infrastructure. IC Role / Device Role / Timing Role: Voltage translator and bus segment isolator ensuring 5 V-tolerant EN/SDA/SCL pins withstand legacy pull-ups while delivering sub-0.2 V A-side VOL. Use Value: Avoids redesign of legacy 5 V bus layout; maintains full Fast-mode throughput and SMBus alert response timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C bus repeater applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9515AD,112 | Lacks A-side 0.3VCCA threshold; uses fixed 0.65 V B-side input threshold; no 0.9 V A-side support | Restricted to ≥1.8 V A-side logic; unsuitable for sub-1.2 V SoCs or MEMS sensors | Select PCA9517D,112 when A-side supply drops to 0.9 V or when interfacing with ultra-low-voltage peripherals. |
| TCA9517PWR | TI variant with identical pinout and function but different EN polarity (active-LOW) and 1.65–5.5 V VCCA range | Requires inverted enable logic and cannot operate below 1.65 V on A-side | Choose PCA9517D,112 for designs requiring 0.9 V A-side operation or active-HIGH enable synchronization with VCCB domain. |
Compared with PCA9515AD,112 and TCA9517PWR, the PCA9517D,112 uniquely supports 0.9 V A-side operation and active-HIGH EN with VCCB-referenced pull-up-critical for power sequencing in mixed-supply systems where VCCA ramps before VCCB.
Availability
PCA9517D,112 is available at Aetrix Electronics and suitable for industrial sensor hubs, multi-voltage MCU interconnects, star-topology SMBus management, and legacy-to-modern I²C bridging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCA9517D,112 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
NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in I²C, SMBus, and power management ICs.
The PCA9517D,112 belongs to NXP's I²C-bus repeater product line, engineered specifically for voltage-domain isolation and capacitance segmentation in resource-constrained embedded systems requiring interoperability between legacy and next-generation low-voltage peripherals.
FAQ
What is the minimum A-side supply voltage supported by the PCA9517D,112?
The PCA9517D,112 supports an A-side supply (VCCA) as low as 0.9 V, enabling direct interface with ultra-low-voltage logic such as 0.9 V ARM Cortex-M cores or MEMS sensors. This is enabled by its 0.3VCCA input threshold, which scales dynamically with VCCA to ensure reliable LOW detection even at minimum supply.
Can the PCA9517D,112 be used with a 5 V B-side and 1.2 V A-side simultaneously?
Yes-the PCA9517D,112 is explicitly designed for this configuration. With VCCB = 5 V and VCCA = 1.2 V, it translates signals bidirectionally while maintaining 0.36 V (0.3 × 1.2 V) A-side input threshold and ~0.5 V B-side output LOW level, satisfying I²C voltage-level compatibility requirements for both sides.
Does the PCA9517D,112 support clock stretching across the repeater?
Yes, the PCA9517D,112 fully preserves clock stretching behavior. When a slave holds SCL LOW on either side, the repeater propagates the condition transparently-no added delay distorts the stretched period, and arbitration remains intact because the internal comparators respond within nanoseconds to voltage transitions.
What happens to the PCA9517D,112 I/O pins when VCCA = 0 V and VCCB = 3.3 V?
When VCCA = 0 V and VCCB = 3.3 V, all PCA9517D,112 I/O pins (SDAA, SCLA, SDAB, SCLB) enter high-impedance state (>10 MΩ), while EN remains functional (internally pulled up to VCCB). This allows safe hot-plug operation of the A-side bus without disrupting the powered B-side segment.
Is the PCA9517D,112 pin-compatible with the PCA9515A series?
Yes-the PCA9517D,112 is a footprint and functional replacement for the PCA9515/15A in SO8 and TSSOP8 packages. It retains identical pinout (VCCA, SCLA, SDAA, GND, EN, SDAB, SCLB, VCCB), enabling drop-in upgrade to add 0.9 V A-side support and improved lock-up immunity without PCB redesign.
PCA9517D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Buffer, ReDriver
- Applications:
- I2C
- Input:
- 2-Wire Bus
- Output:
- 2-Wire Bus
- Data Rate (Max):
- 400kHz
- Number of Channels:
- 2
- Delay Time:
- -
- Signal Conditioning:
- -
- Capacitance - Input:
- 6 pF
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 5mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
PCA9517D,112 FAQ
1.How can I place an order for PCA9517D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9517D,112 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 PCA9517D,112 reliable?
The price and inventory of PCA9517D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9517D,112 is usually 5 days.
3.What payment methods are accepted for PCA9517D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9517D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9517D,112?
PCA9517D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9517D,112 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 PCA9517D,112?
For technical support, including PCA9517D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9517D,112 requirements.
6.How does Aetrix verify that PCA9517D,112 is sourced from the original manufacturer or authorized distributors?
All PCA9517D,112 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 PCA9517D,112 meets industry standards.
7.What is the process for return or replacement of PCA9517D,112?
All PCA9517D,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9517D,112, 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 PCA9517D,112 part is unused and in its original packaging.
Return procedure for PCA9517D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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