NXP Semiconductors PCA9510ADP,118

Overview

PCA9510ADP,118 from NXP Semiconductors is a hot-swappable I²C-bus and SMBus buffer IC designed for live insertion of I/O cards into powered backplanes. It isolates backplane and card bus capacitances, prevents data corruption during hot-swap events, and provides bidirectional SDA/SCL buffering with 1 V precharge on input pins. It operates from 2.7 V to 5.5 V and supports up to 400 kHz clock frequency in cPCI, VME, and AdvancedTCA systems.

For engineers reviewing the PCA9510ADP,118 datasheet, PCA9510ADP,118 pinout, PCA9510ADP,118 application, or PCA9510ADP,118 equivalent, this device delivers verified hot-swap readiness signaling, dynamic offset I/O compatibility across PCA9510A–14A family members, and precise 105 µs typical bus-idle-to-READY activation timing under industrial temperature range (−40 °C to +85 °C).

Technical Context

The PCA9510ADP,118 implements a dynamic offset driver architecture that enables series/parallel connection with other PCA9510A–14A devices and compatibility with the A-side of PCA9517, while explicitly excluding static-offset interfaces like PCA9515/16/18 or PCA9517 B-side. Its start-up sequence enforces high-impedance isolation until bus idle or STOP detection occurs, then connects SDAIN↔SDAOUT and SCLIN↔SCLOUT only after ENABLE is HIGH and internal references stabilize.

Unlike variants with rise-time accelerators (e.g., PCA9511A), the PCA9510ADP,118 permanently disables rise-time acceleration circuitry to prevent interference in multi-buffer systems. Its READY output is an open-drain signal asserting HIGH only when both sides are electrically connected and ENABLE is asserted, with 3 mA sink capability and 0.4 V VOL at rated load.

Key Specifications

Pinout & Package

TSSOP8 package (SOT505-1): plastic thin shrink small outline, 8-lead, 3 mm body width, lead pitch 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C bus buffering applications.

Compared with PCA9511ADP,118 and PCA9517DP,118, the PCA9510ADP,118 uniquely guarantees interference-free operation in multi-buffer stacks and eliminates rise-time accelerator-induced false edges-making it the sole choice for mission-critical hot-swap backplanes where protocol fidelity outweighs raw speed.

Availability

PCA9510ADP,118 is available at Aetrix Electronics and suitable for cPCI, VME, and AdvancedTCA backplane designs requiring stable component supply, long-term industrial lifecycle support, and guaranteed hot-swap reliability across −40 °C to +85 °C.

Supply support for PCA9510ADP,118 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface and bus technology.

The PCA9510A product line was engineered specifically for hot-swappable I²C/SMBus infrastructure in modular computing platforms, addressing the need for deterministic, capacitance-isolated, and protocol-transparent bus extension in carrier-grade systems.

FAQ

What is the primary function of the PCA9510ADP,118 in a hot-swap system?

The PCA9510ADP,118 serves as a protocol-aware I²C/SMBus buffer that isolates backplane and card bus capacitances, prevents data corruption during live insertion, and only establishes bidirectional SDA/SCL continuity after detecting bus idle or STOP conditions. Its ENABLE and READY pins provide deterministic control and status feedback, making it essential for reliable hot-swap operation in cPCI, VME, and AdvancedTCA systems. The PCA9510ADP,118 achieves this without rise-time accelerators to avoid interference in multi-device configurations.

Does the PCA9510ADP,118 support level translation between different VCC domains?

No, the PCA9510ADP,118 does not perform level translation. It operates within a single supply domain (2.7 V to 5.5 V) and buffers signals between backplane and card sides at the same logic voltage. For 3.3 V ↔ 5 V translation, NXP recommends the PCA9517DP,118 instead. The PCA9510ADP,118 maintains identical voltage thresholds and drive characteristics on both sides, ensuring timing compliance but requiring matched VCC on connected buses.

How does the READY pin behave during power-up and ENABLE assertion?

The READY pin remains LOW during power-up until the internal undervoltage lockout clears and ENABLE is asserted HIGH. After ENABLE goes HIGH, READY stays LOW for ~105 µs (typical) while the device waits for bus idle detection; it transitions HIGH only when both SDAIN/SCLIN are stable and the connection circuitry activates. If ENABLE is pulled LOW at any time, READY immediately returns LOW. The PCA9510ADP,118 drives READY as an open-drain output capable of sinking 3 mA at 0.4 V.

Can multiple PCA9510ADP,118 devices be connected in series on the same I²C bus?

Yes, but with strict limits: the PCA9510ADP,118's dynamic offset adds ~110 mV (typ) per stage at 3.3 V, and cumulative offset beyond ~0.5 V risks violating I²C LOW-level recognition thresholds. NXP recommends no more than two PCA9510ADP,118 devices in series. Unlike PCA9511A or PCA9512A, the PCA9510ADP,118 lacks a hardware disable for rise-time accelerators, so series stacking must avoid mixing with accelerator-enabled variants to prevent false edge generation.

What is the significance of the 1 V precharge on SDAIN and SCLIN pins?

The 1 V precharge minimizes transient current and logic-level disturbance when a powered card is inserted into a live backplane with opposing voltage states. By precharging SDAIN and SCLIN to 1 V via internal 100 kΩ resistors, the PCA9510ADP,118 reduces worst-case inrush current and prevents unintended START/STOP condition generation during mechanical mating. This feature is intrinsic to the PCA9510ADP,118's hot-swap robustness and is active only during initialization before connection.