NXP Semiconductors PCA9513D,112

Overview

The PCA9513D,112 from NXP Semiconductors (formerly Philips) is a hot-swappable I²C and SMBus bus buffer IC designed for backplane-to-card isolation in live-insertion systems. It provides bidirectional SDA/SCL buffering with 92 µA integrated current sources on SCLIN/SDAIN, 0.8 V rise-time accelerator threshold, 2.7–5.5 V operation, and open-drain READY output-enabling safe cPCI/VME card insertion without bus corruption.

For engineers reviewing the PCA9513D,112 datasheet, PCA9513D,112 pinout, PCA9513D,112 application, or PCA9513D,112 equivalent, this device is selected for PICMG-compliant hot-swap I²C infrastructure where dynamic capacitance isolation, stop/idle detection, and low-current disable are critical design requirements.

Technical Context

The PCA9513D,112 implements a dynamic offset driver architecture enabling series/parallel cascading with other PCA951x devices (excluding PCA9515/16/17 B-side). Its connection logic waits for bus idle (≥50 µs) or STOP condition before enabling bidirectional conduction between backplane (SCLIN/SDAIN) and card (SCLOUT/SDAOUT) sides.

Rise time acceleration activates at 0.8 V on SDA/SCL lines with 2 mA transient pull-up current, improving noise margin over earlier 0.6 V threshold devices. The ENABLE input controls initialization timing (130 µs), while READY indicates connection status with open-drain output sinking 3 mA at ≤0.4 V.

Key Specifications

Pinout & Package

PCA9513D,112 is housed in an 8-pin plastic SO package (SOT96-1), 3.9 mm body width, suitable for standard PCB assembly and thermal management in industrial backplanes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCA9514D,112 and TCA9513PWR, the PCA9513D,112 uniquely delivers integrated 92 µA pull-ups for PICMG compliance and a READY signal for deterministic connection state feedback-making it the sole choice for standards-constrained hot-swap backplanes requiring both features.

Availability

PCA9513D,112 is available at Aetrix Electronics and suitable for CompactPCI, VME, and AdvancedTCA systems requiring stable component supply, long-term lifecycle support, and guaranteed hot-swap I²C integrity.

Supply support for PCA9513D,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 leader delivering secure, scalable solutions for automotive, industrial, and IoT applications, with deep heritage in I²C interface technology originating from Philips.

The PCA9513D,112 belongs to NXP's legacy I²C bus buffer family engineered specifically for high-reliability hot-swap backplane architectures in telecom, defense, and industrial computing systems.

FAQ

What is the purpose of the 92 µA current source in PCA9513D,112?

The 92 µA current source on SCLIN and SDAIN of the PCA9513D,112 replaces external pull-up resistors in PICMG backplane applications. It ensures consistent RC time constants during card insertion/removal, eliminates variability from resistor tolerances and trace parasitics, and maintains I²C rise-time compliance across dynamic system configurations. This feature is exclusive to PCA9513D,112 and not present in PCA9514D,112.

How does the READY pin indicate connection status in PCA9513D,112?

The READY pin of the PCA9513D,112 is an open-drain output that remains LOW during power-up initialization, ENABLE=LOW, or until bus idle (≥50 µs) or STOP condition is detected on SCLIN/SDAIN. It transitions HIGH only after successful connection establishment, providing unambiguous hardware confirmation that backplane and card sides are electrically linked and ready for I²C transactions.

Can PCA9513D,112 be used in series with other I²C buffers?

Yes, the PCA9513D,112 supports series cascading with other PCA951x devices (e.g., PCA9511, PCA9512) due to its dynamic offset driver design. However, maximum recommended cascade depth is two devices, as cumulative offset voltage (≤150 mV per stage) may exceed rising-edge accelerator thresholds beyond that point, risking false clock edges or timing violations in 400 kHz operation.

What is the significance of the 0.8 V rise-time accelerator threshold in PCA9513D,112?

The 0.8 V rise-time accelerator threshold in PCA9513D,112 improves noise margin over earlier 0.6 V devices (e.g., PCA9510/11) by requiring a higher voltage crossing before activating the 2 mA boost current. This reduces susceptibility to false triggering from signal bounce, EMI-induced transients, or slow-rising noise, ensuring reliable I²C timing in electrically noisy backplane environments.

Does PCA9513D,112 support clock stretching and multi-master arbitration?

Yes, the PCA9513D,112 fully supports clock stretching and multi-master arbitration as defined in I²C specification. Its bidirectional buffering preserves SCL/SDA line contention behavior, allowing masters to hold SCL LOW and slaves to stretch clocks without interference. The dynamic offset drivers maintain valid logic levels during arbitration pulses, ensuring protocol-compliant operation at up to 400 kHz.