Diodes Incorporated PI7C9X3G808GPBHFCEX

Overview

PI7C9X3G808GPBHFCEX from Diodes Incorporated is an 8-port, 8-lane PCI Express Gen 3 packet switch with integrated reference clock buffer, supporting up to 8 GT/s per lane, full non-blocking switching fabric, and hot-plug management. It operates at 1.8 V core voltage, supports PCIe 3.0 compliance (ECN 2.0), and enables scalable I/O expansion in server backplanes and embedded computing systems.

For engineers reviewing the PI7C9X3G808GPBHFCEX datasheet, PI7C9X3G808GPBHFCEX pinout, PI7C9X3G808GPBHFCEX application, or PI7C9X3G808GPBHFCEX equivalent, key selection criteria include lane configuration flexibility (x1/x2/x4/x8 port mapping), integrated SMBus/I²C configuration interface, LTSSM state control, and cross-domain endpoint mode for co-processor interconnect.

Technical Context

The PI7C9X3G808GPBHFCEX implements a deterministic, credit-based PCIe 3.0 transaction layer with full TLP decapsulation/encapsulation, routing logic supporting address-based and ID-based forwarding, and configurable port arbitration. It integrates a 100 MHz differential reference clock buffer with spread-spectrum support and programmable output swing.

Its physical layer includes per-lane equalization control, DLL-based lane alignment, and LTSSM CSR registers for precise link training state monitoring. The device supports both base fan-out mode and cross-domain endpoint mode, enabling transparent PCIe topology extension across isolated host domains with BAR translation (DAT/ALUT) and doorbell-scratchpad messaging.

Key Specifications

Pinout & Package

PI7C9X3G808GPBHFCEX is housed in a 25 mm × 25 mm, 484-pin FCBGA package with 0.8 mm pitch and thermal lid. Pin assignment follows PCIe 3.0 signal integrity guidelines, including dedicated differential pairs for REFCLK, PERST#, and sideband management signals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen 3 switch applications.

Compared with LAN9668 and PEX8747, the PI7C9X3G808GPBHFCEX delivers optimal balance of integration (integrated clock buffer), compact footprint, and cross-domain endpoint capability-making it uniquely suited for space-constrained, multi-host embedded systems requiring hardware-isolated PCIe interconnect.

Availability

PI7C9X3G808GPBHFCEX is available at Aetrix Electronics and suitable for server I/O expansion, industrial edge gateways, embedded AI accelerator racks, and multi-root I/O virtualization systems requiring stable component supply, long-term lifecycle assurance, and production-ready qualification.

Supply support for PI7C9X3G808GPBHFCEX 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 integrated circuits headquartered in California, specializing in high-performance analog, logic, and interconnect solutions for industrial, computing, and communications markets.

The PI7C9X3G808GPBHFCEX belongs to Diodes' PCI Express Switch product line, engineered specifically for scalable, low-latency PCIe Gen 3 expansion in resource-constrained embedded and edge computing platforms where integration, thermal efficiency, and cross-domain interoperability are critical.

FAQ

Does PI7C9X3G808GPBHFCEX support PCIe Gen 4?

No. The PI7C9X3G808GPBHFCEX is a PCIe Gen 3–compliant device rated for 8 GT/s maximum per lane. It does not support Gen 4's 16 GT/s data rate, nor does it meet Gen 4 electrical specifications such as improved equalization or tighter jitter tolerance. Systems requiring Gen 4 must use a dedicated Gen 4 switch.

Can PI7C9X3G808GPBHFCEX operate without an external EEPROM?

Yes. The device supports EEPROM-less boot via parallel configuration strapping pins (e.g., MODE[2:0], STRAP[7:0]) and runtime configuration via SMBus/I²C. Default port mapping and link settings are defined by hardware strapping; no external EEPROM is required for basic operation.

What thermal management provisions exist for PI7C9X3G808GPBHFCEX?

The device features a thermally enhanced FCBGA package with exposed thermal lid and integrated thermal sensor output (TSENSE pin). Diodes specifies junction-to-case thermal resistance (θ_JC) of 3.2°C/W. Recommended PCB layout includes ≥4 thermal vias under the lid and 2 oz copper pour on inner layers for conduction cooling in ≤2.8 W typical power scenarios.

Is cross-domain endpoint mode compatible with standard PCIe enumeration?

Yes. In cross-domain endpoint mode, the PI7C9X3G808GPBHFCEX presents itself as a standard PCIe endpoint to each host domain. BAR translation (DAT/ALUT) and ID remapping occur transparently in hardware-no OS or driver modifications are needed. Enumeration proceeds normally per PCIe Base Spec v3.0, Section 7.8.