Diodes Incorporated PI7C9X2G304EVAZXAEX

Overview

PI7C9X2G304EVAZXAEX from Diodes Incorporated is a PCI Express Gen 2 packet switch with 3 ports (1 upstream + 2 downstream), 4-lane configuration, 2.5 GT/s data rate, 1.2 V core supply, and 136-pin AQFN package. It routes TLPs between PCIe endpoints in embedded computing, industrial control, and network edge systems requiring deterministic low-latency interconnect.

For engineers reviewing the PI7C9X2G304EVAZXAEX datasheet, PI7C9X2G304EVAZXAEX pinout, PI7C9X2G304EVAZXAEX application, or PI7C9X2G304EVAZXAEX equivalent, key selection criteria include lane allocation flexibility, EEPROM-based configuration, L1 substate support, and compliance with PCIe Base Spec 2.0 and ECN for Port Disable/QUIET mode.

Technical Context

This switch implements full PCIe 2.0 transaction, data link, and physical layer functions across three configurable ports. It supports per-port VC arbitration, TC/VC mapping, flow control credits, and dynamic power management including L0s/L1 entry/exit with hardware-assisted LTSSM state transitions.

The device integrates transparent bridge functionality with programmable routing tables, queue depth control (PH/PD/NPHD/CPLH/CPLD), and debug features including DEBUGOUT control/data registers and JTAG boundary scan. Configuration is managed via EEPROM auto-load or SMBus/I²C interfaces at reset.

Key Specifications

Pinout & Package

PI7C9X2G304EVAZXAEX uses a 136-pin AQFN package with 0.4 mm pitch, 6 mm × 6 mm body, and exposed thermal pad. Pin assignment follows PCIe 2.0 signal integrity requirements with dedicated differential pairs, reference clock inputs, and dedicated SMBus/I²C and JTAG pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen 2 packet switch applications.

Compared with ASM1083 and PI7C9X2G308BQ, PI7C9X2G304EVAZXAEX uniquely balances 3-port fan-out, x4 upstream bandwidth, L1 power gating, and compact AQFN packaging - making it optimal for space-constrained industrial and medical edge systems requiring moderate PCIe interconnect scalability.

Availability

PI7C9X2G304EVAZXAEX is available at Aetrix Electronics and suitable for industrial machine vision, embedded network appliances, and medical imaging control systems requiring stable component supply and long-term lifecycle support.

Supply support for PI7C9X2G304EVAZXAEX 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, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The PI7C9X2G series targets embedded PCIe interconnect applications requiring low-power, small-footprint, and configuration-flexible packet switching - specifically designed for industrial, medical, and communications equipment where Gen 2 performance meets cost and size constraints.

FAQ

Does PI7C9X2G304EVAZXAEX support PCIe Gen 3?

No. The device is strictly PCIe Gen 2 compliant, operating at 2.5 GT/s with Gen 2 physical and data link layer logic. It does not implement Gen 3 equalization, 8b/10b encoding bypass, or 5.0 GT/s signaling - attempting Gen 3 link training will fail at the electrical detection phase.

Can the downstream ports operate at different lane widths?

Yes. Each downstream port can be independently configured as x1 or x2 via EEPROM strap bits or runtime register writes. The upstream port remains fixed at x4, and total lane count is conserved - e.g., one x2 and one x1 downstream configuration consumes all four upstream lanes.

Is external EEPROM mandatory for operation?

No. EEPROM is optional for initial configuration. The device supports default "hard-wired" topology via pin strapping (e.g., PORTSEL pins) and allows full runtime configuration via SMBus or I²C. EEPROM simplifies system startup but is not required for functional operation.

What thermal management is required for continuous operation?

The AQFN package requires a minimum 200 mm² copper thermal pad connected to a solid ground plane. At 85°C ambient and full x4/x2/x2 load, junction temperature remains below 115°C with 200 LFM airflow - no heatsink is needed, but board-level thermal vias under the exposed pad are mandatory for reliability.