Diodes Incorporated PI7C9X440SLBFDEX

Overview

PI7C9X440SLBFDEX from Diodes Incorporated is a PCI Express 1.1-to-USB 2.0 host controller IC that bridges x1 PCIe upstream link to four USB 2.0 downstream ports, supporting OHCI and EHCI host controller functionality with integrated PHYs, 128-pin LQFP package, and industrial temperature range (–40°C to +85°C).

For engineers reviewing the PI7C9X440SLBFDEX datasheet, PI7C9X440SLBFDEX pinout, PI7C9X440SLBFDEX application, or PI7C9X440SLBFDEX equivalent, key selection criteria include PCIe 1.1 compliance, USB 2.0 high-speed (480 Mbps) port count, embedded EEPROM configuration, JTAG boundary scan support, and power management features including ASPM L0s/L1.

Technical Context

The device implements a full PCIe root complex endpoint with Transaction, Data Link, and Physical layers compliant to PCIe Base Specification Rev 1.1, supporting 2.5 GT/s signaling, 128-byte maximum payload size, and MSI interrupt delivery. It integrates dual-mode USB host controller logic-OHCI for legacy compatibility and EHCI for high-speed operation-with on-die USB transceivers meeting USB 2.0 electrical specifications.

Configuration is managed via internal 2-Kbit EEPROM auto-loaded at reset, with optional SMBus or JTAG access for runtime updates. The device supports hot-plug detection, port wake capability, and PCIe power states (L0, L0s, L1), enabling system-level power optimization in embedded host applications.

Key Specifications

Pinout & Package

The PI7C9X440SLBFDEX is housed in a 128-pin LQFP package (14 mm × 14 mm, 0.4 mm pitch) with exposed thermal pad (EPAD) connected to VSS for enhanced thermal dissipation in sustained USB/PCIe data transfer scenarios.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe-to-USB host controller applications.

Compared with ASM1083 and VL805-Q4, the PI7C9X440SLBFDEX uniquely delivers self-contained PCIe 1.1-to-USB 2.0 bridging with OHCI/ECI dual-stack support, integrated EEPROM, and industrial temperature operation - making it optimal for cost-sensitive, space-constrained embedded systems needing proven USB 2.0 interoperability without driver rework.

Availability

PI7C9X440SLBFDEX is available at Aetrix Electronics and suitable for industrial control HMIs, medical diagnostic equipment, embedded network appliances, and ruggedized data acquisition systems requiring stable component supply across multi-year production cycles.

Supply support for PI7C9X440SLBFDEX 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, high-reliability solutions for industrial, computing, and communications markets.

The PI7C9X440SL belongs to Diodes' interface and connectivity product line, designed specifically to simplify PCIe-based system expansion with native USB host capability - targeting embedded designers needing drop-in USB connectivity without FPGA or custom ASIC development.

FAQ

Does PI7C9X440SLBFDEX support PCIe 2.0 or higher?

No. The PI7C9X440SLBFDEX is strictly compliant with PCI Express Base Specification Revision 1.1 and operates at 2.5 GT/s only. It does not negotiate or function at PCIe 2.0 (5.0 GT/s) speeds. Attempting connection to a PCIe 2.0+ root port will result in fallback to 1.1 mode or link training failure depending on the upstream controller's backward compatibility implementation.

Can the USB ports operate independently at different speeds?

Yes. Each of the four USB ports supports autonomous speed negotiation - individual ports may operate simultaneously at high-speed (480 Mbps), full-speed (12 Mbps), or low-speed (1.5 Mbps) based on attached device capability. The EHCI engine handles high-speed traffic while OHCI manages full/low-speed devices, with automatic transaction scheduling managed in hardware.

Is external EEPROM required for configuration?

No. The PI7C9X440SLBFDEX contains an integrated 2-Kbit serial EEPROM that stores all critical configuration data (PCIe IDs, USB port enable/disable, power management settings). External EEPROM is optional and used only for advanced field updates via SMBus or JTAG - default boot behavior relies entirely on the internal memory.

What thermal management is needed for continuous USB 2.0 operation?

The 128-pin LQFP package includes an exposed EPAD thermally connected to VSS. For sustained 480 Mbps operation across all four ports, a minimum 4-layer PCB with ≥2 oz copper on inner layers and ≥4 thermal vias under the EPAD is required. Junction temperature must remain ≤115°C; typical power dissipation is 1.2 W at full load with proper layout and airflow >0.5 m/s.