Diodes Incorporated PI7C9X2G304ELZXAE

Overview

PI7C9X2G304ELZXAE from Diodes Incorporated is a PCI Express Gen 2 packet switch IC with 3 ports (1 upstream + 2 downstream) and 4 total PCIe lanes, supporting transparent bridging, configurable port arbitration, and full PCIe 2.0 compliance (5.0 GT/s). It operates at 1.05 V core voltage, features integrated EEPROM interface for configuration, and targets embedded systems requiring PCIe lane expansion or topology flexibility.

For engineers reviewing the PI7C9X2G304ELZXAE datasheet, PI7C9X2G304ELZXAE pinout, PI7C9X2G304ELZXAE application, or PI7C9X2G304ELZXAE equivalent, key selection criteria include its 3-port/4-lane topology, support for hot-plug-capable downstream ports, programmable VC mapping, low-latency routing logic, and compatibility with standard PCIe root complex and endpoint configurations.

Technical Context

This switch implements a full PCIe 2.0 Transaction Layer (TLP encapsulation/decapsulation), Data Link Layer (ACK/NAK, flow control), and Physical Layer (receiver equalization, transmitter de-emphasis, electrical idle latency management). It supports both transparent and non-transparent bridge modes via register configuration.

The device uses a hierarchical routing architecture with per-port TC/VC mapping, credit-based flow control across all virtual channels, and configurable arbitration schemes (round-robin or weighted fair queuing) for upstream/downstream traffic prioritization.

Key Specifications

Pinout & Package

The PI7C9X2G304ELZXAE is housed in a 136-pin Advanced Quad Flat No-lead (AQFN) package with exposed thermal pad, designed for high-density PCB layouts and thermal reliability in space-constrained embedded systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ASM1083 and PI7C9X2G604, the PI7C9X2G304ELZXAE delivers optimal balance of port count, configurability, and footprint-ideal for compact edge systems needing exactly two downstream endpoints with robust hot-plug and VC-aware traffic management.

Availability

PI7C9X2G304ELZXAE is available at Aetrix Electronics and suitable for industrial edge gateways, medical imaging controllers, automotive ADAS domain controllers, and test & measurement rack systems requiring stable component supply and long-term lifecycle assurance.

Supply support for PI7C9X2G304ELZXAE 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, specializing in high-performance analog, logic, and interconnect solutions for industrial, computing, and communications markets.

The PI7C9X2G304ELZXAE belongs to Diodes' PCIe Switch product line, engineered specifically for embedded systems requiring reliable, low-latency PCIe lane expansion without sacrificing configurability or thermal efficiency.

FAQ

Does the PI7C9X2G304ELZXAE support PCIe Gen 3?

No. The PI7C9X2G304ELZXAE is strictly PCIe Gen 2 compliant, operating at 5.0 GT/s with full Gen 2 protocol stack implementation. It does not support Gen 3's 8.0 GT/s signaling rate, nor does it include Gen 3-specific features such as modified equalization or enhanced scrambling. Systems requiring Gen 3 must use a different switch IC.

Can the port configuration be changed after power-up?

Yes. Port configuration-including lane assignment, upstream/downstream role, and hot-plug enablement-can be dynamically updated via the SMBus interface or through writes to specific configuration registers (e.g., SWITCH OPERATION MODE at offset 74h). Changes take effect after link retraining, allowing runtime topology adaptation.

What is the function of the TPD pin?

The TPD (Thermal Pad) is an exposed copper pad on the underside of the 136-pin AQFN package. It must be soldered to a thermally conductive PCB ground plane to dissipate heat from the die and reduce junction temperature. Failure to connect TPD may cause thermal shutdown or parametric drift under sustained load.

Is external EEPROM required for operation?

No. The PI7C9X2G304ELZXAE integrates a 2 Kbit serial EEPROM that stores default configuration settings, eliminating the need for external memory. External EEPROM is optional and only used if larger configuration space or field-upgrade flexibility beyond the internal capacity is required.