PI7C9X2G404EVAQ2ZXAEX

Overview

The PI7C9X2G404EVAQ2ZXAEX is an automotive-grade PCIe 2.1 packet switch from the Diodes Incorporated PI7C9X2G304/404EVQ family. It features four x1 downstream ports and one x1 or x2 upstream port, supporting four lanes total. The device operates within a temperature range of -40°C to +105°C and is qualified to AEC-Q100 Grade 2 standards. It utilizes a 136-pin aQFN package measuring 10mm x 10mm. Typical latency for packet switching without blocking is less than 150ns. The component supports up to 512-byte maximum payload sizes and includes integrated 100MHz clock buffers for each downstream port.

Feature Summary

• Supports PCI-PM L1.1 sub-states and advanced link power management including L0, L0s, L1, L2, and L3 states.
• Provides reliability through data poisoning support, end-to-end CRC, and advanced error reporting with logging capabilities.
• Enables flexible system expansion by fanning out from various bridges such as MCUs, FPGAs, and video processing ICs.
• Includes programmable driver current and de-emphasis levels at individual ports to optimize signal integrity.

Applications

• Automotive telematics and infotainment platforms
• In-vehicle wireless access points and routers
• Vehicle-to-everything (V2V) systems
• Advanced Driver Assistance Systems (ADAS)
• Vehicle navigation and safety/security modules

Procurement Notes

Verify that the ordering suffix matches the required configuration, specifically noting that 'Q' indicates automotive compliance and '2' denotes AEC-Q100 Grade Level. Confirm the package type is the 136-pin aQFN and ensure the tape/reel packaging aligns with assembly requirements. Cross-reference the specific part number against the manufacturer's latest datasheet to confirm availability and any potential product change notices affecting this grade.

Selection Notes

Select this component when designing automotive systems requiring PCIe 2.1 connectivity with extended temperature ranges up to 105°C. It is suitable for applications needing four downstream ports to connect multiple endpoints to a central processor. Consider the low power dissipation characteristics if thermal management is critical. Ensure the design supports the necessary I2C or SMBus interfaces for configuration and monitoring functions.

Part Context

This part belongs to the PI7C9X2G304/404EVQ family, which offers automotive-compliant PCIe switches. The 404 variant provides four downstream ports compared to the 304 variant's three ports. Both share similar electrical characteristics and packaging but differ in port count. This family is designed to meet strict automotive reliability standards while providing cost-effective solutions for expanding PCIe connectivity in vehicle architectures.

Replacement Considerations

The PI7C9X2G304EVAQ2ZXAEX serves as a functional alternative with three downstream ports instead of four. Verify pin compatibility and software configuration differences before substitution. Other family members may require re-evaluation of lane allocation and power management settings to ensure system stability.

FAQ

What is the typical latency for packet switching in this device?

The typical latency for a packet running through the switch without blocking is less than 150ns.

Does this component support store-and-forward switching modes?

Yes, it supports both cut-through mode by default and store-and-forward mode for switching packets.

What power management states are supported?

It supports D0, D3 Hot, and D3Cold device states, along with link power states including L0, L0s, L1, L2, L2/L3 Ready, and L3.