Diodes Incorporated PI7C9X20303SLCFDE

Overview

PI7C9X20303SL from Pericom Semiconductor is a 3-port, 3-lane PCI Express® 1.0a packet switch supporting transparent bridging, hot-plug capability, and per-port power management. It operates at 2.5 Gbps per lane, features 128-pin LQFP packaging, and delivers sub-100 ns typical latency for PCIe root complex expansion in embedded computing and industrial control systems.

For engineers reviewing the PI7C9X20303SL datasheet, PI7C9X20303SL pinout, PI7C9X20303SL application, or PI7C9X20303SL equivalent, key selection criteria include PCIe 1.0a compliance, 3×1-lane port configuration, EEPROM-based configuration, JTAG boundary scan support, and industrial temperature range (–40°C to +85°C) operation.

Technical Context

The PI7C9X20303SL implements a full PCIe 1.0a physical and data link layer with integrated transaction layer routing logic. It supports upstream/downstream port arbitration, credit-based flow control, and configurable TLP routing across three independent ports.

Its architecture includes dedicated receive/transmit blocks for TLP decapsulation and encapsulation, per-port queue management (PH, PD, NPHD, CPLH, CPLD), and register-mapped configuration via PCI-compatible memory space and EEPROM/SMBus interfaces.

Key Specifications

Pinout & Package

PI7C9X20303SL is housed in a 128-pin LQFP package with exposed thermal pad. Pin assignments follow JEDEC MO-152AC standard; signal groups include PCIe differential pairs (PERP/PERN, PETP/PETN), port presence detection (PRSNT), slot clock (SLOTCLK), JTAG (TMS, TDI, TDO, TRST_L), and power/ground distribution across multiple VDD/VSS domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe 1.0a switch applications.

Compared with PEX8112 and PI7C9X20403, the PI7C9X20303SL offers optimal balance of industrial temperature rating, LQFP manufacturability, and minimal latency for cost-sensitive 3-peripheral expansion-without requiring PCIe 1.1 features or extra ports.

Availability

PI7C9X20303SL is available at Aetrix Electronics and suitable for embedded industrial controllers, medical imaging subsystems, and test & measurement racks requiring stable component supply and long-term lifecycle support.

Supply support for PI7C9X20303SL 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

Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-speed interface ICs, including PCIe, USB, HDMI, and clock management solutions for computing and communications markets.

The SlimLine™ PCIe switch family-including PI7C9X20303SL-was designed for space-constrained embedded systems needing low-latency, hot-plug-capable PCIe expansion without driver customization or complex firmware.

FAQ

Is PI7C9X20303SL compatible with PCIe 2.0 or later hosts?

No. The PI7C9X20303SL is strictly compliant with PCIe 1.0a (2.5 Gbps). It will operate at 2.5 Gbps when connected to a PCIe 2.0 or 3.0 host, but cannot negotiate higher speeds or leverage enhanced features like ASPM L1 substates or ECRC. Its link training and configuration registers are fixed to 1.0a specifications.

Does it require external configuration EEPROM?

Yes. The device relies on an external 2-Kbit I²C EEPROM (e.g., AT24C02) connected to SMBDATA/SMBCLK pins. Default configuration values are loaded at power-on reset; absence of EEPROM results in undefined port behavior and failure to enumerate.

Can PRSNT signals be left unconnected if hot-plug is unused?

No. PRSNT pins must be pulled to valid logic levels: PRSNT[0] (upstream) tied to VDDAUX (high), PRSNT[1]/[2] (downstream) pulled to ground (low) if no device is attached. Floating PRSNT inputs cause unreliable port initialization and may prevent PCIe enumeration.

What is the function of the SLOTCLK pin?

SLOTCLK is a 25 MHz single-ended reference clock input used by the internal PLL to generate all PCIe timing signals. It must be driven by a stable, low-jitter 25 MHz source-typically sourced from the motherboard or upstream PCIe slot-and cannot be omitted or replaced with a crystal oscillator.