Diodes Incorporated PI7C9X113SLFDEX

Overview

PI7C9X113SL from Diodes Incorporated is a PCI Express-to-PCI bridge IC enabling legacy PCI peripherals to interface with PCIe 1.0a root complexes. It supports x1 PCIe upstream link, 33 MHz/32-bit PCI bus, transparent bridging mode, and full PCI configuration space mapping. Key parameters include 1.15 V core voltage (VDDC), industrial temperature range (−40°C to +85°C), and integrated JTAG boundary scan.

For engineers reviewing the PI7C9X113SL datasheet, PI7C9X113SL pinout, PI7C9X113SL application, or PI7C9X113SL equivalent, this page delivers verified electrical specs, validated pin functions, real-world bridging use cases, and technically differentiated alternatives for legacy system upgrades and industrial control retrofits.

Technical Context

The PI7C9X113SL implements a dual-domain transaction translator with dedicated PCIe TLP parsing logic and PCI command decoding. It handles memory-mapped I/O forwarding, interrupt remapping (INTA#–INTD#), and configurable prefetchable/non-prefetchable memory windows via registers at offsets 20h–2Ch and 50h–64h.

Its bridging architecture supports both transparent mode (full address pass-through) and forward bridge mode (subordinate bus isolation). Power sequencing requires VDDA (analog) powered before VDDC (core), with defined power-off sequence per Section 14.2 of DS40300 Rev 7-2.

Key Specifications

Pinout & Package

PI7C9X113SL is housed in a 128-pin LQFP package (14 mm × 14 mm, 0.4 mm pitch) with exposed thermal pad. Pin assignments are fully documented in Section 2.8 of DS40300 Rev 7-2, including dedicated PCIe differential pairs, PCI multiplexed address/data lines, and mode-strapping inputs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI Express-to-PCI bridge applications.

Compared with PEX8112 and PI7C9X20300, the PI7C9X113SL offers optimized cost, industrial temperature support, and JTAG testability-making it preferred for fixed-function embedded retrofits where PCIe 1.0a bandwidth and minimal BOM count are priorities.

Availability

PI7C9X113SL is available at Aetrix Electronics and suitable for industrial PLC backplane expansion, medical imaging device retrofit, and avionics data acquisition modules requiring stable component supply and long-term lifecycle support.

Supply support for PI7C9X113SL 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design centers across Asia, Europe, and the U.S., serving industrial, computing, and communications markets.

The PI7C9X113SL belongs to Diodes' PCI Express bridge product line, engineered specifically for seamless integration of legacy PCI peripherals into PCIe-based systems in harsh-environment applications.

FAQ

Does PI7C9X113SL support PCIe 2.0 or higher?

No. The PI7C9X113SL is compliant only with PCIe 1.0a (2.5 GT/s) as specified in Section 1.3 of DS40300 Rev 7-2. It does not negotiate or operate at PCIe 2.0 (5.0 GT/s) or later speeds, and attempting to connect to a PCIe 2.0+ root port will result in fallback to 1.0a mode or initialization failure.

What is the required power sequencing order?

VDDA (analog supply) must be powered before VDDC (core supply), with both reaching regulation within 100 ms of each other. Section 14.1 of DS40300 Rev 7-2 specifies that violating this sequence may cause PCIe link training failure or corrupted configuration register reads during startup.

Can PI7C9X113SL operate in non-transparent bridging mode?

No. The device supports only transparent bridging and forward bridging modes, selected via MODE_SEL[1:0] strapping. Non-transparent bridging (NTB), which requires address translation and doorbell messaging, is not implemented and is absent from all configuration registers and functional descriptions in the datasheet.

Is an external EEPROM mandatory for operation?

No. External EEPROM is optional and used only for autoloading configuration registers at power-up. The device operates with default strap-configured settings if EEPROM is omitted or fails; all critical bridge functionality remains active using hardwired mode selection and reset defaults.