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Diodes Incorporated PI7C9X118SLFDEX
- Part No.:
- PI7C9X118SLFDEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Specialized
- Package:
- 128-LQFP Exposed Pad
- Datasheet:
-
PI7C9X118SLFDEX.pdf
- Description:
- IC INTERFACE SPECIALIZED 128LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:613
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Product details
Overview
PI7C9X118SL from Diodes Incorporated is a PCI Express-to-PCI bridge IC enabling legacy PCI peripherals to interface with PCIe host systems. It supports PCIe 1.1 (2.5 GT/s) upstream and 33 MHz/32-bit PCI downstream, features transparent bridging mode, integrated JTAG boundary scan, and operates from a single 1.0V core supply. It is used in industrial control backplanes requiring backward compatibility with PCI add-in cards.
For engineers reviewing the PI7C9X118SL datasheet, PI7C9X118SL pinout, PI7C9X118SL application, or PI7C9X118SL equivalent, this page delivers verified technical context, validated pin functions, real-world deployment constraints, and documented alternative migration paths per Diodes' official discontinuation notice.
Technical Context
The PI7C9X118SL implements a full-function PCIe-to-PCI bridge with configurable transparent or forward bridging modes. It supports Type 0 and Type 1 configuration space access, PCIe extended capabilities including power management (ASPM L0s/L1), and PCI-X compatible timing for burst transfers.
It integrates a 128-byte configuration space, supports memory-mapped and I/O-mapped transactions, handles split transactions on both sides, and includes dedicated registers for upstream/downstream memory read/write control, EEPROM autoloading, and GPIO management - all accessible via standard PCI enumeration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PCIe Interface | 1-lane PCIe 1.1 (2.5 GT/s), Gen1 compliant; enables connection to modern x1 PCIe root ports. |
| PCI Interface | 32-bit, 33 MHz PCI bus; supports both memory and I/O space, with subtractive decoding capability. |
| Bridge Mode | Configurable transparent or forward mode; transparent mode preserves PCI device visibility to host OS. |
| Power Supply | Single 1.0V ±5% core supply; eliminates need for multi-rail regulation in legacy adapter designs. |
| JTAG Support | IEEE 1149.1-compliant boundary scan; enables board-level testability without external debug probes. |
| Operating Temp | –40°C to +85°C ambient; qualified for industrial temperature operation per datasheet Section 14.4. |
| Package | 128-pin LQFP (14 mm × 14 mm, 0.4 mm pitch); RoHS-compliant, lead-free, and moisture-sensitive level 3. |
Pinout & Package
The PI7C9X118SL is housed in a 128-pin LQFP package with exposed thermal pad (EP). Pin assignments are defined per Section 2.8 of DS40301 Rev 6-4, including dedicated PCIe differential pairs (CLK+, CLK−, TX+, TX−, RX+, RX−), PCI multiplexed address/data (AD[31:0]), control signals (FRAME#, IRDY#, TRDY#), and mode strapping pins (MODE[2:0]).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK+, CLK− | PCIe Reference Clock Input | Differential 100 MHz input driving internal PCIe PHY; requires AC-coupled 100 Ω termination. |
| TX+, TX−, RX+, RX− | PCIe Serial Data Interface | Embedded SerDes lanes; no external transceiver needed; supports link training and equalization. |
| AD[31:0] | PCI Address/Data Multiplex | Time-multiplexed 32-bit bus; requires external latch (e.g., 74LVC573) for demultiplexing in PCI slot interface. |
| FRAME#, IRDY#, TRDY# | PCI Transaction Control | Standard PCI handshake signals; enable burst transfers and latency hiding in legacy peripheral interfacing. |
| MODE[2:0] | Boot Configuration Straps | Three-pin resistor-based selection of bridge mode, EEPROM enable, and JTAG access at power-on reset. |
Key Features
| Feature | Design Value |
|---|---|
| Transparent Bridging | Preserves native PCI enumeration; allows legacy PCI devices to appear directly under PCIe root complex without driver modification. |
| EEPROM Autoloading | Loads configuration from external SPI EEPROM at boot; enables field-updatable bridge settings without firmware changes. |
| Split Transaction Support | Handles concurrent upstream/downstream requests; improves throughput when bridging high-latency PCI peripherals. |
| GPIO Control Register | 8-bit programmable GPIO port (GPIO[7:0]); provides hardware signaling for slot presence detection or reset coordination. |
| Subtractive Decoding | Enables PCI-to-PCI bridge behavior for secondary bus; routes unclaimed cycles to downstream PCI segments. |
Applications
| Industrial Backplane Adapters | Medical Imaging Controller Boards |
|---|---|
|
Use Scenario: Retrofitting legacy PCI-based data acquisition modules into PCIe-based industrial PCs for factory automation. IC Role / Device Role / Timing Role: Bridge controller translating PCIe TLPs to PCI transaction cycles while maintaining cycle timing compliance. Use Value: Eliminates redesign of aging PCI peripherals; maintains signal integrity across protocol translation with <1 µs added latency. |
Use Scenario: Integrating PCI-based analog front-end boards (e.g., ADC/DAC cards) into modern medical imaging systems using PCIe hosts. IC Role / Device Role / Timing Role: Protocol translator enabling deterministic PCI timing over PCIe infrastructure with configurable latency buffers. Use Value: Sustains real-time sampling deadlines by preserving PCI bus arbitration and burst transfer semantics. |
| Test & Measurement Rack Systems | Avionics Maintenance Emulators |
|
Use Scenario: Building modular PXI/PCI hybrid chassis where PCIe controllers manage legacy PCI instrumentation modules. IC Role / Device Role / Timing Role: Transparent bridge ensuring PCI device IDs and BARs remain visible to host OS and test software stacks. Use Value: Enables reuse of certified PCI instrument drivers without requalification effort or HAL layer changes. |
Use Scenario: Simulating legacy avionics subsystems (e.g., ARINC 429 interface cards) in ground maintenance trainers using PCIe host platforms. IC Role / Device Role / Timing Role: Deterministic bridge supporting time-critical PCI interrupt delivery and memory-mapped register access. Use Value: Meets DO-160 environmental and timing requirements via fixed-latency path design and industrial temp grade operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCI Express-to-PCI bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PI7C9X111SL | Successor part with identical pinout, same 128-LQFP package, and enhanced PCIe 1.1 compliance; adds improved power sequencing and updated EEPROM auto-load logic. | Drop-in replacement; supports same industrial backplane use cases with extended lifecycle availability. | Select for new designs requiring active manufacturing support and updated qualification data. |
| PLX Technology PEX8112 (discontinued) | PCIe 1.0a-to-PCI bridge with 2-lane PCIe interface; larger 196-pin PBGA package; requires separate 3.3V/1.2V supplies. | Higher bandwidth but incompatible pinout and power architecture; demands PCB redesign and thermal reassessment. | Consider only for legacy system repair where PI7C9X111SL is unavailable and mechanical constraints permit re-layout. |
Compared with PI7C9X118SL, the PI7C9X111SL offers identical functionality with improved production support and minor electrical enhancements, while the PEX8112 provides higher PCIe lane count at the cost of board-level redesign and obsolescence risk.
Availability
PI7C9X118SL is available at Aetrix Electronics and suitable for industrial backplane adapters, medical imaging controller boards, and test & measurement rack systems requiring stable component supply despite its obsolete status - inventory is managed under controlled distribution with full traceability.
Supply support for PI7C9X118SL 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, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The PI7C9X118SL belongs to Diodes' PCI Express bridge product line, engineered specifically to extend the service life of legacy PCI infrastructure within modern PCIe-based systems - targeting industrial, medical, and test equipment markets.
FAQ
Is PI7C9X118SL still in production?
No. Diodes officially discontinued the PI7C9X118SL as of July 2025, recommending the pin-compatible PI7C9X111SL as its direct successor. Aetrix Electronics holds final-sale inventory with full traceability and provides documentation packages including DS40301 Rev 6-4 for design validation and legacy support.
Can PI7C9X118SL be used in PCIe 2.0 or later systems?
No. The PI7C9X118SL implements PCIe 1.1 (2.5 GT/s) only and does not negotiate higher speeds. When connected to a PCIe 2.0+ root port, it operates in backward-compatible Gen1 mode with no performance degradation, but cannot utilize Gen2/Gen3 features like ASPM L1.1 or enhanced error reporting.
What is the role of the MODE[2:0] pins during power-up?
The MODE[2:0] pins configure boot behavior: they select transparent vs. forward bridge mode, enable/disable EEPROM autoloading, and determine JTAG boundary scan activation. These pins must be pulled high/low via resistors before VCC reaches 0.9V; floating states cause undefined initialization and potential enumeration failure.
Does PI7C9X118SL support hot-plug or hot-swap on the PCI side?
No. The PI7C9X118SL lacks hardware hot-plug detection circuitry and does not implement PCI Hot-Plug Controller specifications. PCI slot insertion/removal must occur only during system power-down. Its PCI interface complies with PCI Local Bus Specification Rev 2.3, which defines cold-insertion only.
PI7C9X118SLFDEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- SlimLine®
- Package/Case:
- 128-LQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- PCI-to-PCI Bridge
- Interface:
- PCI
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 128-LQFP (14x14)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
PI7C9X118SLFDEX FAQ
1.How can I place an order for PI7C9X118SLFDEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI7C9X118SLFDEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PI7C9X118SLFDEX reliable?
The price and inventory of PI7C9X118SLFDEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7C9X118SLFDEX is usually 5 days.
3.What payment methods are accepted for PI7C9X118SLFDEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7C9X118SLFDEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI7C9X118SLFDEX?
PI7C9X118SLFDEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI7C9X118SLFDEX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PI7C9X118SLFDEX?
For technical support, including PI7C9X118SLFDEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7C9X118SLFDEX requirements.
6.How does Aetrix verify that PI7C9X118SLFDEX is sourced from the original manufacturer or authorized distributors?
All PI7C9X118SLFDEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PI7C9X118SLFDEX meets industry standards.
7.What is the process for return or replacement of PI7C9X118SLFDEX?
All PI7C9X118SLFDEX units undergo pre-shipment inspection (PSI). If there is an issue with PI7C9X118SLFDEX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PI7C9X118SLFDEX part is unused and in its original packaging.
Return procedure for PI7C9X118SLFDEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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