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Diodes Incorporated PI7C9X7952BFDE
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- Part No.:
- PI7C9X7952BFDE
- Manufacturer:
- Diodes Incorporated
- Category:
- Controllers
- Package:
- 128-LQFP
- Datasheet:
-
PI7C9X7952BFDE.pdf
- Description:
- IC PCIE-TO-UART BRIDGE 128LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,253
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Product details
Overview
PI7C9X7952BFDE from Diodes Incorporated is a PCI Express® 1.1-compliant dual UART bridge IC with integrated PCIe endpoint logic, two independent 16C950-compatible UART channels, 128-byte transmit/receive FIFOs, and programmable baud rates up to 15 Mbps. It operates from a single 3.3 V supply, supports MSI and legacy INTA interrupts, and targets embedded host expansion where legacy serial peripherals must interface via modern PCIe slots.
For engineers reviewing the PI7C9X7952BFDE datasheet, PI7C9X7952BFDE pinout, PI7C9X7952BFDE application, or PI7C9X7952BFDE equivalent, key selection criteria include PCIe endpoint compliance level (1.1), UART FIFO depth (128 B per channel), interrupt architecture (MSI vs. INTA), EEPROM configuration support, and industrial temperature range (–40°C to +85°C).
Technical Context
This device implements a PCIe-to-parallel-bus bridge that maps UART register space into PCIe memory-mapped I/O (MMIO) and I/O port space. Its dual UART cores support full RS-232/RS-485 framing, hardware flow control (RTS/CTS), and enhanced modes including 450/550/950 compatibility with legacy 16550/16C950 drivers.
The IC integrates a 25 MHz crystal oscillator input path, configurable clock prescaler (÷1 to ÷16), and power management features including D0–D3hot states, L1 substates, and wake-on-RX capability. All PCIe link-layer functions-including ACK/NAK, replay, and error reporting-are implemented in hardware per PCIe 1.1 specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PCIe Interface | Gen1 x1 lane, compliant with PCIe 1.1 spec; enables direct plug-in to standard PCIe root complex without external switch or controller. |
| UART Channels | Dual independent 16C950-compatible UARTs; each supports 5–9 data bits, 1–2 stop bits, parity, and break detection. |
| FIFO Depth | 128-byte TX/RX FIFO per channel; reduces CPU interrupt load and prevents overrun at high baud rates (≤15 Mbps). |
| Baud Rate Range | 50 bps to 15 Mbps; achieved via 32-bit divisor with programmable clock prescaler (1–16×), enabling precise timing for industrial protocols. |
| Operating Temp | –40°C to +85°C; qualified for industrial-grade deployment in factory automation, POS terminals, and network edge devices. |
| Supply Voltage | 3.3 V ±10%; single-rail operation eliminates need for auxiliary voltage regulators or level shifters in host systems. |
| Interrupt Support | Message Signaled Interrupts (MSI) and legacy INTA; MSI enables scalable, low-latency interrupt delivery in multi-device PCIe topologies. |
Pinout & Package
Package: 160-pin LFBGA (9 mm × 9 mm, 0.65 mm pitch), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKINP / CLKINN | Differential crystal oscillator input | Accepts 25 MHz fundamental-mode crystal; internal oscillator eliminates need for external clock generator. |
| PERST_L | PCIe reset input | Active-low asynchronous reset synchronized to PCIe link training; required for PCIe enumeration compliance. |
| WAKEUP_L | Wake-from-sleep signal output | Open-drain output asserted when RX activity occurs during D3hot; enables host system resume without polling. |
| GPIO[7:0] | General-purpose I/O | Configurable as inputs/outputs; used for board-level status signaling, UART mode selection, or peripheral enable control. |
| SR_DO / SR_DI | Serial EEPROM interface | Supports 2-wire SPI-like EEPROM (e.g., AT25010B) for storing vendor ID, subsystem ID, and UART configuration defaults. |
Key Features
| Feature | Design Value |
|---|---|
| PCIe Endpoint Compliance | Fully self-contained PCIe endpoint with integrated TLP parser, credit manager, and configuration space; no external firmware or host driver modification needed. |
| Dual UART Independence | Each UART has dedicated 128-byte FIFO, separate interrupt vectors, and independent baud rate/divisor registers-enabling simultaneous RS-232 and RS-485 operation on one chip. |
| Enhanced Mode Support | Hardware emulation of 16450/16550/16C950 register sets plus proprietary 450/550/950 modes; ensures drop-in compatibility with legacy OS drivers (Linux serial_core, Windows Serenum). |
| EEPROM Configuration | On-power-up, loads vendor/device IDs, subsystem IDs, and GPIO defaults from external SPI EEPROM-enabling field-programmable board identity without re-spinning firmware. |
| Industrial Power Management | Supports PCIe D0–D3hot states and L1 substates; WAKEUP_L output allows host to enter deep sleep while retaining serial wake capability. |
Applications
| Industrial HMI Terminals | Network Equipment Serial Console |
|---|---|
Use Scenario: DIN-rail mounted PLCs and HMIs require reliable RS-232/485 communication with SCADA systems over long cable runs. IC Role / Device Role / Timing Role: PCIe-to-serial bridge enabling legacy serial protocol stacks (Modbus RTU, DF1) to run on modern x86-based controllers via PCIe add-in cards. Use Value: 128-byte FIFOs prevent data loss at 115.2 kbps over 1 km RS-485 lines; industrial temp rating ensures uptime in unconditioned cabinets. |
Use Scenario: Enterprise switches/routers use dedicated serial console ports for out-of-band management during boot or failure recovery. IC Role / Device Role / Timing Role: Provides isolated, high-reliability UART interface mapped to PCIe MMIO space-allowing BIOS/firmware-level access without USB dependency. Use Value: MSI interrupt support enables low-latency console response (<5 µs) under heavy network traffic; EEPROM-stored default settings accelerate field replacement. |
| Medical Diagnostic Interfaces | Retail Point-of-Sale Systems |
Use Scenario: Ultrasound and imaging devices integrate serial interfaces for calibration tools, barcode scanners, and legacy lab equipment. IC Role / Device Role / Timing Role: Bridges PCIe-based mainboard to multiple RS-232 peripherals using shared PCIe slot bandwidth-reducing BOM count versus discrete UART+bridge solutions. Use Value: Dual UARTs eliminate need for two separate chips; 15 Mbps max baud supports high-speed firmware updates to connected instruments. |
Use Scenario: POS terminals connect receipt printers, magnetic stripe readers, and cash drawers via RS-232/485 while sharing compact motherboard real estate. IC Role / Device Role / Timing Role: Enables PCIe-based SFF motherboards to retain legacy serial peripherals without compromising form factor or thermal design. Use Value: Single 3.3 V supply simplifies power delivery; GPIO[7:0] pins configure printer handshaking (DTR/DSR) and drawer-kick signals directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCIe-to-serial bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EXAR XR17V352IL-F | PCIe 2.0 x1, 256-byte FIFOs per UART, integrated 1.8 V LDO for core logic; requires dual-supply (3.3 V I/O + 1.8 V core). | Higher bandwidth and deeper FIFOs suit high-throughput medical data loggers; LDO adds layout complexity but improves noise immunity. | Select when PCIe Gen2 compatibility or >15 Mbps baud is required; verify thermal derating for 1.8 V regulator in constrained enclosures. |
| ASIX AX99100-ALF | PCIe 2.0 x1, quad UART, integrated USB 2.0 host controller; no EEPROM interface; supports only legacy INTA interrupts. | Targets cost-sensitive multi-peripheral systems (e.g., kiosks) needing USB + serial; lacks MSI and EEPROM configurability. | Choose for USB-serial hybrid designs where PCIe enumeration simplicity outweighs advanced power management and field-programmable ID needs. |
Compared with XR17V352IL-F and AX99100-ALF, the PI7C9X7952BFDE offers optimal balance of PCIe 1.1 compliance, industrial temperature support, EEPROM-based board identity, and MSI interrupt scalability-making it ideal for field-deployed embedded systems requiring long-term supply stability and driver compatibility.
Availability
PI7C9X7952BFDE is available at Aetrix Electronics and suitable for industrial HMI terminals, network equipment serial consoles, and medical diagnostic interfaces requiring stable component supply across extended product lifecycles.
Supply support for PI7C9X7952BFDE 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 connectivity solutions for industrial, computing, and communications markets.
The PI7C9X7952BFDE belongs to Diodes' PCI Express bridge IC product line, engineered specifically to extend legacy serial infrastructure into modern PCIe-based platforms while maintaining full software compatibility with existing 16550/16C950 driver stacks.
FAQ
Does PI7C9X7952BFDE require external EEPROM to function?
No. The IC operates with default configuration values stored in internal ROM if no external EEPROM is present. However, EEPROM is required to customize vendor/device IDs, subsystem IDs, and GPIO initialization states-essential for certified board-level compliance and driver recognition in production systems.
What is the maximum supported baud rate with 25 MHz crystal input?
With a 25 MHz crystal and minimum divisor (1), the theoretical maximum is 15.625 Mbps. The datasheet specifies 15 Mbps as the validated maximum due to timing margin requirements across process/voltage/temperature corners-confirmed by UART loopback testing at 15 Mbps with 128-byte FIFOs enabled.
Can both UART channels operate simultaneously at different baud rates?
Yes. Each UART has independent baud rate generators, divisors, and FIFO control registers. Channel A and Channel B can be configured for distinct protocols-for example, 9600 bps Modbus RTU on UART0 and 115200 bps debug console on UART1-without cross-interference or shared clock constraints.
Is PI7C9X7952BFDE compatible with Linux kernel serial drivers?
Yes. It enumerates as a standard PCI serial device (class 0x070002) and is natively supported by the Linux 8250_pci driver since kernel v2.6.32. No custom driver is needed-the device appears as ttyS0/ttyS1 with full ioctl() support for RTS/CTS, modem control, and custom baud rates.
PI7C9X7952BFDE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 128-LQFP
- Programmable:
- Not Verified
- Protocol:
- PCI
- Function:
- Bridge, PCI to UART
- Interface:
- UART
- Standards:
- -
- Voltage - Supply:
- 1.8V, 3.3V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 128-LQFP (14x14)
- Grade:
- -
- Qualification:
- -
PI7C9X7952BFDE FAQ
1.How can I place an order for PI7C9X7952BFDE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI7C9X7952BFDE 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 PI7C9X7952BFDE reliable?
The price and inventory of PI7C9X7952BFDE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7C9X7952BFDE is usually 5 days.
3.What payment methods are accepted for PI7C9X7952BFDE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7C9X7952BFDE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI7C9X7952BFDE?
PI7C9X7952BFDE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI7C9X7952BFDE 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 PI7C9X7952BFDE?
For technical support, including PI7C9X7952BFDE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7C9X7952BFDE requirements.
6.How does Aetrix verify that PI7C9X7952BFDE is sourced from the original manufacturer or authorized distributors?
All PI7C9X7952BFDE 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 PI7C9X7952BFDE meets industry standards.
7.What is the process for return or replacement of PI7C9X7952BFDE?
All PI7C9X7952BFDE units undergo pre-shipment inspection (PSI). If there is an issue with PI7C9X7952BFDE, 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 PI7C9X7952BFDE part is unused and in its original packaging.
Return procedure for PI7C9X7952BFDE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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