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Diodes Incorporated PI7C9X7952AFDE
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- Part No.:
- PI7C9X7952AFDE
- Manufacturer:
- Diodes Incorporated
- Category:
- Controllers
- Package:
- 128-LQFP
- Datasheet:
-
PI7C9X7952AFDE.pdf
- Description:
- IC PCIE-TO-UART BRIDGE 128LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,084
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Product details
Overview
PI7C9X7952AFDE from Pericom Semiconductor is a PCI Express® 1.0a-compliant dual UART bridge IC that converts PCIe serial data to two independent RS-232/422/485-compatible asynchronous serial streams. It integrates dual 128-byte FIFOs, programmable baud rates up to 15 Mbps, and supports both I/O-mapped and memory-mapped register access. Used in industrial PC add-in cards for legacy serial device connectivity.
For engineers reviewing the PI7C9X7952AFDE datasheet, PI7C9X7952AFDE pinout, PI7C9X7952AFDE application, or PI7C9X7952AFDE equivalent, key selection criteria include PCIe Gen1 x1 link compliance, dual UART channel independence, FIFO depth, integrated clock synthesis, and EEPROM-based configuration storage.
Technical Context
The device implements a PCIe endpoint with Type 0 Configuration Space, supporting MSI and legacy INTA# interrupts. Its UART subsystem conforms to 16550A/16750 register compatibility and includes enhanced features like automated flow control, internal loopback, and crystal oscillator input (14.7456 MHz).
It operates in three UART modes: standard 450/550 mode, Enhanced 550 Mode (with extended FIFO and modem control), and Enhanced 950 Mode (supporting 9-bit framing and additional status bits). Power management includes D0–D3hot states per PCIe specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PCIe Interface | PCI Express 1.0a, x1 lane, 2.5 GT/s, endpoint configuration |
| UART Channels | Dual independent UARTs, each with 128-byte TX/RX FIFO |
| Baud Rate Range | 50 bps to 15 Mbps, programmable via 16-bit divisor with fractional prescaler |
| Register Compatibility | Fully compatible with 16550A/16750 register map in I/O and memory-mapped modes |
| Crystal Input | 14.7456 MHz fundamental-mode crystal oscillator input (CLKINP/CLKINN) |
| EEPROM Interface | 2-wire serial interface (SR_DO/SR_DI) supporting 128-byte configuration storage |
| Operating Temp | −40°C to +85°C industrial temperature range |
Pinout & Package
Package: 128-pin LQFP (20 mm × 20 mm, 0.4 mm pitch), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKINP / CLKINN | Differential crystal oscillator input | Accepts 14.7456 MHz fundamental-mode crystal; enables on-chip clock synthesis for UART baud generation |
| TXD0 / RXD0 / RTS0 / CTS0 / DTR0 / DSR0 / DCD0 / RI0 | UART0 serial interface signals | Full modem control set for first UART channel; supports RS-232/422/485 level translation externally |
| TXD1 / RXD1 / RTS1 / CTS1 / DTR1 / DSR1 / DCD1 / RI1 | UART1 serial interface signals | Independent second UART channel with identical signal set and register mapping |
| PERST# / REFCLK+ / REFCLK− / PETCLK+ / PETCLK− | PCIe physical layer interface | Supports PCIe 1.0a x1 link; PERST# resets PCIe logic; REFCLK provides reference timing |
| SR_DO / SR_DI | Serial EEPROM data I/O | 2-wire interface for loading device configuration (vendor ID, subsystem ID, GPIO defaults) at power-up |
| GPIO[7:0] | General-purpose I/O | Configurable as inputs/outputs; used for board-level signaling, status indication, or auxiliary control |
Key Features
| Feature | Design Value |
|---|---|
| Dual 128-byte FIFOs | Reduces CPU interrupt load and prevents data loss during high-speed serial bursts (up to 15 Mbps per channel) |
| Enhanced 950 Mode | Enables 9-bit data framing and extended status reporting for protocol-specific applications (e.g., Modbus RTU) |
| Automated Flow Control | Hardware-driven RTS/CTS assertion based on FIFO fill level-no software polling required |
| Internal Loopback Support | Per-channel digital loopback mode for driver validation and diagnostic testing without external cabling |
| EEPROM-Based Configuration | Stores PCIe vendor/device IDs, subsystem IDs, and GPIO defaults-enables plug-and-play operation without host BIOS changes |
Applications
| Industrial HMI Terminal Interface | POS System Serial Peripheral Hub |
|---|---|
Use Scenario: Connecting legacy RS-232 barcode scanners, receipt printers, and magnetic stripe readers to modern PCIe-based point-of-sale motherboards. IC Role / Device Role / Timing Role: PCIe-to-dual-UART bridge enabling concurrent full-duplex communication across two independent serial peripherals. Use Value: Eliminates need for discrete UART controllers and PCIe switch logic; maintains backward compatibility while leveraging high-bandwidth PCIe interconnect. | Use Scenario: Integrating multiple RS-485 field devices (e.g., scales, cash drawers, customer displays) into a single PCIe add-in card for retail kiosks. IC Role / Device Role / Timing Role: Dual UART with hardware flow control and 14.7456 MHz crystal-derived timing ensures deterministic latency and jitter-free serial framing. Use Value: Enables synchronized multi-peripheral polling without CPU overhead; 128-byte FIFOs absorb burst traffic from concurrent devices. |
| Medical Device Data Logger | Ruggedized Embedded Controller |
Use Scenario: Aggregating serial telemetry from ECG monitors, infusion pumps, and patient monitors into a central PCIe-based logging system. IC Role / Device Role / Timing Role: Industrial-temp-rated dual UART with EEPROM-stored configuration ensures reliable boot-time initialization in unattended medical equipment. Use Value: Supports fail-safe operation across −40°C to +85°C; automated flow control prevents data corruption during variable load conditions. | Use Scenario: Adding serial debug and sensor interfaces to fanless embedded controllers deployed in transportation or energy infrastructure. IC Role / Device Role / Timing Role: PCIe endpoint providing two isolated UART channels with GPIO-assisted board-level reset and status signaling. Use Value: GPIO[7:0] pins enable custom board-level integration (e.g., watchdog trigger, LED indicators); no external glue logic required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCIe-to-dual-UART bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Exar XR17V352IL24-F | PCIe 2.0 x1, 256-byte FIFOs per channel, integrated voltage regulators, supports 32-MHz crystal | Higher bandwidth and deeper FIFOs; requires different power sequencing and layout | Select when upgrading to PCIe Gen2 or requiring >15 Mbps baud rates and lower software latency |
| MaxLinear XR17V352IL24-F | Same silicon as Exar part (post-acquisition); identical electrical specs and pinout | No functional difference; branding and supply chain distinction only | Preferred where MaxLinear distribution channels offer better lead times or volume pricing |
Compared with PI7C9X7952AFDE, the XR17V352 offers PCIe Gen2 support and larger FIFOs but lacks native EEPROM configuration storage-requiring host firmware initialization-and targets newer designs where legacy 16550A compatibility is secondary to throughput.
Availability
PI7C9X7952AFDE is available at Aetrix Electronics and suitable for industrial HMI terminals, POS system peripheral hubs, medical data loggers, and ruggedized embedded controllers requiring stable component supply and long-term lifecycle support.
Supply support for PI7C9X7952AFDE 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 was a fabless provider of high-performance interface, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2017. Known for PCIe, USB, and legacy bus bridge ICs.
The PI7C9X7952 belongs to Pericom's PCI Express bridge product line, designed specifically to extend legacy serial connectivity into modern PCIe-based computing platforms while maintaining strict 16550A register compatibility and industrial reliability.
FAQ
What PCIe specification version and lane count does PI7C9X7952AFDE support?
PI7C9X7952AFDE complies with PCI Express Base Specification Revision 1.0a and operates as a x1 lane endpoint device. It supports 2.5 GT/s signaling, Link Training and Status State Machine (LTSSM), and full PCIe power management states (D0–D3hot). It does not support PCIe 2.0 or higher revisions.
Does PI7C9X7952AFDE require an external crystal, and what frequency is specified?
Yes, it requires a 14.7456 MHz fundamental-mode crystal connected across CLKINP and CLKINN pins. This frequency is fixed for internal baud rate generation and UART timing; no other crystal frequencies are supported per datasheet Section 5.2.11 and Figure 5-3.
How is device configuration stored, and what parameters can be programmed via EEPROM?
Configuration is stored in an external 2-wire serial EEPROM interfaced via SR_DO and SR_DI pins. The EEPROM holds PCIe vendor/device IDs, subsystem vendor/device IDs, GPIO default states, and UART mode settings-loaded automatically at power-up per Section 4.2.5 and Section 6.2.46.
Can both UART channels operate simultaneously at different baud rates and data formats?
Yes. Each UART channel has independent divisor latch registers (DLL/DLH), line control registers (LCR), and FIFO control logic. They support simultaneous operation at different baud rates (50 bps–15 Mbps), data lengths (5–9 bits), parity schemes, and stop bit counts-verified in Sections 5.2.12 and 7.1–7.2 of the datasheet.
PI7C9X7952AFDE 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:
- -
PI7C9X7952AFDE FAQ
1.How can I place an order for PI7C9X7952AFDE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI7C9X7952AFDE 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 PI7C9X7952AFDE reliable?
The price and inventory of PI7C9X7952AFDE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7C9X7952AFDE is usually 5 days.
3.What payment methods are accepted for PI7C9X7952AFDE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7C9X7952AFDE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI7C9X7952AFDE?
PI7C9X7952AFDE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI7C9X7952AFDE 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 PI7C9X7952AFDE?
For technical support, including PI7C9X7952AFDE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7C9X7952AFDE requirements.
6.How does Aetrix verify that PI7C9X7952AFDE is sourced from the original manufacturer or authorized distributors?
All PI7C9X7952AFDE 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 PI7C9X7952AFDE meets industry standards.
7.What is the process for return or replacement of PI7C9X7952AFDE?
All PI7C9X7952AFDE units undergo pre-shipment inspection (PSI). If there is an issue with PI7C9X7952AFDE, 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 PI7C9X7952AFDE part is unused and in its original packaging.
Return procedure for PI7C9X7952AFDE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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