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PCI Dual UART I/O Bridge

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Product Description

The PI7C8952 is a PCI® Dual UART (Universal Asynchronous Receiver-Transmitters) I/O Bridge. It is specifically designed to meet various system requirements of high performance and lead (Pb) -free. The bridge can be used in a wide range of applications such as Remote Access Servers, Automation, Process Control, Instrumentation, POS, ATM and Multi-port RS232/RS422/RS485 Cards. The PI7C8952 provides standard PCI® connection, and it is fully compliant with 32-bit PCI Bus 2.3 specifications. The bridge supports two high performance UARTs, each of which supports Baud rate up to 15 Mbps in asynchronous mode.
The UARTs support in-band and out-band auto flow control, arbitrary trigger level, I/O mapping and memory mapping,m IrDA (Infrared Data Association) encoder/decoder, 8 general purpose I/O and 16-bit timer counter. The PI7C8952 is fully software compatible with 16C550 type device drivers and can be configured to fit the requirements of RS232, RS422 and RS485 applications. The EEPROM interface is provided for system implementation convenience. Some registers can be pre-programmed via hardware pin settings to facilitate system initialization. For programming flexibility, all of the default configuration registers can be overwritten by EEPROM data, such as sub-vendor and sub-system ID.

Industry Specifications Compliance

PCI Specification, Revision 2.3 compliance


  • Two high performance 950-class UARTs
  • Universal PCI Bus Buffers – Auto sense 3.3V or 5V operation
  • Fully 16C550 software compatible UARTs
  • 128-byte FIFO for each transmitter and receiver
  • Baud rate up to 15 Mbps in asynchronous mode
  • Flexible clock prescaler from 4 to 46
  • Data Transfer in Byte, Word and Double-word
  • Data Read/Write Burst Operation
  • Automated in-band flow control using programmable Xon/Xoff in both directions
  • Automated out-of-band flow control using CTS#/RTS# and/or DSR#/DTR#
  • Arbitrary trigger levels for receiver and transmitter FIFO interrupts and automatic in-band and out-band flow control
  • Global Interrupt Status and readable FIFO levels to facilitate implementation of efficient device drivers
  • Detection of bad data in the receiver FIFO
  • Data framing size including 5, 6, 7, 8 and 9 bits
  • Infrared (IrDA 1.0/1.1) Data Encoder/Decoder
  • Auto RS-485 Half-duplex Output with Control Polarity Selector
  • Eight General Purpose Inputs/Outputs
  • A General Purpose 16-bit Timer/Counter
  • Hardware reconfiguration through EEPROM
  • Operations via I/O or memory mapping
  • Sleep Mode with Automatic Wake-up
  • Dual power operation (3.3V or 5.0V for PCI I/O and
    1.8V-5.0V for UART I/O)
  • Power dissipation: 150 mW typical in normal mode
  • Industrial Temperature Range -40o to 85o
  • Package: 14x14mm, 100-pin LQFP, w/0.5mm pin pitch -
    Pb free and 100% Green.

Software support

  • MicrosoftTM Windows 2003/XP/Vista/Windows Embedded/Windows 8/Windows 8.1/Windows 10 32/64 bit
  • MicrosoftTM Windows CE 6.0
  • Linux 2.6, RedHat 6.5 and above


  • Remote Access Servers
  • Network / Storage Management
  • Factory Automation and Process Control
  • Instrumentation
  • Multi-port RS-232/ RS-422/ RS-485 Cards
  • Point-of-Sale Systems (PoS)
  • Industrial Control (IPC)
  • Gaming Machines
  • Building Automation
  • Embedded Systems

Note: If you would like to get source codes of the Linux driver of PCI/PCIE to UART (including PI7C9X7958/54/52 and PI7C8958/54/52), please send a request on our website, and a representative will contact you for the support: Contact Support.


Product Specifications

Product Parameters

Ports 2 UART
Pins 100
Data Rate (kbps) 15Mbps
Bytes 128
Tx/Rx FIFO Ctrs Yes
Tx/Rx FIFO INT Trig Yes
Auto RTS/CTS Yes
Interface PCI
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

Design tool model software

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

Request Documents
Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
Contact Sales
Request Samples
Qty. Carrier
PI7C8952AFAE Active T-QFP140140-100 TPGP 90 TRAY Contact Sales Request Sample
PI7C8952AFAEX Active T-QFP140140-100 TPGP 1000 T&R Contact Sales Request Sample

Environmental Compliance Legend:
LFF: Pb-Free Finish and RoHS 5/6
TLFP: Totally Pb-Free Product and RoHS 6/6
LFGP: Pb-free Finish and Green Product, RoHS 5/6 and Halogen Free
TPGP: Totally Pb-Free and Green Product, RoHS 6/6 and Halogen Free
GREEN: Halogen-free and RoHS compliant
RoHS: RoHS compliant but NOT halogen-free