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Home >> Products >> I/O Connectivity ICs >> PCI Bridge >> MCS9865

 MCS9865 -- PCI to Multi IO (2S+1P, 2P, ISA) Controller

MCS9865 is a PCI based Peripheral Controller. It supports dual-channel high performance Serial Ports, dual enhanced IEEE 1284 compliant parallel ports and an ISA style interface. MCS9865 is ideally suited for Desktop PC and Notebook applications, such as PCI / Mini-PCI add-in Cards for high-speed Serial / Parallel Port expansion.

The PCI interface of MCS9865 is fully Compliant with PCI Local Bus Specification, Revision 2.3. It supports five functions through single device.

On-Chip Serial Ports of MCS9865 support extended 16C550 UART mode and support serial speeds up to 16Mbps. MCS9865 has 256 byte deep Transmit and Receive FIFO for each UART. Deep FIFOs enable high serial speeds / throughputs and reduce CPU Utilization. Each Serial Port is compatible with industry standard 16C550 devices including Standard COM Port of Industrial PC, ASIX family of UARTs like MCS9901/ MCS9835 / MCS9845 / MCS9820 / MCS7840 / MCS7820 / MCS7720 / MCS7703.

The Parallel Port interface is an IEEE 1284 compliant SPP / PS2 / EPP / ECP Parallel Port that fully supports Centronics interface.


  • PCI
    • Fully compliant with PCI Local Bus Specification, Revision 2.3
    • Compatible for MiniPCI application requirements
    • Fully customizable PCI Configuration Space
    • Compatible with 3.3V and 5V PCI signaling
    • Supports PCI Power Management
  • Serial Port
    • Four 16C 450 / 550 / Extended 550 compatible UARTs
    • Supports RS232, RS485 & RS422 modes
    • Bi-directional Speeds from 50 bps to 16 Mbps / Port
    • Full Serial modem control
    • Supports Hardware, Software flow control
    • 5, 6, 7, 8, 9-bit Serial format support
    • Even, Odd, None, Space & Mark parity supported
    • Custom BAUD rate support with external clock / by programming internal PLL
    • On Chip deep 256 Byte FIFOs in Transmit & Receive paths of each Serial Port
    • Supports remote wakeup and power management features
    • Serial Port transceiver shutdown support
    • Supports Slow IrDA on all Serial Ports
  • IEEE1284 Parallel Port
    • Multi-mode IEEE1284 compliant controller (SPP, PS2, EPP, ECP)
    • Faster data rates up to 1.5Mbytes/sec for parallel port
  • ISA
    • ISA style I/O interface for extending UARTs & Parallel Ports
    • 8 bit data bus @ 8MHz
  • Miscellaneous
    • On-Chip Dual Voltage Regulator (5V to 3.3V & 1.8V)
    • Two-Wire I²C Interface for EEPROM
    • EEPROM read / write through PCI
    • Four bi-directional multi-function GPIO lines
    • On chip oscillator
    • Package : 128-Pin LQFP, RoHS
    • Operating Temperature : -40 to +85°C
Target Applications:
  • Serial Attached Devices
  • Serial Networking / Monitoring Equipment
  • Data Acquisition System
  • POS Terminal & Industrial PC
  • Parallel / Printer Port based applications
  • Add-On I/O Cards-Serial / Parallel
  • Embedded systems-For I/O expansion

 Block Diagram


 Selection Guide


Technical Documentation

 Product Brief, Product Introduction and Datasheet

MCS9865 Product Brief159.4 KB2008-05-09
MCS9865 Datasheet 1.4 MB2012-09-12
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MCS9865 Reliability Report 193 KB2011-12-07
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MCS9865 RoHS Report   
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Hardware Design Documentation

 Reference Schematics

MCS9865 PCI 1 Parallel Reference Schematic 369.1 KBv1.002011-08-18
MCS9865 PCI 1 Serial Reference Schematic 368.2 KBv1.002011-08-18
MCS9865 PCI 2 Parallel Reference Schematic 303.4 KBv1.002011-08-18
MCS9865 PCI 2 Serial + 1 Parallel Reference Schematic 404.8 KBv1.002011-08-18
MCS9865 PCI 2 Serial + 2 Parallel Reference Schematic 472.1 KBv1.002011-08-18
MCS9865 PCI 4 Serial + 1 Parallel Reference Schematic 374.2 KBv1.002011-08-18
MCS9865 PCI 6 Serial Reference Schematic 457.3 KBv1.002011-08-18

 Bill of Materials, Application Notes and Layout Guides

MCS9865 PCB Layout Guide 103.7 KBv1.002011-09-28
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 PCB Layout, Gerber and IBIS Model

MCS9865 IBIS Model 444.8 KB2011-11-14
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Driver TypeRevision Release DateDescriptionFile Size
FreeBSD 6.4 driver v1.0.0.12009-12-16 366.3 KB
FreeBSD 7.2 driver v1.0.0.12009-10-22 79.9 KB
Linux kernel 4.x/3.x/2.6.x Driver V2.2.02016-05-11 For all Android systems, Linux kernel 2.6.14 and later21.7 KB
Windows 10/8.x/7/Vista/XP 32-bit Driver V1.0.2.02014-02-10 For 32-bit x86 CPU platform, WHCK certified404.1 KB
Windows 10/8.x/7/Vista/XP 64-bit Driver V1.0.2.02014-02-10 For 64-bit x86 CPU platform, WHCK certified485.4 KB
Windows CE 5.0 / Mobile 5 / Mobile 6 Driver v1.0.0.22009-02-20 For CEPC x86 platform76 KB
Windows CE 6.0 Driver v1.0.0.22009-02-23 For CEPC x86 platform74.8 KB
DOS Configuration Tool v1.0.0.42009-03-03 For MS-DOS Legacy I/O Ports Configuration390.6 KB


click here for more MCS9865 FAQs....
Q0001: Where can I obtain the latest MCS9865 datasheet, reference schematic and other hardware design archives?
A0001: Please register MyASIX membership ( and then download the latest MCS9865 datasheet, reference schematic, PCB layout guide, etc. from MCS9865 Product web page (;74;111&PLine=74) directly.

Q0002: Can ASIX help me to review my own MCS9865 schematic and PCB layout?
A0002: Yes, please deliver your own MCS9865 schematic and PCB layout files to ASIX's Support ( for further review before making your own MCS9865 PCB board.

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