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Home >> Products >> I/O Connectivity ICs >> USB Bridge >> AX78140

 AX78140 -- USB 2.0 to Multi I/O (4S, 2S+1P) Controller

With the rapid proliferation of USB interface in the embedded world, developers are looking for easiest ways to add USB to microcontroller-based applications in their design. ASIX’s new AX781x0 family features four USB connectivity bridge solutions including USB 2.0 to Single Serial (AX78120), USB 2.0 to Dual Serial (AX78120), USB 2.0 to Quad Serial (AX78140) and USB 2.0 to Dual Serial and Single Parallel (AX78140) controllers. Enabling smooth migration from legacy system using ASIX’s MCS78x0 series, AX78120/AX78140 provide pin-to-pin compatible and driver backward compatible with MCS7810/MCS7820/MCS7840.

AX78140 is a USB 2.0 to Multi I/O (4S, 2S+1P) Controller. It has been developed to connect a wide range of standard serial devices to a USB host.

The AX78140’s support for the following serial communication program are included: HyperTerminal, PComm, Windows direct connection, Windows dial-up connection through modem, Networking over IrDA and Windows direct connection over IrDA, Minicom.

The AX78140, in 64-pin LQFP, are available with RoHS compliant package and supports commercial grade operating temperature range from 0 to 70°C and industrial grade from -40 to 85°C.


  • Single chip USB 2.0 to Multi I/O (4S, 2S+1P) Controller
  • USB Device Controller
    • Integrates on-chip USB 2.0 PHY and controller compliant to USB Spec 2.0 and 1.1
    • Supports all USB 2.0 power saving modes (L1, L2)
    • Supports USB High/Full Speed modes with Bus-power or Self-power device auto-detect capability
    • Supports USB LPM (Link Power Management)
  • Dual/Quad Serial Port Controller
    • Two/four 16c450/16c550 compatible UARTs
    • Supports SIR IrDA mode on any/all ports
    • Supports RS-232, RS-422 and RS-485 serial ports
    • Supports multi-protocol serial transceivers
    • Supports 5, 6, 7 & 8 bit serial data
    • Supports automatic data direction control
    • Supports multi-drop mode with auto address detection
    • Supports hardware and software flow control
    • Supports baud rates from 50bps to 6Mbps
    • Supports custom baud rates from external clock
    • On-Chip 1024-Byte FIFO for upstream and 512-Byte for downstream data transfer for each Serial Port
    • I²C interface for EEPROM
    • Supports read/write EEPROM through USB interface
    • On-Chip buffers for serial port signals to operate without external transceivers over short cable
    • Pin-to-Pin compatible with MCS7810/MCS7820/MCS7840
    • Driver backward compatible with MCS7810/MCS7820/MCS7840
  • Support Remote Wake Up Function
    • Supports Suspend Mode and Remote Wakeup via RXD, RI, DSR, DCD and CTS pin
  • Advanced Power Management Features
    • Supports USB LPM (Link Power Management)
    • Supports remote wake up re-trigger
  • Parallel Port
    • AX78140 supports optional 2 Serial Port and 1 Parallel Port configuration
    • On-Chip 1024-Byte FIFO for upstream and 512-Byte for downstream data transfer for Parallel Port
  • GPIO
    • AX78140 supports 1 GPIO pin and 16 optional software controlled GPIO pins
  • Integrates on-chip 1.8V and 3.3V voltage regulator and only requires a single 5V power supply
  • Single 12MHz clock input from either crystal or oscillator source
  • Integrates on-chip power-on reset circuit
  • Small form factor with 64-pin LQFP RoHS compliant package
  • Operating over 0°C to 70°C or -40°C to +85°C temperature range
Target Applications:
  • Serial Attached Devices
  • Serial Networking / Monitoring Equipment
  • Data Acquisition System
  • POS Terminal & Industrial PC
  • Parallel / Printer Port based applications

 Block Diagram


 Selection Guide


 Development Board

AX78140 USB 2.0 to 4S Demo Board  Available
 This is an AX78140 USB 2.0 to 4S adapter for users to evaluate AX78140 USB 2.0 to 4S functionalities
AX78140 USB 2.0 to 2S1P Demo Board  Available
 This is an AX78140 USB 2.0 to 2S1P adapter for users to evaluate AX78140 USB 2.0 to 2S1P functionalities.

Technical Documentation

 Product Brief, Product Introduction and Datasheet

AX78140 Brief316.6 KB2017-12-08
AX78140 Product Introduction 1.1 MB2017-03-14
AX78140 Datasheet 1.4 MB2017-12-07
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 Reference Manuals and User Guides

AX78140 EEPROM User Guide   
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AX78140 Reliability Report 252.7 KB2016-10-14
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AX78140 RoHS Report   
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Hardware Design Documentation

 Reference Schematics

AX78140 USB 2.0 to 4S Demo Board Reference Schematic 309.7 KBV1.002016-04-26
AX78140 USB 2.0 to 2S1P Demo Board Reference Schematic 326.7 KBV1.102016-05-26

 Bill of Materials, Application Notes and Layout Guides

AX78140 USB 2.0 to 4S Demo Board BOM File 190 KB2016-06-22
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AX78140 USB 2.0 to 2S1P Demo Board BOM File 190.7 KB2016-06-22
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AX78140 Application Design Note 1020.4 KBV1.002016-06-24
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 PCB Layout, Gerber and IBIS Model

AX78140 USB 2.0 to 4S/2S1P Demo Boards PCB Layout Files 576.7 KB2016-02-26
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AX78140 USB 2.0 to 4S/2S1P Demo Boards Gerber Files 1.2 MB2016-02-26
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AX78140 IBIS Model 392.9 KB2016-09-14
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Windows EEPROM Utility   
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Windows MP Tool   
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Driver TypeRevision Release DateDescriptionFile Size
Linux kernel 4.x/3.x/2.6.x Driver V3.4.02018-09-28 For all Android systems, Linux kernel 2.6.15 and later32.2 KB
Windows 10 32-bit Driver V3.20.6.02019-05-13 For x86 CPU platform, HLK/WHCK certified851.5 KB
Windows 10 64-bit Driver V3.20.6.02019-05-13 For x64 CPU platform, HLK/WHCK certified952.3 KB
Windows 8.x 32-bit Driver V3.18.6.02018-11-14 For 32-bit x86 CPU platform, HLK/WHCK certified898.2 KB
Windows 8.x 64-bit Driver V3.18.6.02018-11-14 For 64-bit x86 CPU platform, HLK/WHCK certified1 MB
Windows 7/Vista/XP 32-bit Driver V3.12.6.02018-11-14 For 32-bit x86 CPU platform, WHCK certified1.1 MB
Windows 7/Vista/XP 64-bit Driver V3.12.6.02018-11-14 For 64-bit x86 CPU platform, WHCK certified1.2 MB


click here for more AX78140 FAQs....
Q0001: Is AX78140 IC pin-to-pin compatible to MCS7840 IC?
A0001: Yes, AX78140 IC is pin-to-pin compatible to MCS7840 IC.

Q0002: Where can I obtain the latest AX78140 datasheet, reference schematic and other hardware design archives?
A0002: Please register MyASIX membership ( and then download the latest AX78140 datasheet, reference schematic, PCB layout guide, etc. from AX78140 Product web page (;74;109&PLine=74) directly.

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