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IO203: Digital I/O Module with 64 TTL Channels

Parallel digital I/O module with 64 TTL channels, individually programmable as inputs or outputs

The IO203 I/O module is a dedicated digital I/O module providing a total of 64 TTL channels. The transceivers are TTL and CMOS/TTL compatible and can also be set to be CMOS compliant by on-board jumper.

Each of the 64 channels can be individually programmed as input or output. The 64 channels are also separated into two groups of 32 channels. The module supports a simultaneous update of each group resulting in very low latency.

This I/O module is ideal for closed-loop controls and hardware-in-the-loop (HIL) simulations using MATLAB® and Simulink®.

Digital Inputs/Outputs

  • 64 TTL channels, grouped into 2x 32 channels
  • Each channel can be individually programmed as input or output
  • TTL, CMOS/TTL, CMOS-compatible transceivers
  • Pull-up resistor on each TTL I/O line handling 3.3 V or 5 V
Form factor PMC
Power requirments 0.7 W max 45 mA typical (no load) @ +5 V DC
Electrical interface 32-bit, 33MHz
Connector 68-pin SCSI3
Cable connectors: Tyco Electronics
Board connector: Tyco Electronics part no. 5749069-7
Operating temperature -40 to +85°C
Humidity 5 to 95% non-condensing
Digital I/O  
Configuration 64 channels, each channel individually programmable as input or output
Compatibility TTL (TTL, CMOS/TTL, CMOS)
Maximum current ±24 mA
Transceiver 74LVT126
Protection ESD and overvoltage for each channel
Mean time between failures (MTBF)* 419,000 hours
*MTBF values shown are based on calculation according to MIL-HDBK-217F and MIL-HDBK-217F Notice 2. Environment GB 20°C. The MTBF calculation is based on component FIT rates provided by the component suppliers. If FIT rates are not available, MIL-HDBK-217F and MIL-HDBK-217F Notice 2 formulas are used for the FIT rate calculation.
Item ID Product Name Components
20203X IO203
  • 1 x IO203 I/O module
  • 1 x 68-pin male SCSI3 to 68-pin male MDR cable, (6 ft/1.82 m)
  • 1 x 68-pin female MDR terminal board
  • Driver block library for Simulink® Real-Time™
  • Comprehensive documentation and Simulink® example models
  • Installation into the real-time target machine
Item ID Product Name Components
20203M IO203-BNC-Panel

4U aluminum BNC panel for the IO203 I/O module providing 64 BNC connectors to access 64 TTL lines


20203N IO203-BNC-Box Aluminum BNC box for the IO203 I/O module providing 64 BNC connectors to access 64 TTL lines

Key to X in Item ID
Please replace the X with the code number of the specific target machine into which this I/O module shall be installed:

  • 5 = Mobile real-time target machine
  • 6 = Performance real-time target machine
  • 8 = Baseline real-time target machine

Pricing information
We don't publish pricing information on our website. Upon request by e-mail or phone we can provide a complete price list covering our entire product portfolio in various currencies. We recommend that you get in touch with us to discuss your specific needs. We can then quickly provide you with a tailored quotation including technical and pricing information.


Included in delivery

Common Applications

  • Rapid control prototyping
  • Hardware-in-the-loop (HIL) simulation


Supported target machines


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