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IO821: Precision timing module with optional GPS

Precision timing module with IRIG and 1PPS interfaces

This I/O module offers versatile support for the IRIG and 1PPS interfaces, and features GPS and a high-precision oven-controlled crystal oscillator (OCXO) as options.

The I/O module can be used to generate an interrupt which triggers the Simulink model at very precise intervals.


  • External references include IRIG DCLS and AM, 1PPS (pulse-per-second), and GPS (option)
  • Outputs include IRIG DCLS, IRIG AM, 1PPS and a 10 MHz sine wave.
  • Auto-detects and prioritizes references
  • Universal signaling voltage (3.3 V and 5 V)
  • Optional high precision OCXO (oven-controlled crystal oscillator) internal clock
Form factor PMC
Power requirements +5 VDC ±5% @ 1.4 A typical
+3.3 VDC ±5% @ 0.7 A typical
+12 VDC ±8% @ 0.2 A typical
-12 VDC ±5% @ 0.2 A typical
PMC bus 32 bit / 66 MHz
Operating temperature -40°C to +80°C
Relative humidity to 95%
Electromagnetic interference immunity (EMI) Certifications: RoHS, CE, FCC Class A
Reference interfaces  
Inputs GNSS, IRIG (AM or DCLS), 1PPS, GPS (option)
Outputs IRIG (AM or DCLS), 1PPS, Periodic TTL (10 MHz - 0.05 Hz), 10 MHz sine wave
Item ID Product Name Components
2A821X IO821
  • IO821
  • Breakout cable
  • Driver block library for Simulink Real-Time
  • Installation into real-time target machine
2B821X IO821
  • IO821 with high-precision OCXO and GPS
  • Breakout cable
  • Driver block library for Simulink Real-Time
  • Installation into real-time target machine

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

  • I/O module installed into real-time target machine
  • Cable
  • Simulink driver blocks
  • Test models
  • Comprehensive documentation

Supported target machines