Chip Scale Atomic Clock (CSAC)


Chip Scale Atomic Clock (CSAC)
To order, please visit Microchip Direct.

Unmatched combination of breakthroughs - reduced Size, Weight and Power consumption (SWaP) - brings the accuracy and stability of atomic clocks to portable applications.

The Microsemi SA.45s CSAC is the world's first commercially available chip scale atomic clock, providing the accuracy and stability of atomic clock technology while achieving true breakthroughs in reduced size, weight and power consumption.

New for 2018: A RoHS-compliant version is available with a wider storage temperature. Suitable for applications requiring lead-free components.

CSAC Key Features

  • < 120mW power consumption
  • < 17cm3 volume
  • 35g weight
  • ±5.0E-11 accuracy at shipment
  • <1E-11 @1000s Short Term Stability (Allan Deviation)
  • <9E-10 /mo Aging Rate (Typical)
  • -10oC to +70oC Operating Temperature
  • 10MHz square wave and 1PPS, both in a CMOS 0V to 3.3V format.
  • 1PPS input for synchronization
  • RS-232 interface for monitoring and control
  • Chip Scale Atomic Clock Video
  • Space version available (090-02984-007)
  • Lead-free (RoHS compliant) version now also available (090-03240-001 and -003)

A New Class of Applications
At two orders of magnitude better accuracy than oven-controlled crystal oscillators (OCXOs) - and up to four orders of magnitude better accuracy than temperature-controlled oscillators (TCXOs) - the CSAC's unmatched portability opens the door to new classes of applications, such as:

CSAC Development Kit

CSAC Developer's Kit (990-00123-000)

  • HW platform to evaluate CSAC
  • On board socket for CSAC
  • HW included to allow mounting of evaluation board
  • Wall socket power supply
  • RS-232 cable to connect PC to evaluation board


  • Consult product data sheet for part number descriptions


User Guides


White Papers

CSAC Demo The Microsemi "CSACdemo" software (Part # 084-00365-000) provides a convenient graphical user interface for monitoring and controlling the SA.45s CSAC. "CSACdemo" also is used for collecting and archiving monitor data from the CSAC. It can be installed and run on any PC running Microsoft Windows XP or Windows 7 and having at least one available RS232 (COM) port. Note: Multiple CSACs can be monitored from a single PC, provided additional COM ports are available.

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