The latest rev of the CSAC data sheet (rev H) shows the max
non-operating temperature to be 40C..
and operating from -10 to +35C
that's a substantial difference from the former version of the sheet
which presumably had the temperatures from the summary page:
The Quantum SA.45s Chip Scale Atomic Clock (CSAC) is available in the
following versions:
Option 001, operates from -10 °C to +70 °C with an output frequency
of 10 MHz, ADEV = 2.5E-10 (tau = 1 sec)
Option 002, operates from -40 °C to +85 °C with an output frequency
of 10 MHz , ADEV = 2.5E-10 (tau=1 sec)
Option 003, operates from -10 °C to +70 °C with an output frequency
of 16.384 MHz, ADEV = 2.5E-10 (tau = 1 sec)
Option 004, operates from -10 °C to +70 °C with an output frequency
of 10.24 MHz, ADEV = 2.5E-10 (tau = 1 sec)
Option 006, operates from -10 °C to +70 °C with an output frequency
of 5 MHz, ADEV = 2.5E-10 (tau = 1 sec)
Rev H appears to be 121014 (12 October or 10 Dec 2014, I'd guess)
http://www.microsemi.com/document-portal/doc_download/133305-quantum-sa-45s-csac
I wonder what happened? Is it a typo? are they seeing high temperature
failures?
As a practical matter, a max operating temp of 35 and storage/ship of 40
would make me nervous about shipping one in midsummer in California..
That brown UPS truck gets pretty toasty warm, and 40C is easily
achieved, although fairly unusual for "in the shade air temp"
And, of course, makes it useless for outdoor applications of any kind.
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