Tent clock output voltage and DCX2496

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Just wondering whether the output of a Tent clock should be set at 5V or 3.3V when used with the DCX2496. On the DCX schematics the existing clock is powered from 5V. Regarding what the clock feeds, the 8420 converter is powered from 5v, but everything else runs off 3.3v. There is a 22R resistor on the output of the clock....

Can someone shed some light on this.

Thanks.
 
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