[time-nuts] FE-5680A

Peter Bell bell.peter at gmail.com
Thu Nov 10 17:02:49 EST 2011

Assuming it's the same as the units I have (two labels, with "FEI P/N
217400-30352-1" on the upper label and two barcodes on the lower
label) then the +5V supply runs all the logic in the unit. There are
no special power sequencing requirements, but you need both supplies
for the unit to operate. The current drain on the 5V line is fairly
low - about 90mA - the 15V will pull about 2A when the unit is cold
and then drops to 500-600mA once everything is warmed up.  Pin 3 is
the lock indicator - driven low when locked.  The output (10MHz sine)
is present on pin 6, and appears immediately after power up - although
the frequency is not accurate until the lock pin is asserted.

The 4 digit prefix on the lower barcode is a date code - so "S/N
0416-77234" would indicate a unit made in week 16 of 2004.


Pete Bell

On Fri, Nov 11, 2011 at 12:30 AM,  <EWKehren at aol.com> wrote:
> I did purchase one of the "New"  FE-5680A Rb's. Looking at packaging  and
> the housing it does look new. I have not powered it up because of +5  Volt on
> pin 4. Does any one know its purpose and is there a power up  sequence. Any
> help will be appreciated.
> Bert Kehren  Miami
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