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I want to use this clock oscillator

http://www.ecsxtal.com/store/pdf/ecs-2100x.pdf

It does not require loading capacitance.

However, it says "3.3V operation (optional)", yet on the same page it says "Supply Voltage: 5VDC +/- 0.25".

I was considering just throwing it in a breadboard, giving it 3.3V, and scoping the output pin to see if it worked. But I was wondering if I would have any problems since the output pin would be unloaded, except for the scope.

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I often check oscillators like that without a load. You might notice some ringing on the edges.

The optional 3.3V means that they can supply a low-voltage version.

I've occasionally used a 5V CMOS oscillator at 3.3V in a prototype when I haven't had a suitable 3.3V device, they've always worked.

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  • \$\begingroup\$ There is nothing in the datasheet or on digikey's parametric search that indicates this part has a low-voltage version. The only alternate part numbers control for the frequency stability. \$\endgroup\$ – ajs410 May 2 '11 at 22:34
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    \$\begingroup\$ You have to order the low-voltage version from the supplier, as a non-standard item. It will probably be more expensive. Plenty of 3.3V oscillators are available as standard items. \$\endgroup\$ – Leon Heller May 2 '11 at 23:01
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    \$\begingroup\$ I tried giving it 3.3V and it oscillated quite happy at the correct frequency. And with a littie bit of ringing, too. \$\endgroup\$ – ajs410 May 3 '11 at 15:36

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