Looking for one-time programmable 5V CMOS oscillators (likely to be ordered from DigiKey).

Looking at, for example, ECS-P85-B.

I am a little confused on what I am actually going to get?

Say I order 148.500 MHz. Am I going to get an oscillator that initially (out of the box, at room temperature) is somewhere between 148.492MHz and 148.5074MHz (+-50ppm)? Or will it be closer to my specified frequency.

Now what happens as the temperature changes and the module ages? How far from whatever I initially get does the frequency shift?

 

Just as it says.

You will get your specified frequency with the given tolerances.

http://www.digikey.com/catalog/en/partgroup/ecs-p83-p85-series-with-ordering-guide/5049?mpart=ECS-P85-B&vendor=50&WT.z_ref_page_type=PS&WT.z_ref_page_sub_type=PD&WT.z_ref_page_id=PD&WT.z_ref_page_event=DC_Link_Table

 

Hello,

Why would you go for a one time programmable, when an i2c programmable oscillators are available.
Have a look at this page:
http://www.silabs.com/products/clocksoscillators/oscillators/Pages/i2c-oscillator.aspx

Bertus