Hallo guys!
In the Silicon Labs Si5351A clock generator specification sheet I see two values ranges for the same parameter CORE SUPPLY VOLTAGE (VDD).
In the "short" features page I see:
Core VDD: 2.5 or 3.3 V
Than, when I go deeply at page (5 of 41) I see two ranges for "CORE SUPPLY VOLTAGE" Vdd, as you can see in the attached picture:
MIN TYP MAX
3.0 3.3 3.6
2.25 2.50 2.75
Is there anyone may explain me why they declare two ranges instead of one?
Thank you very much indeed.
Dear friend aarg, first and foremost thank you for quick reply.
I have not so much competences to understand 100% the matter of your reply, please accept my apologies.
You said "with transistor". I understand that one row is intended if I don't use a transistor, and one other row is intended (like you suggest) with transistor. What row is intended without transistor? The first above or the second below?
Thank you so much.
Roberto
TomGeorge:
Hi,
What the spec is telling you it will work with 2.5V OR 3.3V core voltage supply.
The reason is there are 2.5V and 3.3V systems that use the Si5351A.
Tom...
Then how do you explain the unique maximum and minimum for each voltage? If it will do both voltages, one maximum and one minimum would be the norm. Some minimum less than 2.5V and some maximum greater than 3.3V.
How could the same part have a maximum of 2.75V and a minimum of 3.0V?
Probably just means these are the voltages the die is tested at in manufacture, they don't guarantee
its upto spec outside the measured ranges. Is a little bit odd though, I would have thought they
just need to give the whole range, simpler and less confusing and I don't see how it could fail to
operate at different voltages.