On 06/11/2021 09:11 AM, Marcus Müller wrote:
Hello Jim,
hm, that knowledge base article must be wrong: The octoclock internally only
has a 3.3V
supply. But before I say something wrong here, let me check back.
Best regards,
Marcus
The 1PPS outputs on the Octoclock are bufered by 7404 inverters, which
appear to have a 5V Vcc.
On 11.06.21 14:17, Jim Palladino wrote:
Hello,
We are planning on using an octoclock with several devices, including an N320.
The
octoclock outputs a 5V 1pps signal, but I'm confused about the N320 1pps input.
According to (https://kb.ettus.com/N320/N321):
"PPS - Pulse Per Second Using a PPS signal for timestamp synchronization
requires a
square wave signal with the following a 5Vpp amplitude."
If I look at the schematics for the N320, on page 15,
(https://kb.ettus.com/images/f/f4/USRP_N3XX_MB_Schematic.pdf) they show that
the input
1pps signal goes through an NC7SV157. Vcc for that is 3.3V in the schematics.
According to the datasheet, the absolute maximum rating on the input is 4.3V.
"https://www.onsemi.com/pdf/datasheet/nc7sv157-d.pdf";
So, I'm not sure how the N320 can safely accept a 5V input (from the octoclock
or other
device).
Thanks,
Jim
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