Develop an end-to-end hypothetical reference model, network architectures, precision time tools, performance objectives and the methods to distribute, operate, monitor time synchronization within data center and much more...
MIT License
1.32k
stars
101
forks
source link
Connecting 1PPS and 10MHz outputs with 50 Ohm termination to another TimeCard 1PPS and 10MHz inputs #105
Seems that the 3.3V bidirectional drivers connected to the SMA connectors of one TimeCard in output mode can not be connected to another TimeCard input with 50 Ohm termination since 0.53.3V is lower then Input HIGH (0.653.3V) level specified for nc7wv125-d.
I may oversee something but a signal generator with a configuration of 3.3V square wave signal will generate 3.3V pulses with the termination resistor connected while the TimeCard output will be only half of that.
Seems that the 3.3V bidirectional drivers connected to the SMA connectors of one TimeCard in output mode can not be connected to another TimeCard input with 50 Ohm termination since 0.53.3V is lower then Input HIGH (0.653.3V) level specified for nc7wv125-d.
I may oversee something but a signal generator with a configuration of 3.3V square wave signal will generate 3.3V pulses with the termination resistor connected while the TimeCard output will be only half of that.
Is this intended?
[1] https://github.com/opencomputeproject/Time-Appliance-Project/blob/master/Time-Card/HW/ECAD/Latest/TimeCardV9_Schematic_8-28-2023.pdf [2] https://www.onsemi.com/download/data-sheet/pdf/nc7wv125-d.pdf