LMK01801-Clock buffer single ended clk out termination clarification

Hi,

Is there any update on below querry.

Regards,

Rajesh.S

LVDS, CML, LVPECL are interfaces defined from the beginning for transmission line applications, so they have a well defined termination topology. LVCMOS is not like that. For many applications, a simple series resistor of 20-30 Ohm will be enough. For high speed applications, you can also add an AC termination. But to be exact, the only way to know what are the correct values to use, the answer is, to simulate the circuit.

Is the same as DDR type interfaces. You cannot give a generic answer, it depends on your topology, frequency/rise time, distance between devices, etc. For a point to point clock the topology is defined, but you may still want to simulate to choose the best terminations combination.

HI,

Thanks for the reply, In these case what should i do for the other pin (CLKout#) whether can i left float or i need to terminate.

Regards,

Rajesh.S

Excellent question. I understand from the datasheet that each LVCMOS pin is always active and equal to the other one, inverted. If I were you, I would put an AC termination on those pins. AC to eliminate static consumption... and termination to avoid noises on the board. If they are not necessary, you can always define them as DNF (do not fit) later on. Unless you find a way to make them inactive.