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Part Number: LSF0108
when i use the LSF0108 to complete the level conversion,i found that choose the pull up resistor is difficult,because,according the equation of the datasheet,the pull up risistor =(Vpu-0.35v)/0.015A,
for the equation ,i must know the current first,but a lot of dataheet don't given this parameter,so, i can't dicide the value of the pull up resistor.
on my schematic,please see the following diagram,at the sign 1,there is a 10k pull up resistor at the other page,and the side A(pin8),there is a 1k pull up resistor,is OK?
at the sign 2,there is a 10k pull up resistor at the other page,and the other sideA(pin9),there is a 10k pull up too,is right?
and other pins,the side B are 1.24k pull up,and side A are 1k,is OK ?
the same chip and the different channels the pull up resistor is different,is OK?
please check it for me ,thanks.
We have a video series that talks about this that I think might help you. The video on up-translation has the equations I use for selecting pull-up resistors at about the 4:32 mark
I would recommend watching the whole series though - it isn't that long, and gives a ton of useful information for designing with the LSF family of translators.
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In reply to Emrys Maier:
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