Hi,
I have a general question that I have always struggled with. I want to calculate what I need for a power supply to supply enough current to operate, lets say a simple LVC buffer (see attached). From the datasheet (running at 25 degC). Lets also assume it is driving the same buffer:
Vcc = 3.3V, Icc=500uA, Iol=4mA, Ioh=-4mA, Iin=1uA
So the simplest way is to just do Pd=Vcc*Icc = 3.3*500uA= 1.65mW.
But I am guessing that you need to add in the Ioh and the Iin(l) values too? So if it is just 1 buffer, you get an additional:
= Vcc*ioh + Vcc*Iin(l) = 3.3*4mA + 3.3*1uA = 13.2mW and then add to the 1.65mW to get your final answer which = 14.8mW.
The input capacitance of the receiver is 4pF and lets say this toggles at 1Khz.
Can anyone help me with this?
https://docs.rs-online.com/adfa/A700000006908799.pdf
I have a general question that I have always struggled with. I want to calculate what I need for a power supply to supply enough current to operate, lets say a simple LVC buffer (see attached). From the datasheet (running at 25 degC). Lets also assume it is driving the same buffer:
Vcc = 3.3V, Icc=500uA, Iol=4mA, Ioh=-4mA, Iin=1uA
So the simplest way is to just do Pd=Vcc*Icc = 3.3*500uA= 1.65mW.
But I am guessing that you need to add in the Ioh and the Iin(l) values too? So if it is just 1 buffer, you get an additional:
= Vcc*ioh + Vcc*Iin(l) = 3.3*4mA + 3.3*1uA = 13.2mW and then add to the 1.65mW to get your final answer which = 14.8mW.
The input capacitance of the receiver is 4pF and lets say this toggles at 1Khz.
Can anyone help me with this?
https://docs.rs-online.com/adfa/A700000006908799.pdf
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