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What is the correct pcb track impedance for Micro CD card class 6 - 10

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What is the correct pcb track impedance for Micro SD card class 6 - 10

Hello all

I am just tracking a board which uses a micro SD card and I can't seem to find any spec for the required track impedance.
I will be supporting class 10 SD cards (10MByte/s)

Maybe someone has done this and knows the answer?

Best regards
X
 

Hi,for micro SD,it's only taking care of pull-up or pull-down resistor value for acquiring adequate rising and falling ramp.
 

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