
USB timing
www.digi.com
75
USB full speed load
USB low speed load
C
L
= 50pf
R
S
usb_dp
C
L
= 50pf
R
S
usb_dm
Full Speed Buffer
Rs - external resistor
C
L
= 200pf to 600pf
R
S
usb_dp
R
S
usb_dm
Low Speed Buffer
Rs - external resistor
C
L
= 200pf to 600pf
VDD
1.5K
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