Datasheet

920
32142D–06/2013
ATUC64/128/256L3/4U
35.9.9.2 Strong Pull-up Pull-down
35.9.10 USB Transceiver Characteristics
The USB on-chip buffers comply with the Universal Serial Bus (USB) v2.0 standard. All AC
parameters related to these buffers can be found within the USB 2.0 electrical specifications.
35.9.10.1 Electrical Characteristics
Table 35-37. Strong Pull-up Pull-down
Parameter Min Typ Max Unit
Pull-down resistor 1
kOhm
Pull-up resistor 1
Table 35-38. Electrical Parameters
Symbol Parameter Conditions Min Typ Max Unit
R
EXT
Recommended external USB
series resistor
In series with each USB pin with
±5%
39 Ohm