Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Data Sheet
Product codes
AT91SAM9X25-EK
1101
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
46.12 USB Transceiver Characteristics
Figure 46-4. USB Data Signal Rise and Fall Times
Table 46-22. USB Transceiver Electrical Parameters
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Input Levels
V
IL
Low Level
0.8
V
V
IH
High Level
2.0
V
V
DI
Differential Input Sensitivity
|(D+) - (D-)|
0.2
V
V
CM
Differential Input Common Mode
Range
Range
0.8
2.5
V
C
IN
Transceiver capacitance
Capacitance to ground on each line
9.18
pF
I
lkg
Hi-Z State Data Line Leakage
0V < V
IN
< 3.3V
- 10
+ 10
µA
R
EXT
Recommended External USB Series
Resistor
Resistor
In series with each USB pin with ±5%
27
Ω
Output Levels
V
OL
Low Level Output
Measured with R
L
of 1.425 k
Ω tied to 3.6V
0.0
0.3
V
V
OH
High Level Output
Measured with R
L
of 14.25 k
Ω tied to GND
2.8
3.6
V
V
CRS
Output Signal Crossover Voltage
1.3
2.0
V
Pull-up and Pull-down Resistor
R
PUI
Bus Pull-up Resistor on Upstream
Port (idle bus)
Port (idle bus)
0.900
1.575
k
Ω
R
PUA
Bus Pull-up Resistor on Upstream
Port (upstream port receiving)
Port (upstream port receiving)
1.425
3.090
k
Ω
R
PD
Bus Pull-down resistor
14.25
24.8
k
Ω
10%
10%
90%
V
CRS
t
R
t
F
Differential
Data Lines
Data Lines
Rise Time
Fall Time
f
osc
= 6 MHz/750 kHz
R
EXT
= 27 ohms
C
load
Buffer
(b)
(a)
Table 46-23. In Full Speed
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
t
FR
Transition Rise Time
C
LOAD
= 50 pF
4
20
ns
t
FE
Transition Fall Time
C
LOAD
= 50 pF
4
20
ns
t
FRFM
Rise/Fall time Matching
90
111.11
%