Datasheet

1130
SAM9G15 [DATASHEET]
11052D–ATARM–31-Oct-12
45.12 USB Transceiver Characteristics
45.12.1 Electrical Characteristics
Figure 45-2. USB Data Signal Rise and Fall Times
Table 45-22. 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
0.8 2.5 V
C
IN
Transceiver capacitance Capacitance to ground on each line 9.18 pF
I Hi-Z State Data Line Leakage 0V < V
IN
< 3.3V - 10 + 10 µA
R
EXT
Recommended External USB
Series 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 kΩ tied to
3.6V
0.0 0.3 V
V
OH
High Level Output
Measured with R
L
of 14.25 kΩ tied to
GND
2.8 3.6 V
V
CRS
Output Signal Crossover
Voltage
Measure conditions described in
Figure 45-2
1.3 2.0 V
Pull-up and Pull-down Resistor
R
PUI
Bus Pull-up Resistor on
Upstream Port (idle bus)
0.900 1.575 kOhm
R
PUA
Bus Pull-up Resistor on
Upstream Port (upstream port
receiving)
1.425 3.090 kOhm
R
PD
Bus Pull-down resistor 14.25 24.8 kOhm
10%
10%
90%
V
CRS
t
R
t
F
Differential
Data Lines
Rise Time Fall Time
Fosc = 6 MHz/750 kHz
R
EXT
=27 Ohms
C
load
Buffer
(b)
(a)
Table 45-23. 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 %