Intel
82801E C-ICH
Advance Information Datasheet
67
Table 48. Universal Serial Bus Timing
Sym
Parameter
Min
Max
Units
Notes
Fig
Full Speed Source (Note 7)
t122
USBPx+, USBPx- Driver Rise Time
4
20
ns
1, CL = 50 pF
1, CL = 50 pF
21
t123
USBPx+, USBPx- Driver Fall Time
4
20
ns
21
t102
Source Differential Driver Jitter
To Next Transition
For Paired Transitions
-3.5
-4
3.5
4
ns
ns
2, 3
22
t103
Source SE0 interval of EOP
160
175
ns
4
23
t104
Source Jitter for Differential Transition to
SE0 Transition
-2
5
ns
5
t105
Receiver Data Jitter Tolerance
To Next Transition
For Paired Transitions
-18.5
-9
18.5
9
ns
ns
3
22
t106
EOP Width: Must accept as EOP
82
ns
4
23
t107
Width of SE0 interval during differential
transition
14
ns
Low Speed Source (Note 8)
t122
USBPx+, USBPx- Driver Rise Time
75
300
ns
ns
1, 6
CL = 50 pF
CL = 350 pF
1,6
CL = 50 pF
CL = 350 pF
21
t123
USBPx+, USBPx- Driver Fall Time
75
300
ns
ns
21
t110
Source Differential Driver Jitter
To Next Transition
For Paired Transitions
-25
-14
25
14
ns
ns
2, 3
22
t111
Source SE0 interval of EOP
1.25
1.50
μs
4
23
t112
Source Jitter for Differential Transition to
SE0 Transition
-40
100
ns
5
t113
Receiver Data Jitter Tolerance
To Next Transition
For Paired Transitions
-152
-200
152
200
ns
ns
3
22
t114
EOP Width: Must accept as EOP
670
ns
4
23
t115
Width of SE0 Interval during Differential
Transition
210
ns
5
NOTES:
1. Driver output resistance under steady state drive is specified at 28 ohms at minimum and 43 ohms at
maximum
2. Timing difference between the differential data signals
3. Measured at crossover point of differential data signals
4. Measured at 50% swing point of data signals
5. Measured from last crossover point to 50% swing point of data line at leading edge of EOP
6. Measured from 10% to 90% of the data signal
7. Full Speed Data Rate has minimum of 11.97 Mbps and maximum of 12.03 Mbps
8. Low Speed Data Rate has a minimum of 1.48 Mbps and a maximum of 1.52 Mbps