Electrical Characteristics
16-12
Intel
82801BA ICH2 Datasheet
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
Table 16-12. Universal Serial Bus Timing
Sym
Parameter
Min
Max
Units
Notes
Fig
Full Speed Source (Note 7)
t100
USBPx+, USBPx- Driver Rise Time
4
20
ns
1, CL = 50 pF
1, CL = 50 pF
16-14
t101
USBPx+, USBPx- Driver Fall Time
4
20
ns
16-14
t102
Source Differential Driver Jitter
To Next Transition
For Paired Transitions
-2
-1
2
1
ns
ns
2, 3
16-15
t103
Source EOP Width
160
175
ns
4
16-16
t104
Differential to SE0 Transition Skew
-2
5
ns
5
t105
Receiver Data Jitter Tolerance
To Next Transition
For Paired Transitions
-20
-10
20
10
ns
ns
3
16-15
t106
EOP Width: Must reject as EOP
EOP Width: Must accept as EOP
40
85
ns
ns
4
16-16
t107
Differential to SE0 Transition Skew
-2
5
ns
5
Low Speed Source (Note 8)
t108
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
16-14
t109
USBPx+, USBPx- Driver Fall Time
75
300
ns
ns
16-14
t110
Source Differential Driver Jitter
To Next Transition
For Paired Transitions
-2
-1
2
1
ns
ns
2, 3
16-15
t111
Source EOP Width
160
175
ns
4
16-16
t112
Differential to SE0 Transition Skew
-2
5
ns
5
t113
Receiver Data Jitter Tolerance
To Next Transition
For Paired Transitions
-20
-10
20
10
ns
ns
3
16-15
t114
EOP Width: Must reject as EOP
EOP Width: Must accept as EOP
40
85
ns
ns
4
16-16
t115
Differential to SE0 Transition Skew
-2
5
ns
5
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