82801DB Datasheet, PDF (534/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Electrical Characteristics
Table 17-13. Universal Serial Bus Timing
Sym
Parameter
Min Max
Full Speed Source ⁽⁷⁾
t100 USBPx+, USBPx- Driver Rise Time
4
20
t101 USBPx+, USBPx- Driver Fall Time
4
20
Source Differential Driver Jitter
t102 To Next Transition
For Paired Transitions
–3.5 3.5
–4
4
t103 Source SE0 interval of EOP
160 175
t104
Source Jitter for Differential Transition to SE0
Transition
–2
5
Receiver Data Jitter Tolerance
t105 To Next Transition
For Paired Transitions
–18.5 18.5
–9
9
t106 EOP Width: Must accept as EOP
82
t107
Width of SE0 interval during differential
transition
14
Low Speed Source ⁽⁸⁾
t108 USBPx+, USBPx- Driver Rise Time
75
300
t109 USBPx+, USBPx- Driver Fall Time
75
300
Source Differential Driver Jitter
t110 To Next Transition
For Paired Transitions
–25
25
–14
14
t111 Source SE0 interval of EOP
1.25 1.50
t112
Source Jitter for Differential Transition to SE0
Transition
–40
100
Receiver Data Jitter Tolerance
t113 To Next Transition
For Paired Transitions
–152 152
–200 200
t114 EOP Width: Must accept as EOP
670
t115
Width of SE0 interval during differential
transition
210
Units
Notes
Fig
ns 1, CL = 50 pF 17-13
ns 1, CL = 50 pF 17-13
ns 2, 3
ns
ns 4
ns 5
17-14
17-15
ns 3
ns
ns 4
ns
17-14
17-15
1, 6
ns CL = 50 pF
17-13
CL = 350 pF
1,6
ns CL = 50 pF
17-13
CL = 350 pF
ns 2, 3
ns
µs 4
ns 5
17-14
17-15
ns 3
ns
ns 4
ns
17-14
17-15
NOTES:
1. Driver output resistance under steady state drive is specified at 28 Ω at minimum and 43 Ω 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
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Intel^® 82801DB ICH4 Datasheet