Datasheet 325
Electrical Characteristics
NOTES:
1. Driver output resistance under steady state drive is specified at 28 at minimum and 43
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.
Table 8-26. 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, C
L
= 50
pF
8-17
t101 USBPx+, USBPx- Driver Fall Time 4 20 ns
1, C
L
= 50
pF
8-17
t102
Source Differential Driver Jitter
- To Next Transition
- For Paired Transitions
–3.5
–4
3.5
4
ns
ns
2, 3 8-18
t103 Source SE0 interval of EOP 160 175 ns 4 8-19
t104
Source Jitter for Differential
Transition to SE0 Transition
–2 5 ns 5
t105
Receiver Data Jitter Tolerance
- T o Next Transition
- For Paired Transitions
–18.5
–9
18.5
9
ns
ns
3 8-18
t106 EOP Width: Must accept as EOP 82 — ns 4 8-19
t107
Width of SE0 interval during
differential transition
—14ns
Low-speed Source (Note 8)
t108 USBPx+, USBPx – Driver Rise Time 75 300 ns
1, 6
C
L
= 50 pF
C
L
= 350 pF
8-17
t109 USBPx+, USBPx – Driver Fall Time 75 300 ns
1,6
C
L
= 50 pF
C
L
= 350 pF
8-17
t110
Source Differential Driver Jitter
To Next Transition
For Paired Transitions
–25
–14
25
14
ns
ns
2, 3 8-18
t111 Source SE0 interval of EOP 1.25 1.50 µs 4 8-19
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 8-18
t114 EOP Width: Must accept as EOP 670 — ns 4 8-19
t115
Width of SE0 interval during
differential transition
— 210 ns
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