10.2 USB AC PARAMETERS
Rise Time
Fall Time
90%
90%
CL
Differential
Data Lines
10%
10%
CL
tR
tF
Full Speed: 4 to 20ns at C = 50pF
L
FIGURE 5 - DATA SIGNAL RISE AND FALL TIME
TPERIOD
Crossover
Points
Differential
Data Lines
Consecutive
Transitions
N * TPERIOD + TxJR1
Paired
Transitions
N * TPERIOD + TxJR2
FIGURE 6 - DIFFERENTIAL DATA JITTER
TPERIOD
Crossover
Point Extended
Crossover
Point
Differential
Data Lines
Diff. Data to
SE0 Skew
N * TPERIOD + TDEOP
Source EOP Width: TEOPT
Receiver EOP Width: TEOPR1, TEOPR2
FIGURE 7 - DIFFERENTIAL TO EOP TRANSITION SKEW AND EOP WIDTH
SMSC DS – USB97CFDC2-01
Page 21
Rev. 02-27-07
DATASHEET
SMSC [ SMSC CORPORATION ]
