15
USB Timing Speci cations
Timing Speci cations over recommended operating conditions.
Parameter Symbol Min. Max. Units Notes
D+/D- Transition rise time T
LR
75 ns C
L
= 200 pF (10% to 90%), see Figure 10
D+/D- Transition rise time T
LR
300 ns C
L
= 600 pF (10% to 90%), see Figure 10
D+/D- Transition fall time T
LF
75 ns C
L
= 200 pF (90% to 10%), see Figure 10
D+/D- Transition fall time T
LF
300 ns C
L
= 600 pF (90% to 10%), see Figure 10
Rise and Fall time matching T
LRFM
80 125 % T
R
/T
F
; C
L
= 200 pF; Excluding the rst transi-
tion from the Idle State
Wakeup delay from USB suspend
mode due to buttons push
T
WUPB
17 ms Delay from button push to USB operation
Only required if remote wakeup enabled
Wakeup delay from USB suspend
mode due to buttons push until
accurate navigation
T
WUPN
50 ms Delay from button push to navigation
operation
Only required if remote wakeup enabled
USB reset time T
reset
18.7
s
Data Rate t
LDRATE
1.4775 1.5225 Mb/s Average bit rate, 1.5 Mb/s +/- 1.5%
Receiver Jitter Tolerance t
DJR1
-75 75 ns To next transition, see Figure 13
Receiver Jitter Tolerance t
DJR2
-45 45 ns For paired transitions, see Figure 13
Di erential to EOP Transition Skew t
LDEOP
-40 100 ns See Figure 14
EOP Width at Receiver t
LEOPR
670 ns Accepts EOP, see Figure 14
Source EOP Width t
LEOPT
1.25 1.50
s
Width of SE0 interval during
Di erential Transition
t
LST
210 ns See Figure 11
Di erential Output Jitter t
UDJ1
-95 95 ns To next transition, see Figure 15
Di erential Output Jitter t
UDJ2
-150 150 For paired transitions, see Figure 15
Figure 10. Data Signal Rise and Fall Times
V
CRS
10% 10%
90% 90%
T
LR
Rise Time
T
LF
Fall Time
V
OL
V
OH
D +
D -