Rev. 2.00, 09/03, page 673 of 690
V
CC
V
CCmin
t
UOSC
USB crystal
oscillator
State oscillation
Figure 25.52 Oscillation Settling Time when USB Crystal Oscillator Is Turned On
25.3.13
USB Transceiver Timing
Table 25.15 USB Transceiver Timing
(Conditions: V
CC
Q = V
CC
-RTC = V
CC
-USB = 3.0 to 3.6 V, V
CC
= V
CC
-PLL1 = V
CC
-PLL2 = 1.4 to
1.6 V, AV
CC
= 3.0 to 3.6 V, V
SS
Q = V
SS
= V
SS
-RTC = V
SS
-USB = V
SS
-PLL1 = V
SS
-PLL2 =
AV
S
= 0 V, T
a
= –20 to 75°C)
Item
Symbol
Min
Typ
Max
Unit
Measurement
Condition
Rising time
t
r
4
—
20
ns
C
L
= 50pF
Falling time
t
f
4
—
20
ns
C
L
= 50pF
Rising/falling time ratio
t
r
/ t
f
90
—
110
%
Output signal crossover
voltage
V
CRS
1.3
—
2.0
V
C
L
= 50pF
Note:
This transceiver complies with the full-speed specifications.
t
r
, t
f
90%
10%
Crossover voltage
DP
DM
Measured
element
Vcc-USB
DP
DM
Vcc
VSS
RS = 33
Ω
RL = 15k
Ω
RL = 15k
Ω
CL
CL
RL = 1.5k
Ω
RS = 33
Ω
1. t
r
and t
f
are judged by the time taken for the
transitions between 10% and 90% amplitude.
2. The electrostatic capacitance, C
L
, includes the
floating capacitance of the wiring connection
and the input capacitance of the probe.
Measurement circuit
Содержание SH7705
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