USB97C100 Datasheet, PDF (54/64 Pages) SMSC Corporation – Multi-Endpoint USB Peripheral Controller

PARAMETER
Capacitance
Transceiver Capacitance
Terminals
Bus Pull-up Resistor on
Root Port
Bus Pull-down Resistor on
Downstream Port
SYMBOL
CIN
RPU
RPD
CONDITIONS
(NOTE 1, 2)
Pin to GND
(1.5 KΩ +/- 5%)
(15 KΩ +/- 5%)
MIN TYP
1.425
14.25
MAX
20
1.575
15.75
Note 1: All voltages are measured from the local ground potential, unless otherwise specified.
Note 2: All timing use a capacitive load (CL) to ground of 50pF, unless otherwise specified.
Note 3: This is relative to VUSBIN.
Note 4: This is dependent on block configuration set by software.
Note 5: When the internal ring oscillator and waiting for first setup packet.
UNIT
pF
kΩ
kΩ
USB AC PARAMETERS
Rise Time
C_L
Differential
Data Lines
10%
90%
CL
t_R
Fall Time
90%
10%
t_F
Full Speed: 4 to 20ns at C_L = 50pF
FIGURE 5 - DATA SIGNAL RISE AND FALL TIME
Driver End
of Cable
VSS
Round Trip
Cable Delay
80ns (max)
50% Point of
Initial Swing
Receiver
End of Cable
VSS
One Way
Cable
Delay
30ns
(max)
Data Line
Crossover
Point
T_PERIOD
Differential
Data Lines
FIGURE 6 - CABLE DELAY
Crossover
Points
SMSC DS – USB97C100
Consecutive
Transitions
N * TPERIOD + TxJR1
Paired
Transitions
N * TPERIOD + TxJR2
FIGURE 7 - DIFFERENTIAL DATA JITTER
Page 54
Rev. 01/03/2001