AU6254 Datasheet, PDF (23/30 Pages) List of Unclassifed Manufacturers – USB2.0 Hub Controller

5.5 Crystal Oscillator Circuit Setup for
Characterization
The following setup was used to measure the open loop voltage gain for crystal
oscillator circuits. The feedback resistor serves to bias the circuit at its quiescent
operating point and the AC coupling capacitor, Cs, is much larger than C1 and C2.
Figure 5.1 Crystal Oscillator Circuit Setup for Characterization
5.6 Bus Timing/Electrical Characteristics
Table 5.5 DC Electrical Characteristics
Input Levels for Low-/Full –speed:
SYMBOL
PARAMETER
V_IH
High (Driven)
V_IHZ
High (floating)
V_IL
Low
V_DI
Differential Input Sensitivity
V_CM
Differential Common Mode Range
LIMITS
MIN
MAX
2.0
2.7
3.6
0.8
0.2
0.8
2.5
Input Levels for High –speed:
SYMBOL
PARAMETER
V_HHSSQ
V_HSDSC
High-speed squelch detection threshold
(differential signal amplitude)
High speed disconnect detection threshold
(differential signal amplitude)
LIMITS
MIN
MAX
100
150
525
625
UNIT
V
V
V
V
V
UNIT
mV
mV
AU6254 USB2.0 Hub Controller V1.00W
Official Release_ Public
Page 23 of 30