W81282F Datasheet, PDF (13/18 Pages) Winbond – USB Keyboard Controller with 4 Ports Hub

W81282F
PRELIMINARY
7. ELECTRICAL CHARACTERISTICS, continued
PARAMETER
Symbol
Conditions
Min Max Unit
Source Differential Driver Jitter to Next Transition t DJ1 Note 2, 3
-25 25 ns
/ to Paired Transition
/tDJ2
/-14 /14 ns
Differential to EOP transition Skew
Hub Differential Data Delay(without cable)
t _DEOP Note 3
t HDD2 Note 2,3,5
-40 100 ns
300 ns
Hub Differential Driver Jitter to Next Transition
/ to Paired Transition (including cable)
t HDJ1 Note 2,3,5
/
t
HDJ2
-45 45
ns
/ -45 /-45
Data bit width distortion after SOP
t SOP Note 3,5
-60 60 ns
Hub SE0 Delay Relative to t _HDD
Hub EOP Output Width Skew
t EOPD Note 3,5
t HESK Note 3,5
0
200 ns
-300 300 ns
Note 1: Measured from 10% to 90% of the data signal.
Note 2: Timing difference between the differential signals.
Note 3: Measured at crossover point of differential data signals.
Note 4: The rising and falling edges should be smoothly transiting(monotonic)
Note 5: Full Speed timing have a 1.5 kΩ pull-up to 2.8 V on the D+ (DP) data line.
Note 6: Low Speed timing have a 1.5 kΩ pull-up to 2.8 V on the D- (DM) data line.
Note 7: The maximum load specification is the maximum effective capacitive load allowed that meets
the target hub VBUS droop of 330 mV.
Note 8: All other USB Electrical Characteristics refer to USB spec Rev 1.1 7.3.2 and 7.3.3.
Publication Release Date: Aug. 1999
- 10 -
Revision 0.5