Hub Repeater Electrical Characteristics - Freescale Semiconductor MC68HC08KH12 Datasheet

17.12 HUB Repeater Electrical Characteristics

Low Speed HUB Electrical Characteristics
Characteristic
HUB Differential Data Delay
HUB Differential Driver Jitter
(including cable)
Downstream:
To Next Transition
For Paired Transitions
Upstream
To Next Transition
For Paired Transitions
Data bit width distortion after EOP.
HUB EOP Delay Relative to T
HUB EOP Output Width Skew
Full Speed HUB Electrical Characteristics
Characteristic
HUB Differential Data Delay
(with cable)
(without cable)
HUB Differential Driver Jitter
(including cable)
To Next Transition
For Paired Transitions
Data bit width distortion after SOP.
HUB EOP Delay Relative to T
HUB EOP Output Width Skew
NOTES:
1. All voltages measured from local ground, unless otherwise specified.
2. All timings use a capacitive load of (CL) to ground of 50pF, unless otherwise specified.
3. Full speed timings have a 1.5kΩ pull-up to 2.8V on the D+ data line.
4. Low speed timings have a 1.5kΩ pull-up to 2.8V on the D– data line.
5. Measured from 10% to 90% of the data signal.
6. The rising and falling edges should be smoothly transitioning (monotonic).
7. Timing differences between the differential data signals.
8. Measured at crossover point of differential data signals.
9. The maximum load specification is the maximum effective capacitive load allowed that meets the target HUB VBUS droop of 330mV.
MC68HC(7)08KH12 Rev. 1.1
—
Freescale Semiconductor
Symbol
TLHDD
T
LDHJ1
T
LDHJ2
T
LUHJ1
T
LUHJ2
TSOP
TLEOPD
HDD
TLHESK
Symbol
T
HDD1
T
HDD1
T
HDJ1
T
HDJ2
T
SOP
T
HDD EOPD
T
HESK
(Root port and downstream ports configured as low speed)
Conditions
Min
(Notes 1,2,3)
Note 4, 7, 8
–45
Note 4, 7, 8 –15
45
45
Note 4,8 –60
Note 4,8 0
Note 4,8 –300
(Root port and downstream ports configured as full speed)
Conditions
Min
(Notes 1,2,3)
Note 3, 7, 8
Note 3, 7, 8
–3
–1
Note 3, 8 –5
Note 3, 8 0
Note 3, 8 –15
Typ Max Unit
300
45
15
45
45
60
200
300
Typ Max Unit
70
40
3
1
5
15
15
Advance Information
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
255