MC68HC908LD64 Datasheet, PDF (352/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
24.12.3 HUB Repeater Electrical Characteristics
Table 24-13. HUB Repeater Electrical Characteristics
Low Speed HUB Electrical Characteristics (Root port and downstream ports configured as low speed)
Characteristic
Symbol
Conditions
Note^(1),(2),(3)
Min
Typ
Max Unit
HUB differential data delay
T_LHDD Note ^(4),(5),(6)
300
ns
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_HDD
HUB EOP output width skew
T_LDHJ1
T_LDHJ2
T_LUHJ1
T_LUHJ2
T_EOP
T_LEOPD
T_LHESK
Note ^(4),(5),(6)
Note ^(4),(6)
Note ^(4),(6)
Note ^(4),(6)
– 45
– 15
45
45
– 60
0
– 300
45
ns
15
ns
45
ns
45
ns
60
ns
200
ns
300
ns
Full Speed HUB Electrical Characteristics (Root port and downstream ports configured as full speed)
Characteristic
Symbol
Conditions
(Notes 1,2,3)
Min
Typ
Max Unit
HUB differential data delay
(with cable)
(without cable)
T_HDD1
T_HDD1
Note ^(3),(5),(6)
70
ns
40
ns
HUB differential driver jitter
(including cable)
To next transition
For paired transitions
Data bit width distortion after SOP
HUB EOP delay relative to T_HDD
HUB EOP output width skew
T_HDJ1
T_HDJ2
T_SOP
T_EOPD
T_HESK
Note ^(3),(5),(6)
Note ^(3),(6)
Note ^(3),(6)
Note ^(3),(6)
–3
–1
–5
0
– 15
3
ns
1
ns
5
ns
15
ns
15
ns
Notes:
1. All voltages measured from local ground, unless otherwise specified.
2. All timings use a capacitive load of (C_L) 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. Timing differences between the differential data signals.
6. Measured at crossover point of differential data signals.
Measured from 10% to 90% of the data signal.
The rising and falling edges should be smoothly transitioning (monotonic).
The maximum load specification is the maximum effective capacitive load allowed that meets the target HUB VBUS droop of 330mV.
Data Sheet
352
Electrical Specifications
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor