Freescale Semiconductor MC68HC08KH12 manual HUB Repeater Electrical Characteristics, 255

17.12 HUB Repeater Electrical Characteristics

Low Speed HUB Electrical Characteristics (Root port and downstream ports configured as low speed)

Characteristic	Symbol	Conditions	Min	Typ	Max	Unit
		(Notes 1,2,3)
HUB Differential Data Delay	TLHDD	Note 4, 7, 8			300	ns
HUB Differential Driver Jitter
(including cable)
Downstream:
To Next Transition	TLDHJ1		–45		45	ns
For Paired Transitions	TLDHJ2	Note 4, 7, 8	–15		15	ns
Upstream
To Next Transition	TLUHJ1		45		45	ns
For Paired Transitions	TLUHJ2		45		45	ns
Data bit width distortion after EOP.	TSOP	Note 4,8	–60		60	ns
HUB EOP Delay Relative to THDD	TLEOPD	Note 4,8	0		200	ns
HUB EOP Output Width Skew	TLHESK	Note 4,8	–300		300	ns

Full Speed HUB Electrical Characteristics (Root port and downstream ports configured as full speed)

Characteristic	Symbol	Conditions	Min	Typ	Max	Unit
		(Notes 1,2,3)
HUB Differential Data Delay
(with cable)	THDD1	Note 3, 7, 8			70	ns
(without cable)	THDD1				40	ns
HUB Differential Driver Jitter
(including cable)		Note 3, 7, 8
To Next Transition	THDJ1		–3		3	ns
For Paired Transitions	THDJ2		–1		1	ns
Data bit width distortion after SOP.	TSOP	Note 3, 8	–5		5	ns
HUB EOP Delay Relative to THDD	TEOPD	Note 3, 8	0		15	ns
HUB EOP Output Width Skew	THESK	Note 3, 8	–15		15	ns

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	Advance Information
Freescale Semiconductor	255