Freescale Semiconductor MC68HC08KH12 manual USB Low Speed Source Electrical Characteristics, 253

17.10 USB Low Speed Source Electrical Characteristics

Characteristic	Symbol	Conditions	Min	Typ	Max	Unit
		(Notes 1,2,3)
Transition time:		Notes 4, 5, 8
Rise Time	TR	CL= 200pF	75	—	—
		CL = 600pF			300	ns
Fall Time	TF	CL =200pF	75	—	—
		CL = 600pF			300
Rise/Fall Time Matching	TRFM	TR/TF	80	—	120	%
Output Signal Crossover	VCRS		1.3	—	2.0	V
Voltage
Low Speed Data Rate	TDRATE	1.5Mbs±1.5%	1.4775	1.500	1.5225	Mbs
			676.8	666.0	656.8	ns
Source Differential Driver Jitter		CL=350pF		—
To Next Transition	TUDJ1		–25		25	ns
		Notes 6, 7		—
For Paired Transitions	TUDJ2		–10		10	ns
Receiver Data Jitter Tolerance		CL =350pF
To Next Transition	TDJR1		–75	—	75	ns
		Note 7
For Paired Transitions	TDJR2		–45	—	45	ns
Source EOP Width	TEOPT	Note 7	1.25	—	1.50	∝s
Differential to EOP Transition	TDEOP	Note 7	–40	—	100	ns
Skew
Receiver EOP Width
Must Reject as EOP	TEOPR1	Note 7	330	—	—	ns
Must Accept	TEOPR2		670	—	—	ns

NOTES:

1.All voltages measured from local ground, unless otherwise specified.

2.All timings use a capacitive load of 50pF, unless otherwise specified.

3.Low speed timings have a 1.5kΩ pull-up to 2.8V on the D– data line.

4.Measured from 10% to 90% of the data signal.

5.The rising and falling edges should be smoothly transitioning (monotonic).

6.Timing differences between the differential data signals.

7.Measured at crossover point of differential data signals.

8.Capacitive loading includes 50pF of tester capacitance.

MC68HC(7)08KH12 — Rev. 1.1	Advance Information
Freescale Semiconductor	253