Electrical Specifications
USB DC Electrical Characteristics
MC68HC908LD64 — Rev. 3.0
Data Sheet
Freescale Semiconductor
Electrical Specifications
351
24.12.2 USB High Speed Source Electrical Characteristics
Table 24-12. USB High Speed Source Electrical Characteristics
Characteristic
Symbol
Conditions(1)
Notes:
1. All voltages measured from local ground, unless otherwise specified. All timings use a capacitive load of 50pF, unless
otherwise specified. High speed timings have a 1.5k
pull-up to 2.8V on the D+ data line.
Min
Typ
Max
Unit
Internal operating frequency
fOP
6MHz
Transition time(2)
Rise time
Fall time
2. Transitions are measured from 10% to 90% of the data signal. The rising and falling edges should be smoothly transitioning
(monotonic). Capacitive loading includes 50pF of tester capacitance.
TR
TF
CL=50pF
4
20
ns
Rise/Fall time matching
TRFM
TR/TF
90
110
%
Output signal crossover voltage
VCRS
1.3
2.0
V
High speed data rate
TDRATE
12Mbs
± 0.25%
11.97
12.03
Mbs
Frame interval
TFRAME
1.0ms
± 0.05%
0.9995
1.0005
ms
Source differential driver jitter
To next transition
For paired transitions
TDJ1
CL=50pF
Notes (3), (4)
3. Timing differences between the differential data signals.
4. Measured at crossover point of differential data signals.
–3.5
–4.0
3.5
4.0
ns
Source EOP Width
TEOPT
Note (4)
160
175
ns
Differential to EOP transition skew
TDEOP
Note (4)
–2
5
ns
Receive data jitter tolerance
To next transition
For paired transitions
TJR1
TJR2
CL=50pF
Notes (3), (4)
–18.5
–9
18.5
9
ns
Receiver EOP width
Must reject as EOP
Must accept
TEOPR1
TEOPR2
Note (4)
40
82
ns