MC68HC908LD64 Datasheet, PDF (350/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
24.12.1 USB Low Speed Source Electrical Characteristics
Table 24-11. USB Low Speed Source Electrical Characteristics
Characteristic
Symbol Conditions⁽¹⁾
Min
Typ
Max Unit
Internal operating frequency
Transition time⁽²⁾
Rise time
Fall time
Rise/Fall time matching
Output signal crossover voltage
Low speed data rate
f_OP
6
MHz
T_R
T_F
T_RFM
V_CRS
T_DRATE
C_L=200pF
C_L=600pF
C_L=200pF
C_L=600pF
T_R/T_F
1.5Mbs ± 1.5%
75
75
80
1.3
1.4775
676.8
—
—
—
1.500
666.0
ns
300
ns
ns
300
ns
120
%
2.0
V
1.5225 Mbs
656.8 ns
Source differential driver jitter
To next transition
For paired transitions
T_UDJ1
C_L=350pF
–25
T_UDJ2
Note ^{(3), (4)}
–10
25
ns
10
ns
Receiver data jitter tolerance
To next transition
For paired transitions
Source EOP width
T_DJR1
T_DJR2
TEOPT
C_L=350pF
Notes ^{(3), (4)}
Note ⁽⁴⁾
–75
–45
1.25
75
ns
45
ns
1.50
µs
Differential to EOP transition skew TDEOP
Note ⁽⁴⁾
–40
100
ns
Receiver EOP width
Must reject as EOP
Must accept
T_EOPR1
T_EOPR2
Note ⁽⁴⁾
330
675
ns
ns
Notes:
1. All voltages measured from local ground, unless otherwise specified. All timings use a capacitive load of 50pF, unless
otherwise specified. Low speed timings have a 1.5kΩ pull-up to 2.8V on the D– data line.
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.
3. Timing differences between the differential data signals.
4. Measured at crossover point of differential data signals.
Data Sheet
350
Electrical Specifications
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor