MC68HC908BD48 Datasheet, PDF (278/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
21.11 USB Low Speed Source Electrical Characteristics
Characteristic
Symbol
Conditions
(Notes 1,2,3)
Min
Transition time:
Rise Time
Fall Time
Rise/Fall Time Matching
Output Signal Crossover Voltage
Low Speed Data Rate
T_R
T_F
T_RFM
V_CRS
T_DRATE
Notes 4, 5, 8
C_L= 50pF
C_L = 350pF
C_L = 50pF
C_L = 350pF
T_R/T_F
1.5 Mbs ± 1.5%
75
75
80
1.3
1.4775
676.8
Source Differential Driver Jitter
To Next Transition
For Paired Transitions
T_UDJ1
T_UDJ2
C_L = 350pF
Notes 6, 7
– 25
– 10
Receiver Data Jitter Tolerance
To Next Transition
For Paired Transitions
T_DJR1
T_DJR2
C_L = 350pF
Note 7
– 75
– 45
Source EOP Width
TEOPT
Note 7
1.25
Differential to EOP Transition
Skew
TDEOP
Note 7
– 40
Receiver EOP Width
Must Reject as EOP
Must Accept
T_EOPR1
Note 7
330
T_EOPR2
675
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.
Typ
—
—
—
—
1.500
666.0
—
—
—
—
—
—
—
—
21.12 Timer Interface Module Characteristics
Characteristic
Input Capture Pulse Width
Input Clock Pulse Width
Symbol
t_TIH, t_TIL
t_TCH, t_TCL
Min
125
(1/f_OP) + 5
Max
Unit
—
300
ns
—
300
120
%
2.0
V
1.5225 Mbs
656.8
ns
25
ns
10
ns
75
ns
45
ns
1.50
µs
100
ns
—
ns
—
ns
Max
Unit
—
ns
—
ns
Technical Data
278
Electrical Specifications
MC68HC908BD48 — Rev. 1.0
MOTOROLA