MC68HC908JW32_09 Datasheet, PDF (215/232 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Crystal Oscillator Characteristics
19.8 Crystal Oscillator Characteristics
Table 19-7. Oscillator Characteristics
Characteristic
Symbol
Min
Crystal frequency⁽¹⁾
f_XCLK
1
External clock
Reference frequency^{(1), (2)}
f_XCLK
dc
Crystal load capacitance⁽³⁾
C_L
—
Crystal fixed capacitance⁽³⁾
C₁
—
Crystal tuning capacitance⁽³⁾
C₂
—
Feedback bias resistor
R_B
—
Series resistor^{(3), (4)}
R_S
—
1. The USB module is designed to function at f_XCLK = 4MHz.
2. No more than 10% duty cycle deviation from 50%.
3. Consult crystal vendor data sheet.
4. Not required for high-frequency crystals.
Typ
4
—
—
2 × C_L
2 × C_L
1
—
Max
4
4
—
—
—
—
—
Unit
MHz
MHz
pF
pF
pF
MΩ
Ω
19.9 USB DC Electrical Characteristic
The USB electrical performance is compliant to the USB specification 2.0.
Table 19-8. USB DC Electrical Characteristics
Characteristic⁽¹⁾
Symbol
Conditions
Min
Hi-Z state data line leakage
I_LO
0 V < V_IN < 3.3 V
–10
Voltage input high (driven)
V_IH
2.0
Voltage input high (floating)
V_IHZ
2.7
Voltage input low
V_IL
Differential input sensitivity
V_DI
|(D+) – (D–)|
0.2
Differential common mode range
V_CM
Includes V_DI
0.8
Range
Static output low
V_OL
R_L of 1.425 K
to 3.6 V
Static output high
V_OH
R_L of 14.25 K
2.8
to GND
Output signal crossover voltage
V_CRS
1.3
Regulator bypass capacitor
C_REGBYPASS
Regulator bulk capacitor
C_REGBULK
4.7
1. V_DD = 3.9 to 5.5 Vdc, V_SS = 0 Vdc, T_A = T_L to T_H, unless otherwise noted.
Typ
—
0.47
Max
Unit
+10
µA
V
3.6
V
0.8
V
V
2.5
V
0.3
V
3.6
V
2.0
V
µF
µF
MC68HC908JW32 Data Sheet, Rev. 6
Freescale Semiconductor
215