MC68HC908MR8 Datasheet, PDF (347/372 Pages) Motorola, Inc – Microcontrollers

Electrical Specifications
Clock Generation Module Component Specifications
21.10 Clock Generation Module Component Specifications
Characteristic
Crystal load capacitance
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
Series resistor
Filter capacitor
Bypass capacitor
Symbol Min
Typ
Max
Notes
C_L
—
—
—
Consult crystal
manufacturing data
C₁
—
2 * C_L
—
Consult crystal
manufacturing data
C₂
—
2 * C_L
—
Consult crystal
manufacturing data
R_B
—
22 MΩ
—
R_S
0
330 kΩ
1 MΩ Not required
C_F
—
C_FACT*
(V_DDA/f_XCLK)
—
—
C_BYP
—
0.1 µF
C_BYP must provide low ac
impedance from
—
f = f_XCLK/100 to
100 * f_VCLK, so series
resistance must be
considered.
21.11 CGM Operating Conditions
Characteristic
Crystal reference frequency
Range nominal multiplier
VCO center-of-range frequency
VCO frequency multiplier
VCO center of range multiplier
VCO operating frequency
Symbol
f_XCLK
f_NOM
f_VRS
N
L
f_VCLK
Min
1 MHz
—
4.9152 MHz
1
1
f_VRSMIN
Typ
—
4.9152 MHz
—
—
—
—
Max
8 MHz
—
32.8 MHz
15
15
f_VRSMAX
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Electrical Specifications
Technical Data
347