Clock Generation Module Characteristics; Cgm Operating Conditions; Cgm Component Information - Motorola MC68HC908AB32 Technical Data Manual

23.12 Clock Generation Module Characteristics

23.12.1 CGM Operating Conditions

Characteristic
Operating Voltage
Crystal Reference Frequency
Module Crystal Reference
Frequency
Range Nominal Multiplier
VCO Center-of-Range Frequency
(MHz)
VCO Operating Frequency (MHz)

23.12.2 CGM Component Information

Characteristic
Crystal load capacitance
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
Series resistor
Filter capacitor multiply factor
Filter capacitor
Bypass capacitor
MC68HC908AB32 Rev. 1.0
—
MOTOROLA
Symbol Min
V
4.5 V
DD
f
1
RCLK
f
—
XCLK
f
—
NOM
f
4.9152
VRS
f
4.9152
VCLK
Symbol Min
C
—
L
C
—
1
C
—
2
R
—
B
R
—
S
C
—
Fact
C C
—
F Fact
C
—
BYP
Electrical Specifications

Clock Generation Module Characteristics

Typ Max
— 5.5 V
— 8.4
4.9152 MHz —
4.9152 MHz —
— 32.0
— 32.0
Typ Max
— —
2 × C
—
L
2 × C
—
L
22MΩ —
330kΩ 1MΩ
0.0154 —
× (V
/f
—
DDA XCLK)
0.1 µF
—
Electrical Specifications
Comments
Same Frequency as
f
RCLK
4.5 to 5.5 V, V only
DD
4.5 to 5.5 V, V only
DD
Unit
Consult crystal
manufacturer's data
Consult crystal
manufacturer's data
Consult crystal
manufacturer's data
Not required
F/s V
See 9.5.3 External Filter
Capacitor Pin
(CGMXFC).
C must provide low
BYP
AC impedance from f =
/100 to 100 ×
f
XCLK
f , so series
VCLK
resistance must be
considered.
Technical Data
383