Electrical Characteristics
3.8
External Oscillator (XOSCVLP) Characteristics
Refer to Figure 11 and Figure 12 for crystal or resonator circuits.
Table 9. XOSCVLP and ICS Specifications (Temperature Range = –40 to 85°C Ambient)
Num
C
Characteristic
Symbol
Min.
Typical1 Max. Unit
Oscillator crystal or resonator (EREFS = 1, ERCLKEN = 1)
Low range (RANGE = 0)
High range (RANGE = 1), high gain (HGO = 1)
High range (RANGE = 1), low power (HGO = 0)
flo
fhi
fhi
32
1
1
—
—
—
38.4
16
8
kHz
MHz
MHz
1
C
Load capacitors
Low range (RANGE=0), low power (HGO=0)
Other oscillator settings
See Note2
See Note3
C1,C2
2
3
D
D
Feedback resistor
Low range, low power (RANGE=0, HGO=0)2
Low range, high gain (RANGE=0, HGO=1)
High range (RANGE=1, HGO=X)
—
—
—
—
10
1
—
—
—
RF
MΩ
kΩ
Series resistor —
Low range, low power (RANGE = 0, HGO = 0)2
—
—
—
—
100
0
—
—
—
Low range, high gain (RANGE = 0, HGO = 1)
High range, low power (RANGE = 1, HGO = 0)
High range, high gain (RANGE = 1, HGO = 1)
RS
4
D
≥ 8 MHz
4 MHz
1 MHz
—
—
—
0
0
0
0
10
20
Crystal start-up time 4
Low range, low power
Low range, high gain
High range, low power
High range, high gain
t
—
—
—
—
600
400
5
—
—
—
—
CSTL
5
6
C
D
ms
t
CSTH
15
Square wave input clock frequency (EREFS = 0, ERCLKEN = 1)
FEE mode
fextal
0.03125
0
—
—
20
20
MHz
MHz
FBE or FBELP mode
1
2
3
4
Data in Typical column was characterized at 3.0 V, 25°C or is typical recommended value.
Load capacitors (C1,C2), feedback resistor (RF) and series resistor (RS) are incorporated internally when RANGE = HGO = 0.
See crystal or resonator manufacturer’s recommendation.
Proper PC board layout procedures must be followed to achieve specifications.
MC9S08QE8 Series, Rev. 3
16
Preliminary
Freescale Semiconductor
Subject to Change Without Notice
FREESCALE [ Freescale ]
