θJA = Package thermal resistance, junction-to-ambient, °C/W
PD = Pint + PI/O
Pint = IDD × VDD, Watts - chip internal power
PI/O = Power dissipation on input and output pins - user determined
For most applications, PI/O << Pint and can be neglected. An approximate relationship
between PD and TJ (if PI/O is neglected) is:
PD = K ÷ (TJ + 273 °C)
Solving the equations above for K gives:
K = PD × (TA + 273 °C) + θJA × (PD)2
where K is a constant pertaining to the particular part. K can be determined by measuring
PD (at equilibrium) for an known TA. Using this value of K, the values of PD and TJ can
be obtained by solving the above equations iteratively for any value of TA.
6 Peripheral operating requirements and behaviors
6.1 External oscillator (XOSC) and ICS characteristics
Table 9. XOSC and ICS specifications (temperature range = -40 to 105 °C ambient)
Num
C
Characteristic
Symbol
Min
Max
Unit
1
C
Oscillator
crystal or
resonator
Low range (RANGE = 0)
flo
32
—
40
kHz
C
High range (RANGE = 1)
fhi
4
—
20
MHz
C
High range (RANGE = 1),
high gain (HGO = 1),
FBELP mode
fhi
4
—
20
MHz
C
High range (RANGE = 1),
low power (HGO = 0),
FBELP mode
fhi
4
—
20
MHz
2
D
Load capacitors
C1, C2
Table continues on the next page...
Peripheral operating requirements and behaviors
MC9S08PT60 Series Data Sheet, Rev. 3, 4/2012.
18
Freescale Semiconductor, Inc.