Electrical Characteristics
Table A-4. Operating Conditions
Oscillator
fosc
4
—
—
16
32
MHz
MHz
°C
Bus frequency
fbus
0.5
Temperature Option C
Operating junction temperature range
T
T
–40
–40
—
27
105
85
J
A
Operating ambient temperature range(1)
Temperature Option V
°C
°C
Operating junction temperature range
T
–40
–40
—
27
125
105
J
Operating ambient temperature range1
T
A
Temperature Option M
Operating junction temperature range
T
–40
–40
—
27
150
125
J
Operating ambient temperature range1
T
A
1. Please refer to Section A.1.8, “Power Dissipation and Thermal Characteristics” for more details about the relation between
ambient temperature TA and device junction temperature TJ.
NOTE
Operation is guaranteed when powering down until low voltage reset
assertion.
A.1.8
Power Dissipation and Thermal Characteristics
Power dissipation and thermal characteristics are closely related. The user must assure that the maximum
operating junction temperature is not exceeded. The average chip-junction temperature (T ) in °C can be
J
obtained from:
T
= T + (P • Θ
)
J
A
D
JA
T
T
P
= Junction Temperature, [°C]
= Ambient Temperature, [°C]
= Total Chip Power Dissipation, [W]
J
A
D
Θ
= Package Thermal Resistance, [°C/W]
JA
The total power dissipation can be calculated from:
P
= P
+ P
D
INT
IO
P
= Chip Internal Power Dissipation, [W]
2
INT
P
=
R
⋅ I
∑
IO
DSON IO
i
i
S12P-Family Reference Manual, Rev. 1.13
Freescale Semiconductor
505
FREESCALE [ Freescale ]
