mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 564

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Appendix A Electrical Characteristics
A.1.7
This chapter describes the operating conditions of the device. Unless otherwise noted those conditions
apply to all the following data.
1
2
A.1.8
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
obtained from:
The total power dissipation can be calculated from:
564
I/O, Regulator and Analog Supply Voltage
Internal Logic Supply Voltage
PLL Supply Voltage
Voltage Difference VDDX to VDDA
Voltage Difference VSSX to VSSR and VSSA
Oscillator
Bus Frequency
Operating Junction Temperature Range
The device contains an internal voltage regulator to generate the logic and PLL supply out of the I/O supply. The given
operating range applies when this regulator is disabled and the device is powered from an external source.
Some blocks e.g. ATD (conversion) and NVMs (program/erase) require higher bus frequencies for proper operation.
T
T
T
P
P
P
J
J
A
D
JA
D
INT
=
=
=
=
=
=
T
Junction Temperature, [ C
Ambient Temperature, [ C
Total Chip Power Dissipation, [W]
=
P
A
Package Thermal Resistance, [ C/W]
INT
Operating Conditions
Power Dissipation and Thermal Characteristics
Chip Internal Power Dissipation, [W]
+
2
Instead of specifying ambient temperature all parameters are specified for
the more meaningful silicon junction temperature. For power dissipation
calculations refer to
Characteristics”.
P
+
D
1
P
IO
JA
Rating
1
Section A.1.8, “Power Dissipation and Thermal
Table A-4. Operating Conditions
MC9S12E256 Data Sheet, Rev. 1.08
NOTE
Symbol
V
V
DDPLL
V
VDDX
VSSX
f
f
T
DD5
osc
bus
DD
J
2.97
2.35
2.35
–0.1
–0.1
0.25
Min
–40
0.5
3.3/5
Typ
2.5
2.5
—
—
—
0
0
Freescale Semiconductor
Max
2.75
2.75
140
J
5.5
0.1
0.1
16
25
) in C can be
MHz
MHz
Unit
V
V
V
V
V
C