MPC8270 MOTOROLA [Motorola, Inc], MPC8270 Datasheet - Page 14

• Manufacturer Part Number: MPC8270
• Description: PowerQUICC II Family Hardware Specifications
• Manufacturer: MOTOROLA [Motorola, Inc]

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2
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Table 7 provides preliminary, estimated power dissipation for various configurations. Note that suitable
thermal management is required to ensure the junction temperature does not exceed the maximum specified
value. Also note that the I/O power should be included when determining whether to use a heat sink. For a
complete list of possible clock configurations, refer to Section 7, “Clock Configuration Modes.”
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The following sections include illustrations and tables of clock diagrams, signals, and CPM outputs and
inputs for 66.67/83.33/100 MHz devices. Note that AC timings are based on a 50-pf load. Typical output
buffer impedances are shown in Table 8.
60x bus
Local bus
Memory controller
Parallel I/O
PCI
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These are typical values at 65˚ C. Impedance may vary by ±25% with process and temperature.
Test temperature = 105
On silicon revision 0.0 (mask #: 0K49M), selectable impedance is not available. Impedance is set at 45 Ω.
P
Values do not include I/O. Add the following estimates for active I/O based on the following bus speeds:
On all other revisions, impedance value is selected through the SIUMCR[20,21]. Refer to the MPC8280 Addendum to
the MPC8260 PowerQUICC II Family Reference Manual.
66.7 MHz = 0.45 W (nominal), 0.5 W (maximum)
83.3 MHz = 0.5W (nominal), 0.6 W (maximum)
100 MHz = 0.6 W (nominal), 0.7 W (maximum)
INT
(MHz)
66.67
66.67
66.67
66.67
83.33
83.33
83.33
Bus
100
100
= I
DD
Power Dissipation
AC Electrical Characteristics
x V
DD
Multiplication
Watts
Table 7. Estimated Power Dissipation for Various Configurations
Output Buffers
Factor
CPM
2.5
2.5
3.5
3.5
MPC8280 PowerQUICC II™ Family Hardware Specifications
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3
3
3
3
˚
C
Table 8. Output Buffer Impedances
(MHz)
CPM
166
166
200
233
250
250
292
300
300
Multiplication
Factor
CPU
3.5
4.5
4.5
4.5
4
4
4
5
4
(MHz)
CPU
233
266
266
300
333
375
417
400
450
Typical Impedance (Ω)
1
45 or 27
45 or 27
45
45
27
Nominal
0.95
1.05
1.05
1.25
1.45
1.55
1.0
1.3
1.5
2
2
Vddl 1.5 Volts
P
1
INT
(W)
2,3
MOTOROLA
Maximum
1.05
1.15
1.35
1.55
1.65
1.0
1.1
1.4
1.6