mpc8270vr Freescale Semiconductor, Inc, mpc8270vr Datasheet - Page 14
mpc8270vr
Manufacturer Part Number
mpc8270vr
Description
Mpc8275 Powerquicc Ii Integrated Communications Processor
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MPC8270VR.pdf
(80 pages)
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AC Electrical Characteristics
6 AC Electrical Characteristics
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 for MAX Delay and 10-pf load for
MIN delay. Typical output buffer impedances are shown in
14
1
2
1
2
3
60x bus
Local bus
Memory controller
Parallel I/O
PCI
On all other revisions, impedance value is selected through the SIUMCR[20,21]. Refer to the MPC8280
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)
These are typical values at 65° C. Impedance may vary by ±25% with process and temperature.
On silicon revision 0.0 (mask #: 0K49M), selectable impedance is not available. Impedance is set at 45 Ω.
Test temperature = 105
P
Values do not include I/O. Add the following estimates for active I/O based on the following bus speeds:
INT
(MHz)
66.67
66.67
66.67
66.67
83.33
83.33
83.33
Bus
100
100
= I
DD
x V
DD
Multiplication
Table 7. Estimated Power Dissipation for Various Configurations
Watts
Output Buffers
Factor
MPC8280 PowerQUICC™ II Family Hardware Specifications, Rev. 1.8
CPM
2.5
2.5
3.5
3.5
3
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
Table
8.
(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
INT
Freescale Semiconductor
1
(W)
2, 3
Maximum
1.05
1.15
1.35
1.55
1.65
1.0
1.1
1.4
1.6