MPC8250 View Datasheet(PDF) - Freescale Semiconductor
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MPC8250 Datasheet PDF : 62 Pages
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Electrical and Thermal Characteristics
2.4 AC Electrical Characteristics
The following sections include illustrations and tables of clock diagrams, signals, and CPM outputs and
inputs for the 66 MHz MPC8250 device. Note that AC timings are based on a 50-pf load. Typical output
buffer impedances are shown in Table 6.
Table 6. Output Buffer Impedances 1
Output Buffers
Typical Impedance (Ω)
60x bus
40
Local bus
40
Memory controller
40
Parallel I/O
46
PCI
25
1 These are typical values at 65° C. The impedance may vary by
±25% with process and temperature.
Table 7 lists CPM output characteristics.
Table 7. AC Characteristics for CPM Outputs 1
Spec Number
Max
Min
Characteristic
Max Delay (ns) Min Delay (ns)
66 MHz 83 MHz 66 MHz 83 MHz
sp36a
sp37a FCC outputs—internal clock (NMSI)
6
5.5
1
1
sp36b
sp37b FCC outputs—external clock (NMSI)
14
12
2
1
sp40
sp41 TDM outputs/SI
25
16
5
4
sp38a
sp39a SCC/SMC/SPI/I2C outputs—internal clock (NMSI)
19
16
1
0.5
sp38b
sp39b Ex_SCC/SMC/SPI/I2C outputs—external clock (NMSI)
19
16
2
1
sp42
sp43 TIMER/IDMA outputs
14
11
1
0.5
sp42a
sp43a PIO outputs
14
11
0.5
0.5
1 Output specifications are measured from the 50% level of the rising edge of CLKIN to the 50% level of the signal.
Timings are measured at the pin.
Table 8 lists CPM input characteristics.
Table 8. AC Characteristics for CPM Inputs 1
Spec Number
Max
Min
Characteristic
sp16a
sp16b
sp17a FCC inputs—internal clock (NMSI)
sp17b FCC inputs—external clock (NMSI)
Setup (ns)
Hold (ns)
66 MHz 83 MHz 66 MHz 83 MHz
10
8
0
0
3
2.5
3
2
MPC8250 Hardware Specifications, Rev. 2
12
Freescale Semiconductor
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