MPC8248 Freescale Semiconductor, Inc, MPC8248 Datasheet - Page 15

• Manufacturer Part Number: MPC8248
• Description: Mpc8248 Powerquicc Ii Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

6
The following sections include illustrations and tables of clock diagrams, signals, and CPM outputs and
inputs for 66.67-/83.33-/100-/133-MHz MPC8272 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
6.1
Table 9
Freescale Semiconductor
1
Spec Number
sp36a sp37a FCC outputs—internal clock (NMSI)
sp36b sp37b FCC outputs—external clock (NMSI)
sp38a sp39a SCC/SMC/SPI/I2C outputs—internal clock (NMSI)
sp38b sp39b SCC/SMC/SPI/I2C outputs—external clock (NMSI)
sp42a sp43a PIO outputs
sp40
sp42
Max
measured at the pin.
Output specifications are measured from the 50% level of the rising edge of CLKIN to the 50% level of the signal. Timings are
1
2
60x bus
Memory controller
Parallel I/O
PCI
Manual .
These are typical values at 65° C. Impedance may vary by ±25% with process and temperature.
Impedance value is selected through SIUMCR[20,21]. Refer to the MPC8280 PowerQUICC II Family Reference
AC Electrical Characteristics
lists CPM output characteristics.
sp41 TDM outputs/SI
sp43 TIMER/IDMA outputs
Min
CPM AC Characteristics
MPC8272 PowerQUICC II™ Family Hardware Specifications, Rev. 1.5
Output Buffers
Characteristic
Table 9. AC Characteristics for CPM Outputs
Table 8. Output Buffer Impedances
MHz
66
10
11
11
11
6
8
8
Maximum Delay
MHz
5.5
83
10
11
11
11
8
8
Typical Impedance (Ω)
1
MHz
100
5.5
10
11
11
11
8
8
1
45 or 27
45 or 27
MHz
133
Value (ns)
5.5
11
10
11
11
45
27
8
8
2
2
AC Electrical Characteristics
MHz
0.5
2.5
0.5
0.5
66
2
0
2
Minimum Delay
MHz
0.5
2.5
0.5
0.5
83
2
0
2
MHz
100
0.5
2.5
0.5
0.5
Table
0
2
2
MHz
133
0.5
2.5
0.5
0.5
8.
2
0
2
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