mpc8250 Freescale Semiconductor, Inc, mpc8250 Datasheet - Page 12

• Manufacturer Part Number: mpc8250
• Description: Mpc8250 Powerquicc Ii Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

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