MPC8250 datasheet(12/62 Pages) FREESCALE

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MPC8250 Hardware Specifications, Rev. 2

Freescale Semiconductor

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 7 lists CPM output characteristics.

Table 8 lists CPM input characteristics.

Table 6. Output Buffer Impedances 1

These are typical values at 65° C. The impedance may vary by

±25% with process and temperature.

Output Buffers

Typical Impedance (

Ω)

60x bus

Local bus

Memory controller

Parallel I/O

PCI

Table 7. AC Characteristics for CPM Outputs 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.

Spec Number

Characteristic

Max Delay (ns)

Min Delay (ns)

Max

Min

66 MHz 83 MHz 66 MHz 83 MHz

sp36a

sp37a

FCC outputs—internal clock (NMSI)

5.5

sp36b

sp37b

FCC outputs—external clock (NMSI)

sp40

sp41

TDM outputs/SI

sp38a

sp39a

SCC/SMC/SPI/I2C outputs—internal clock (NMSI)

0.5

sp38b

sp39b

Ex_SCC/SMC/SPI/I2C outputs—external clock (NMSI)

sp42

sp43

TIMER/IDMA outputs

0.5

sp42a

sp43a

PIO outputs

0.5

Table 8. AC Characteristics for CPM Inputs 1

Spec Number

Characteristic

Setup (ns)

Hold (ns)

Max

Min

66 MHz 83 MHz 66 MHz 83 MHz

sp16a

sp17a

FCC inputs—internal clock (NMSI)

sp16b

sp17b

FCC inputs—external clock (NMSI)

2.5

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