MPC8260EC datasheet(12/41 Pages) FREESCALE

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MPC8260 PowerQUICC II Integrated Communications Processor 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 MPC8260 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.

NOTE: Rise/Fall Time on CPM Input Pins

It is recommended that the rise/fall time on CPM input pins should not

exceed 5 ns. This should be enforced especially on clock signals. Rise time

refers to signal transitions from 10% to 90% of VCC; fall time refers to

transitions from 90% to 10% of VCC.

Table 6. Output Buffer Impedances1

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

Note:

Table 7. AC Characteristics for CPM Outputs1

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

sp36a

sp37a

FCC outputs—internal clock (NMSI)

sp36b

sp37b

FCC outputs—external clock (NMSI)

sp40

sp41

TDM outputs/SI

sp38a

sp39a

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

sp38b

sp39b

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

sp42

sp43

PIO/TIMER/IDMA outputs

Note:

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