MPC8280CVRT datasheet(15/80 Pages) FREESCALE

15 / 80 page

MPC8280 PowerQUICC II™ Family Hardware Specifications, Rev. 1.7

Freescale Semiconductor

AC Electrical Characteristics

6.1 CPM AC Characteristics

Table 9 lists CPM output characteristics.

Table 10 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 9. 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

Value (ns)

Max

Min

Maximum Delay

Minimum Delay

66 MHz

83 MHz 100 MHz 66 MHz

83 MHz 100 MHz

sp36a sp37a FCC outputs—internal clock (NMSI)

5.5

0.5

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)

882

sp40

sp41 TDM outputs/SI

2.5

sp42

sp43 TIMER/IDMA outputs

0.5

sp42a sp43a PIO outputs

0.5

Table 10. AC Characteristics for CPM Inputs 1

Input specifications are measured from the 50% level of the signal to the 50% level of the rising edge of CLKIN.

Timings are measured at the pin.

Spec Number

Characteristic

Value (ns)

Setup

Hold

Setup

Hold

66 MHz

83 MHz 100 MHz 66 MHz

83 MHz 100 MHz

sp16a sp17a FCC inputs—internal clock (NMSI)

sp16b sp17b FCC inputs—external clock (NMSI)

2.5

sp18a sp19a SCC/SMC/SPI/I2C inputs—internal

clock (NMSI)

660

sp18b sp19b SCC/SMC/SPI/I2C inputs—external

clock (NMSI)

442

sp20

sp21 TDM inputs/SI

2.5

sp22

sp23 PIO/TIMER/IDMA inputs

0.5

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