MPC8272 datasheet(19/61 Pages) FREESCALE

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MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 3

Freescale Semiconductor

AC Electrical Characteristics

This table 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.

NOTE

Although the specifications generally reference the rising edge of the clock,

the following AC timing diagrams also apply when the falling edge is the

active edge.

This figure shows the FCC internal clock.

Figure 3. FCC Internal Clock Diagram

Table 11. AC Characteristics for CPM Inputs1

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

MHz

100

MHz

133

MHz

100

MHz

133

MHz

sp16a sp17a FCC inputs—internal clock (NMSI)

6660000

sp16b sp17b FCC inputs—external clock (NMSI)

2.5

2222

sp18a sp19a SCC/SMC/SPI/I2C inputs—internal clock (NMSI)

6660000

sp18b sp19b SCC/SMC/SPI/I2C inputs—external clock (NMSI)

4442222

sp20

sp21

TDM inputs/SI

2.5

sp22

sp23

PIO/TIMER/IDMA inputs

0.5

BRG_OUT

FCC input signals

FCC output signals

Note: When GFMR.[TCI] = 1

Note: When GFMR[TCI] = 0

sp36a/sp37a

sp17a

sp16a

MPC8272 Datasheet(PDF) 19 Page - Freescale Semiconductor, Inc

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