MPC8271VRM datasheet(15/60 Pages) FREESCALE

15 / 60 page

MPC8272 PowerQUICC II™ Family Hardware Specifications, Rev. 1.5

Freescale Semiconductor

AC Electrical Characteristics

The following sections include illustrations and tables of clock diagrams, signals, and CPM outputs and

inputs for 66.67-/83.33-/100-/133-MHz MPC8272 devices. Note that AC timings are based on a 50-pf load

for MAX Delay and 10-pf load for MIN delay. Typical output buffer impedances are shown in Table 8.

6.1

CPM AC Characteristics

Table 9 lists CPM output characteristics.

Table 8. Output Buffer Impedances 1

These are typical values at 65° C. Impedance may vary by ±25% with process and temperature.

Output Buffers

Typical Impedance (

Ω)

60x bus

45 or 27 2

Impedance value is selected through SIUMCR[20,21]. Refer to the

MPC8280 PowerQUICC II Family Reference

Manual.

Memory controller

45 or 272

Parallel I/O

PCI

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

MHz

100

MHz

133

MHz

100

MHz

133

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)

sp40

sp41

TDM outputs/SI

2.5

sp42

sp43

TIMER/IDMA outputs

0.5

sp42a sp43a PIO outputs

0.5

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