參數(shù)資料
型號: MPC8280VVTX
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, RISC PROCESSOR, PBGA480
封裝: 37.5 X 37.5 MM, 1.55 MM, 1.27 MM PITCH, LEAD FREE, TBGA-480
文件頁數(shù): 8/83頁
文件大?。?/td> 618K
代理商: MPC8280VVTX
MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2
16
Freescale Semiconductor
AC Electrical Characteristics
6
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 MHz 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 this table.
6.1
CPM AC Characteristics
This table lists CPM output characteristics.
Table 8. Output Buffer Impedances1
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 272
2 On silicon revision 0.0 (mask #: 0K49M), selectable impedance is not available.
Impedance is set at 45
Ω.
On all other revisions, impedance value is selected through the SIUMCR[20,21]. See
the SoC reference manual.
Local bus
45
Memory controller
45 or 272
Parallel I/O
45
PCI
27
Table 9. 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
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)
6
5.5
0.5
sp36b
sp37b FCC outputs—external clock (NMSI)
8
2
sp38a
sp39a SCC/SMC/SPI/I2C outputs—internal
clock (NMSI)
10
0
sp38b
sp39b SCC/SMC/SPI/I2C outputs—external
clock (NMSI)
888
222
sp40
sp41
TDM outputs/SI
11
2.5
sp42
sp43
TIMER/IDMA outputs
11
0.5
sp42a
sp43a PIO outputs
11
0.5
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