參數(shù)資料
型號(hào): MPC8248ZQMIBX
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 266 MHz, RISC PROCESSOR, PBGA516
封裝: 27 X 27 MM, 2.25 MM HEIGHT, 1 MM PITCH, PLASTIC, MS-034AAL-1, BGA-516
文件頁(yè)數(shù): 7/60頁(yè)
文件大?。?/td> 918K
代理商: MPC8248ZQMIBX
MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 1.5
Freescale Semiconductor
15
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-/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
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
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
45
PCI
27
Table 9. AC Characteristics for CPM Outputs 1
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
133
MHz
66
MHz
83
MHz
100
MHz
133
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)
8
2
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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