参数资料
型号: MPC8248VRPIEX
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 300 MHz, RISC PROCESSOR, PBGA516
封装: 27 X 27 MM, 2.25 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, MS-034AAL-1, BGA-516
文件页数: 8/60页
文件大小: 918K
代理商: MPC8248VRPIEX
MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 1.5
16
Freescale Semiconductor
AC Electrical 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.
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.
Figure 3 shows the FCC internal clock.
Figure 3. FCC Internal Clock Diagram
Table 10. AC Characteristics for CPM Inputs 1
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
133
MHz
66
MHz
83
MHz
100
MHz
133
MHz
sp16a sp17a FCC inputs—internal clock (NMSI)
666
60000
sp16b sp17b FCC inputs—external clock (NMSI)
2.5
2222
sp18a sp19a SCC/SMC/SPI/I2C inputs—internal clock (NMSI)
666
60000
sp18b sp19b SCC/SMC/SPI/I2C inputs—external clock (NMSI)
444
42222
sp20
sp21
TDM inputs/SI
3
2.5
sp22
sp23
PIO/TIMER/IDMA inputs
8
0.5
BRG_OUT
FCC input signals
FCC output signals
Note: When GFMR.[TCI] = 1
Note: When GFMR[TCI] = 0
sp36a/sp37a
sp17a
sp16a
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