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| 型号： | MC7448VU867NC |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 35/60页 |
| 文件大小： | 0K |
| 描述： | IC MPU RISC 32BIT 360-FCCBGA |
| 标准包装： | 44 |
| 系列： | MPC74xx |
| 处理器类型： | 32-位 MPC74xx PowerPC |
| 速度： | 867MHz |
| 电压： | 1V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 360-CBGA，FCCBGA |
| 供应商设备封装： | 360-FCCBGA（25x25） |
| 包装： | 托盘 |
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MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4
40
Freescale Semiconductor
System Design Information
9.2.3
Transient Specifications
The ensure the long-term reliability of the device, the MPC7448 requires that transients on the core power
rail (VDD) be constrained. The recommended operating voltage specifications provided in Table 4 are DC
specifications. That is, the device may be operated continuously with VDD within the specified range
without adversely affecting the device’s reliability. Excursions above the stated recommended operation
range, including overshoot during power-up, can impact the long-term reliability of the device. Excursions
are described by their amplitude and duration. Duration is defined as the time period during which the VDD
power plane, as measured at the VDD_SENSE pins, will be within a specific voltage range, expressed as
percentage of the total time the device will be powered up over the device lifetime. In practice, the period
over which transients are measured can be any arbitrary period of time that accurately represents the
expected range of processor and system activity. The voltage ranges and durations for normal operation
and transients are described in Table 14.
Note that, to simplify transient measurements, the duration of the excursion into the High Transient region
is also included in the Low Transient duration, so that only the time the voltage is above each threshold
must be considered. Figure 19 shows an example of measuring voltage transients.
Figure 19. Voltage Transient Example
Table 14. VDD Power Supply Transient Specifications
At recommended operating temperatures. See Table 4.
Voltage Region
Voltage Range (V)
Permitted
Duration 1
Notes
Min
Max
Normal
VDD minimum
VDD maximum
100%
2
Low Transient
VDD maximum
1.35 V
10%
2, 3
High Transient
1.35 V
1.40 V
0.2%
4
Notes:
1. Permitted duration is defined as the percentage of the total time the device is powered on that the VDD
power supply voltage may exist within the specified voltage range.
3. To simplify measurement, excursions into the High Transient region are included in this duration.
4. Excursions above the absolute maximum rating of 1.4 V are not permitted; see Table 2.
VDD (nominal)
1.40 V
A + B < T 10%
1.35 V
VDD (maximum)
A
C
B
T
C < T 0.2%
VDD (minimum)
Normal
Low Transient
High Transient
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