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| 型号： | SPEAR300-2 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 333 MHz, RISC MICROCONTROLLER, PBGA289 |
| 封装： | 15 X 15 MM, 1.70 MM HEIGHT, 0.80 MM PITCH, ROHS COMPLIANT, LFBGA-289 |
| 文件页数： | 49/83页 |
| 文件大小： | 1027K |
| 代理商： | SPEAR300-2 |
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SPEAr300
Electrical characteristics
Doc ID 16324 Rev 2
53/83
5.3
DC electrical characteristics
The recommended operating conditions are listed in the following table:
5.4
Overshoot and undershoot
This product can support the following values of overshoot and undershoot.
If the amplitude of the overshoot/undershoot increases (decreases), the ratio of
overshoot/undershoot width to the pulse width decreases (increases). The formula relating
the two is:
Amplitude of OS/US = 0.75*(1- ratio of OS (or US) duration with respect to pulse width)
Note:
The value of overshoot/undershoot should not exceed the value of 0.5 V. However, the
duration of the overshoot/undershoot can be increased by decreasing its amplitude.
3.
The maximum current and power values listed above, obtained with typical supply voltages, are not
guaranteed to be the highest obtainable. These values are dependent on many factors including the type of
applications running, clock rates, use of internal functional capabilities, external interface usage, case
temperature, and the power supply voltages. Your specific application can produce significantly different
results.
1.2 V current and power are primarily dependent on the applications running and the use of internal chip
functions (DMA, USB, Ethernet, and so on).
3.3 V current and power are primarily dependent on the capacitive loading, frequency, and utilization of the
external buses.
Table 17.
Recommended operating conditions
Symbol
Parameter
Min
Typ
Max
Unit
VDD 1.2
Supply voltage for the core
1.14
1.2
1.3
V
VDD 3.3
Supply voltage for the I/Os
3
3.3
3.6
V
VDD 2.5
Supply voltage for the analog blocks
2.25
2.5
2.75
V
VDD 1.8
Supply voltage for DRAM interface
1.70
1.8
1.9
V
VDD RTC
RTC supply voltage
1.3
1.5
1.8
V
TC
Case temperature
-40
85
°C
Table 18.
Overshoot and undershoot specifications
Parameter
3V3 I/Os
2V5 I/Os
1V8 I/Os
Amplitude
500 mV
Ratio of overshoot (or undershoot) duration with respect to
pulse width
1/3
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