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The basic power equation which best models power consumption is given below:
PTOTAL = 0.350 + f[0.0031 ηLC + 0.0948 ηCKBF + 0.01 ηCLBF+ 0.0263 ηCKLD+
0.543 ηRAM + 0.20 ηPLL+ 0.0035 ηINP + 0.0257 ηOUTP] (mW)
Where
• ηLC is the total number of logic cells in the design
• ηCKBF = # of clock buffers
• ηCLBF = # of column clock buffers
• ηCKLD = # of loads connected to the column clock buffers
• ηRAM = # of RAM blocks
• ηPLL = # of PLLs
• ηINP is the number of input pins
• ηOUTP is the number of output pins
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VCCIO
VCC
(VCCIO -VCC)MAX
VCC
400 us
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The following requirements must be met when powering up a device (refer to )LJXUH ):
• When ramping up the power supplies keep (VCCIO -VCC)MAX ≤ 500 mV. Deviation from this
recommendation can cause permanent damage to the device.
• VCCIO must lead VCC when ramping the device.
• The power supply must be greater than or equal to 400 µs to reach VCC. Ramping to
VCC/VCCIO before reaching 400 µs can cause the device to behave improperly.
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