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SN74HC595: CPD测试计算

Part Number: SN74HC595

Dear:

SN74595,器件使用条件如下:RCLK=1MHz, SRCLK=1MHz, SER=0.5MHz, duty=50%, OE=L, SRCLR=H, 请问下,计算CPD的时候,PD = Cpd * Vcc * Vcc * fi + ∑(Cl * Vcc * Vcc * fo), 芯片输入有时钟频率1Mhz, 数据0.5Mhz, 这里的fi应该是1Mhz,还是0.5MHZ ? 为什么?

感谢。