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DAC104S085: datasheet 中 TMIN ≤ TA ≤ TMAX条件不知道是什么

Part Number: DAC104S085

规格书中测试信号完整性的时候,看到有两种条件的参数,比如:

SCL的时钟频率,典型值是40MHZ,           在TMIN ≤ TA ≤ TMAX的时候,最大值为30MHz。

不懂什么情况下典型值是40MHZ,什么情况下最大值为30MHz。