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SN74LVC1G34: SN74LVC1G34DBVR开通和关断阈值电压与规格书中描述值不一致的问题

Part Number: SN74LVC1G34

使用SN74LVC1G34DBVR,供电电压+5V,该芯片规格书中第六页描述,当VCC=4.5-5.5时,VIH的最小值是0.7VCC=0.7*5=3.5V,实测芯片2.4V就可以开通;低电平最大值0.3VCC=0.3*5=1.5V,实测2.6V就开始关断.

为什么实测值与规格书中描述的参数值差异这么大.