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SN74AXC4T774: SN74AXC4T774

Part Number: SN74AXC4T774

为什么有的产品的ibis model中I-V曲线与V-T曲线的电压扫描范围不是按照如下规则呢?[pullup]:以电源为参考,电压扫描-VCC~2VCC;[pulldown]:以地为参考,电压扫描-VCC~2VCC;[power clamp]:以电源为参考,电压扫描-VCC~VCC;[GND clamp]:以地为参考,电压扫描-VCC~VCC。电压的扫描范围是依据什么选取呢?