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SN74LVC244A: ΔIcc spec of SN74LVC244A

Part Number: SN74LVC244A

Dear,

The datasheet has two Icc information, one is Icc and another is ΔIcc, so I have some questions about ΔIcc。

1. the test condition is one input is Vcc-0.6V, so what's the mean about this input? one invalid input?

2. ΔIcc is large much than Icc, so why? and there is no any load during this test, right?

Thanks,

Antony