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SN74LVC240A: About VIH and VIL thresholds of voltage.

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Part Number: SN74LVC240A

Hi team.

My customer got a waveform as bellow.

VCC is 3.3V.

CH1:Out put

CH2:/OEpin

The output is Low when /OE voltage is 1.57V.

According to the data sheet, VIL is 0.8Vmax.

And then, the out put is High when /OE is 1.69V.

According to the data sheet, VIH is 2V min.

Why doesn't it match the data sheet value?

Sincerely.

Kengo.


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