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SN74LVC2T45: power up sequence

Genius 14240 points
Part Number: SN74LVC2T45
Other Parts Discussed in Thread: LP2985

Hi all 

My customer has below question.

Can you comment / clarify ?

Best regards



We use a SN74LVC2T45 supplied with Vcca = 5V and Vccb = 3V. Both supply voltages come from LP2985 linear regulators, which start up more or less at the same time. However, due to variations of the Von/off thresholds of the two LP2985, one linear regulator can start slightly before the other. We therefore cannot guarantee, that Vccb is ramped up along or after Vcca.

 Could this be a problem for the SN74LVC2T45?