SN74LVC1T45: Power up sequence

yf liao

Part Number: SN74LVC1T45

Hi, is there power up/down sequence requirement between VCCA and VCCB? If no, what is the data IO status during the time its corrsponding VCC is ramping up but not to a stable value?

over 6 years ago

0 Clemens Ladisch over 6 years ago

Guru 316760 points

See [FAQ] What are the power sequencing requirements for the translation device? and [FAQ] What does 'partial power down' or 'Ioff' mean in the datasheet?

When both power supplies are above 0 V but not yet stable, the output state is undefined.

0 ShreyasRao over 6 years ago in reply to Clemens Ladisch

TI__Guru 62060 points

Thanks Clemens for linking the FAQs.

YF,
If there are any other points which have been missed out in the FAQ, please let me know.

Another FAQ on the ensuring the Ioff protection on the device:
e2e.ti.com/.../788639

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SN74LVC1T45: Power up sequence